diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,100 @@
+# CHANGELOG for network
+
+## Version 3.2.8.0
+
+* sockopt: add IP_DONTFRAG/IP_MTU_DISCOVER option.
+  [#603](https://github.com/haskell/network/pull/603)
+* Add new SocketOption KeepInit.
+  [#600](https://github.com/haskell/network/pull/600)
+* Remove withSocketsDo from examples.
+  [#596](https://github.com/haskell/network/pull/596)
+
+## Version 3.2.7.0
+
+* Using nested `bracket` for `gracefulClose`.
+  [#591](https://github.com/haskell/network/issues/590)
+* Fix memory leak in getaddrinfo and make it async exception safe.
+  [#591](https://github.com/haskell/network/pull/591)
+* Make call to c_free async exception safe.
+  [#592](https://github.com/haskell/network/pull/592)
+
+## Version 3.2.6.0
+
+* fixing the Show instance of IPv4-mapped IPv6 address on little endian machines
+
+## Version 3.2.5.0
+
+* `gracefulClose` based on STM racing and `timeout`.
+  [#587](https://github.com/haskell/network/issues/587)
+
+## Version 3.2.4.0
+
+* New API: setSockOptValue.
+  [#588](https://github.com/haskell/network/issues/588)
+
+## Version 3.2.3.0
+
+* Making getAddrInfo polymorphic
+  [#587](https://github.com/haskell/network/issues/587)
+
+## Version 3.2.2.0
+
+* New API: waitReadSocketSTM, waitAndCancelReadSocketSTM,
+  waitWriteSocketSTM, waitAndCancelWriteSocketSTM
+  [#586](https://github.com/haskell/network/issues/586)
+* Checking the length of ASCII string allowing trailing 0.
+  [#585](https://github.com/haskell/network/issues/585)
+
+## Version 3.2.1.0
+
+* Trying to release with the latest autoreconf.
+  Packing "network" in the local directory instead of CI.
+* Remove includes from .cabal-file
+  [#583](https://github.com/haskell/network/issues/583)
+* making gracefulClose more graceful
+  [#580](https://github.com/haskell/network/issues/580)
+* Update config.guess, config.sub to their latest versions
+  [#579](https://github.com/haskell/network/issues/579)
+
+## Version 3.2.0.0
+
+* Breaking change: Using Strict and StrictData.
+* Breaking change: Allow a control message to contain multiple file descriptors
+  [#567](https://github.com/haskell/network/issues/567)
+* Breaking change: CmsgIdFd -> CmsgIdFds
+  [#575](https://github.com/haskell/network/issues/575)
+* SocketTypes: use UnsupportedSocketType instead of -1.
+  [#560](https://github.com/haskell/network/issues/560)
+* Expose NullSockAddr, add send-with-fds functions.
+  [#562](https://github.com/haskell/network/issues/562)
+* Allow bytestring-0.12 and replace deprecated memcpy by copyBytes.
+  [#564](https://github.com/haskell/network/issues/564)
+* Close file descriptor in accept when exception happens
+  [#569](https://github.com/haskell/network/issues/569)
+* Bump CI to GHC 9.8 and latest versions of actions
+  [#573](https://github.com/haskell/network/issues/573)
+
+## Version 3.1.5.0
+
+* [#541](https://github.com/haskell/network/issues/541)
+  * Export `Network.Socket.Internal.NullSockAddr`
+  * Add `Network.Socket.ByteString.sendManyWithFds`
+  * Add `Network.Socket.ByteString.Lazy.sendWithFds`
+
+## Version 3.1.4.0
+
+* Install and use afunix_compat.h header.
+  [#556](https://github.com/haskell/network/pull/556)
+* Supporting SO_SNDTIMEO and SO_RCVTIMEO.
+  [#555](https://github.com/haskell/network/pull/555)
+* Emulating socketPair on Windows.
+  [#554](https://github.com/haskell/network/pull/554)
+
+## Version 3.1.3.0
+
+* Supporting AF_UNIX on Windows
+  [#553](https://github.com/haskell/network/issues/553)
+
 ## Version 3.1.2.9
 
 * Resolving the runtime linker problem on Windows.
diff --git a/Network/Socket.hs b/Network/Socket.hs
--- a/Network/Socket.hs
+++ b/Network/Socket.hs
@@ -3,6 +3,11 @@
 #include "HsNetDef.h"
 
 -----------------------------------------------------------------------------
+
+-----------------------------------------------------------------------------
+
+-- In order to process this file, you need to have CALLCONV defined.
+
 -- |
 -- Module      :  Network.Socket
 -- Copyright   :  (c) The University of Glasgow 2001
@@ -28,6 +33,7 @@
 -- > import qualified Control.Exception as E
 -- > import Control.Monad (unless, forever, void)
 -- > import qualified Data.ByteString as S
+-- > import qualified Data.List.NonEmpty as NE
 -- > import Network.Socket
 -- > import Network.Socket.ByteString (recv, sendAll)
 -- >
@@ -42,7 +48,7 @@
 -- >
 -- > -- from the "network-run" package.
 -- > runTCPServer :: Maybe HostName -> ServiceName -> (Socket -> IO a) -> IO a
--- > runTCPServer mhost port server = withSocketsDo $ do
+-- > runTCPServer mhost port server = do
 -- >     addr <- resolve
 -- >     E.bracket (open addr) close loop
 -- >   where
@@ -51,7 +57,7 @@
 -- >                 addrFlags = [AI_PASSIVE]
 -- >               , addrSocketType = Stream
 -- >               }
--- >         head <$> getAddrInfo (Just hints) mhost (Just port)
+-- >         NE.head <$> getAddrInfo (Just hints) mhost (Just port)
 -- >     open addr = E.bracketOnError (openSocket addr) close $ \sock -> do
 -- >         setSocketOption sock ReuseAddr 1
 -- >         withFdSocket sock setCloseOnExecIfNeeded
@@ -72,6 +78,7 @@
 -- >
 -- > import qualified Control.Exception as E
 -- > import qualified Data.ByteString.Char8 as C
+-- > import qualified Data.List.NonEmpty as NE
 -- > import Network.Socket
 -- > import Network.Socket.ByteString (recv, sendAll)
 -- >
@@ -84,13 +91,13 @@
 -- >
 -- > -- from the "network-run" package.
 -- > runTCPClient :: HostName -> ServiceName -> (Socket -> IO a) -> IO a
--- > runTCPClient host port client = withSocketsDo $ do
+-- > runTCPClient host port client = do
 -- >     addr <- resolve
 -- >     E.bracket (open addr) close client
 -- >   where
 -- >     resolve = do
 -- >         let hints = defaultHints { addrSocketType = Stream }
--- >         head <$> getAddrInfo (Just hints) (Just host) (Just port)
+-- >         NE.head <$> getAddrInfo (Just hints) (Just host) (Just port)
 -- >     open addr = E.bracketOnError (openSocket addr) close $ \sock -> do
 -- >         connect sock $ addrAddress addr
 -- >         return sock
@@ -100,170 +107,305 @@
 -- unexpected things would happen. There is one exception for multiple
 -- threads vs a single 'Socket': one thread reads data from a 'Socket'
 -- only and the other thread writes data to the 'Socket' only.
------------------------------------------------------------------------------
-
--- In order to process this file, you need to have CALLCONV defined.
-
-module Network.Socket
-    (
-    -- * Initialisation
-      withSocketsDo
-
+module Network.Socket (
     -- * Address information
-    , getAddrInfo
+    getAddrInfo,
+
     -- ** Types
-    , HostName
-    , ServiceName
-    , AddrInfo(..)
-    , defaultHints
+    HostName,
+    ServiceName,
+    AddrInfo (..),
+    defaultHints,
+
     -- ** Flags
-    , AddrInfoFlag(..)
-    , addrInfoFlagImplemented
+    AddrInfoFlag (..),
+    addrInfoFlagImplemented,
 
     -- * Socket operations
-    , connect
-    , bind
-    , listen
-    , accept
+    connect,
+    bind,
+    listen,
+    accept,
+
     -- ** Closing
-    , close
-    , close'
-    , gracefulClose
-    , shutdown
-    , ShutdownCmd(..)
+    close,
+    close',
+    gracefulClose,
+    shutdown,
+    ShutdownCmd (..),
 
     -- * Socket options
-    , SocketOption(SockOpt
-                  ,UnsupportedSocketOption
-                  ,Debug,ReuseAddr,SoDomain,Type,SoProtocol,SoError,DontRoute
-                  ,Broadcast,SendBuffer,RecvBuffer,KeepAlive,OOBInline
-                  ,TimeToLive,MaxSegment,NoDelay,Cork,Linger,ReusePort
-                  ,RecvLowWater,SendLowWater,RecvTimeOut,SendTimeOut
-                  ,UseLoopBack,UserTimeout,IPv6Only
-                  ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo
-                  ,RecvIPv6HopLimit,RecvIPv6TClass,RecvIPv6PktInfo)
-    , StructLinger (..)
-    , isSupportedSocketOption
-    , whenSupported
-    , getSocketOption
-    , setSocketOption
-    , getSockOpt
-    , setSockOpt
+    SocketOption (
+        SockOpt,
+        UnsupportedSocketOption,
+        Debug,
+        ReuseAddr,
+        SoDomain,
+        Type,
+        SoProtocol,
+        SoError,
+        DontRoute,
+        Broadcast,
+        SendBuffer,
+        RecvBuffer,
+        KeepAlive,
+        KeepInit,
+        OOBInline,
+        TimeToLive,
+        MaxSegment,
+        NoDelay,
+        Cork,
+        Linger,
+        ReusePort,
+        RecvLowWater,
+        SendLowWater,
+        RecvTimeOut,
+        SendTimeOut,
+        UseLoopBack,
+        UserTimeout,
+        IPv6Only,
+        RecvIPv4TTL,
+        RecvIPv4TOS,
+        RecvIPv4PktInfo,
+        DontFragment,
+        RecvIPv6HopLimit,
+        RecvIPv6TClass,
+        RecvIPv6PktInfo
+    ),
+    isSupportedSocketOption,
+    whenSupported,
+    getSocketOption,
+    setSocketOption,
 
+    -- ** General socket options
+    StructLinger (..),
+    SocketTimeout (..),
+    getSockOpt,
+    setSockOpt,
+
+    -- ** Integrated socket options
+    SockOptValue (..),
+    setSockOptValue,
+
     -- * Socket
-    , Socket
-    , socket
-    , openSocket
-    , withFdSocket
-    , unsafeFdSocket
-    , touchSocket
-    , socketToFd
-    , fdSocket
-    , mkSocket
-    , socketToHandle
+    Socket,
+    socket,
+    openSocket,
+    withFdSocket,
+    unsafeFdSocket,
+    touchSocket,
+    socketToFd,
+    fdSocket,
+    mkSocket,
+    socketToHandle,
+
     -- ** Types of Socket
-    , SocketType(GeneralSocketType, UnsupportedSocketType, NoSocketType
-                , Stream, Datagram, Raw, RDM, SeqPacket)
-    , isSupportedSocketType
-    , getSocketType
+    SocketType (
+        GeneralSocketType,
+        UnsupportedSocketType,
+        NoSocketType,
+        Stream,
+        Datagram,
+        Raw,
+        RDM,
+        SeqPacket
+    ),
+    isSupportedSocketType,
+    getSocketType,
+
     -- ** Family
-    , Family(GeneralFamily, UnsupportedFamily
-            ,AF_UNSPEC,AF_UNIX,AF_INET,AF_INET6,AF_IMPLINK,AF_PUP,AF_CHAOS
-            ,AF_NS,AF_NBS,AF_ECMA,AF_DATAKIT,AF_CCITT,AF_SNA,AF_DECnet
-            ,AF_DLI,AF_LAT,AF_HYLINK,AF_APPLETALK,AF_ROUTE,AF_NETBIOS
-            ,AF_NIT,AF_802,AF_ISO,AF_OSI,AF_NETMAN,AF_X25,AF_AX25,AF_OSINET
-            ,AF_GOSSIP,AF_IPX,Pseudo_AF_XTP,AF_CTF,AF_WAN,AF_SDL,AF_NETWARE
-            ,AF_NDD,AF_INTF,AF_COIP,AF_CNT,Pseudo_AF_RTIP,Pseudo_AF_PIP
-            ,AF_SIP,AF_ISDN,Pseudo_AF_KEY,AF_NATM,AF_ARP,Pseudo_AF_HDRCMPLT
-            ,AF_ENCAP,AF_LINK,AF_RAW,AF_RIF,AF_NETROM,AF_BRIDGE,AF_ATMPVC
-            ,AF_ROSE,AF_NETBEUI,AF_SECURITY,AF_PACKET,AF_ASH,AF_ECONET
-            ,AF_ATMSVC,AF_IRDA,AF_PPPOX,AF_WANPIPE,AF_BLUETOOTH,AF_CAN)
-    , isSupportedFamily
-    , packFamily
-    , unpackFamily
+    Family (
+        GeneralFamily,
+        UnsupportedFamily,
+        AF_UNSPEC,
+        AF_UNIX,
+        AF_INET,
+        AF_INET6,
+        AF_IMPLINK,
+        AF_PUP,
+        AF_CHAOS,
+        AF_NS,
+        AF_NBS,
+        AF_ECMA,
+        AF_DATAKIT,
+        AF_CCITT,
+        AF_SNA,
+        AF_DECnet,
+        AF_DLI,
+        AF_LAT,
+        AF_HYLINK,
+        AF_APPLETALK,
+        AF_ROUTE,
+        AF_NETBIOS,
+        AF_NIT,
+        AF_802,
+        AF_ISO,
+        AF_OSI,
+        AF_NETMAN,
+        AF_X25,
+        AF_AX25,
+        AF_OSINET,
+        AF_GOSSIP,
+        AF_IPX,
+        Pseudo_AF_XTP,
+        AF_CTF,
+        AF_WAN,
+        AF_SDL,
+        AF_NETWARE,
+        AF_NDD,
+        AF_INTF,
+        AF_COIP,
+        AF_CNT,
+        Pseudo_AF_RTIP,
+        Pseudo_AF_PIP,
+        AF_SIP,
+        AF_ISDN,
+        Pseudo_AF_KEY,
+        AF_NATM,
+        AF_ARP,
+        Pseudo_AF_HDRCMPLT,
+        AF_ENCAP,
+        AF_LINK,
+        AF_RAW,
+        AF_RIF,
+        AF_NETROM,
+        AF_BRIDGE,
+        AF_ATMPVC,
+        AF_ROSE,
+        AF_NETBEUI,
+        AF_SECURITY,
+        AF_PACKET,
+        AF_ASH,
+        AF_ECONET,
+        AF_ATMSVC,
+        AF_IRDA,
+        AF_PPPOX,
+        AF_WANPIPE,
+        AF_BLUETOOTH,
+        AF_CAN
+    ),
+    isSupportedFamily,
+    packFamily,
+    unpackFamily,
+
     -- ** Protocol number
-    , ProtocolNumber
-    , defaultProtocol
+    ProtocolNumber,
+    defaultProtocol,
+
     -- * Basic socket address type
-    , SockAddr(..)
-    , isSupportedSockAddr
-    , getPeerName
-    , getSocketName
+    SockAddr (..),
+    isSupportedSockAddr,
+    getPeerName,
+    getSocketName,
+
     -- ** Host address
-    , HostAddress
-    , hostAddressToTuple
-    , tupleToHostAddress
+    HostAddress,
+    hostAddressToTuple,
+    tupleToHostAddress,
+
     -- ** Host address6
-    , HostAddress6
-    , hostAddress6ToTuple
-    , tupleToHostAddress6
+    HostAddress6,
+    hostAddress6ToTuple,
+    tupleToHostAddress6,
+
     -- ** Flow Info
-    , FlowInfo
+    FlowInfo,
+
     -- ** Scope ID
-    , ScopeID
-    , ifNameToIndex
-    , ifIndexToName
+    ScopeID,
+    ifNameToIndex,
+    ifIndexToName,
+
     -- ** Port number
-    , PortNumber
-    , defaultPort
-    , socketPortSafe
-    , socketPort
+    PortNumber,
+    defaultPort,
+    socketPortSafe,
+    socketPort,
 
     -- * UNIX-domain socket
-    , isUnixDomainSocketAvailable
-    , socketPair
-    , sendFd
-    , recvFd
-    , getPeerCredential
+    isUnixDomainSocketAvailable,
+    socketPair,
+    sendFd,
+    recvFd,
+    getPeerCredential,
 
     -- * Name information
-    , getNameInfo
-    , NameInfoFlag(..)
+    getNameInfo,
+    NameInfoFlag (..),
 
     -- * Low level
+
     -- ** socket operations
-    , setCloseOnExecIfNeeded
-    , getCloseOnExec
-    , setNonBlockIfNeeded
-    , getNonBlock
+    setCloseOnExecIfNeeded,
+    getCloseOnExec,
+    setNonBlockIfNeeded,
+    getNonBlock,
+
     -- ** Sending and receiving data
-    , sendBuf
-    , recvBuf
-    , sendBufTo
-    , recvBufFrom
+    sendBuf,
+    recvBuf,
+    sendBufTo,
+    recvBufFrom,
+
     -- ** Advanced IO
-    , sendBufMsg
-    , recvBufMsg
-    , MsgFlag(MSG_OOB,MSG_DONTROUTE,MSG_PEEK,MSG_EOR,MSG_TRUNC,MSG_CTRUNC,MSG_WAITALL)
+    sendBufMsg,
+    recvBufMsg,
+    MsgFlag (
+        MSG_OOB,
+        MSG_DONTROUTE,
+        MSG_PEEK,
+        MSG_EOR,
+        MSG_TRUNC,
+        MSG_CTRUNC,
+        MSG_WAITALL
+    ),
+
     -- ** Control message (ancillary data)
-    , Cmsg(..)
-    , CmsgId(CmsgId
-            ,CmsgIdIPv4TTL
-            ,CmsgIdIPv6HopLimit
-            ,CmsgIdIPv4TOS
-            ,CmsgIdIPv6TClass
-            ,CmsgIdIPv4PktInfo
-            ,CmsgIdIPv6PktInfo
-            ,CmsgIdFd
-            ,UnsupportedCmsgId)
+    Cmsg (..),
+    CmsgId (
+        CmsgId,
+        CmsgIdIPv4TTL,
+        CmsgIdIPv6HopLimit,
+        CmsgIdIPv4TOS,
+        CmsgIdIPv6TClass,
+        CmsgIdIPv4PktInfo,
+        CmsgIdIPv6PktInfo,
+        CmsgIdFds,
+        UnsupportedCmsgId
+    ),
+
     -- ** APIs for control message
-    , lookupCmsg
-    , filterCmsg
-    , decodeCmsg
-    , encodeCmsg
+    lookupCmsg,
+    filterCmsg,
+
     -- ** Class and types for control message
-    , ControlMessage(..)
-    , IPv4TTL(..)
-    , IPv6HopLimit(..)
-    , IPv4TOS(..)
-    , IPv6TClass(..)
-    , IPv4PktInfo(..)
-    , IPv6PktInfo(..)
+    ControlMessage (..),
+    IPv4TTL (..),
+    IPv6HopLimit (..),
+    IPv4TOS (..),
+    IPv6TClass (..),
+    IPv4PktInfo (..),
+    IPv6PktInfo (..),
+
     -- * Special constants
-    , maxListenQueue
-    ) where
+    maxListenQueue,
 
-import Network.Socket.Buffer hiding (sendBufTo, recvBufFrom, sendBufMsg, recvBufMsg)
+    -- * STM to check read and write
+    waitReadSocketSTM,
+    waitAndCancelReadSocketSTM,
+    waitWriteSocketSTM,
+    waitAndCancelWriteSocketSTM,
+
+    -- * Deprecated
+    withSocketsDo,
+) where
+
+import Network.Socket.Buffer hiding (
+    recvBufFrom,
+    recvBufMsg,
+    sendBufMsg,
+    sendBufTo,
+ )
 import Network.Socket.Cbits
 import Network.Socket.Fcntl
 import Network.Socket.Flag
@@ -273,9 +415,10 @@
 import Network.Socket.Internal
 import Network.Socket.Name hiding (getPeerName, getSocketName)
 import Network.Socket.Options
+import Network.Socket.STM
 import Network.Socket.Shutdown
 import Network.Socket.SockAddr
-import Network.Socket.Syscall hiding (connect, bind, accept)
+import Network.Socket.Syscall hiding (accept, bind, connect)
 import Network.Socket.Types
 import Network.Socket.Unix
 #if !defined(mingw32_HOST_OS)
diff --git a/Network/Socket/Address.hs b/Network/Socket/Address.hs
--- a/Network/Socket/Address.hs
+++ b/Network/Socket/Address.hs
@@ -1,28 +1,31 @@
 -- | This module provides extensible APIs for socket addresses.
---
 module Network.Socket.Address (
     -- * Socket Address
-      SocketAddress(..)
-    , getPeerName
-    , getSocketName
+    SocketAddress (..),
+    getPeerName,
+    getSocketName,
+
     -- * Socket operations
-    , connect
-    , bind
-    , accept
+    connect,
+    bind,
+    accept,
+
     -- * Sending and receiving ByteString
-    , sendTo
-    , sendAllTo
-    , recvFrom
+    sendTo,
+    sendAllTo,
+    recvFrom,
+
     -- * Sending and receiving data from a buffer
-    , sendBufTo
-    , recvBufFrom
+    sendBufTo,
+    recvBufFrom,
+
     -- * Advanced IO
-    , sendBufMsg
-    , recvBufMsg
-    ) where
+    sendBufMsg,
+    recvBufMsg,
+) where
 
-import Network.Socket.ByteString.IO
 import Network.Socket.Buffer
+import Network.Socket.ByteString.IO
 import Network.Socket.Name
 import Network.Socket.Syscall
 import Network.Socket.Types
diff --git a/Network/Socket/ByteString.hs b/Network/Socket/ByteString.hs
--- a/Network/Socket/ByteString.hs
+++ b/Network/Socket/ByteString.hs
@@ -16,36 +16,36 @@
 --
 -- > import Network.Socket
 -- > import Network.Socket.ByteString
---
-module Network.Socket.ByteString
-    (
+module Network.Socket.ByteString (
     -- * Send data to a socket
-      send
-    , sendAll
-    , sendTo
-    , sendAllTo
+    send,
+    sendAll,
+    sendTo,
+    sendAllTo,
 
     -- ** Vectored I/O
     -- $vectored
-    , sendMany
-    , sendManyTo
+    sendMany,
+    sendManyTo,
+    sendManyWithFds,
 
     -- * Receive data from a socket
-    , recv
-    , recvFrom
+    recv,
+    recvFrom,
 
     -- * Advanced send and recv
-    , sendMsg
-    , recvMsg
-    ) where
+    sendMsg,
+    recvMsg,
+) where
 
 import Data.ByteString (ByteString)
 
+import Network.Socket.ByteString.IO hiding (recvFrom, sendAllTo, sendTo)
 import qualified Network.Socket.ByteString.IO as G
-import Network.Socket.ByteString.IO hiding (sendTo, sendAllTo, recvFrom)
 import Network.Socket.Types
 
 -- ----------------------------------------------------------------------------
+
 -- ** Vectored I/O
 
 -- $vectored
diff --git a/Network/Socket/ByteString/IO.hsc b/Network/Socket/ByteString/IO.hsc
--- a/Network/Socket/ByteString/IO.hsc
+++ b/Network/Socket/ByteString/IO.hsc
@@ -1,4 +1,3 @@
-{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE OverloadedStrings #-}
 
@@ -25,6 +24,7 @@
     -- $vectored
     , sendMany
     , sendManyTo
+    , sendManyWithFds
 
     -- * Receive data from a socket
     , recv
@@ -54,6 +54,7 @@
 import Foreign.ForeignPtr (withForeignPtr)
 import Foreign.Marshal.Utils (with)
 import Network.Socket.Internal
+import System.Posix.Types (Fd(..))
 
 import Network.Socket.Flag
 
@@ -218,6 +219,21 @@
                   peek send_ptr
 #endif
 
+-- | Send data and file descriptors over a UNIX-domain socket in
+--   a single system call. This function does not work on Windows.
+sendManyWithFds :: Socket       -- ^ Socket
+                -> [ByteString] -- ^ Data to send
+                -> [Fd]         -- ^ File descriptors
+                -> IO ()
+sendManyWithFds s bss fds =
+    void $
+        withBufSizs bss $ \bufsizs ->
+            sendBufMsg s addr bufsizs cmsgs flags
+  where
+    addr = NullSockAddr
+    cmsgs = encodeCmsg . (:[]) <$> fds
+    flags = mempty
+
 -- ----------------------------------------------------------------------------
 -- Receiving
 
@@ -232,6 +248,11 @@
 --
 -- For TCP sockets, a zero length return value means the peer has
 -- closed its half side of the connection.
+--
+-- Currently, the 'recv' family is blocked on Windows because a proper
+-- IO manager is not implemented. To use with 'System.Timeout.timeout'
+-- on Windows, use 'Network.Socket.setSocketOption' with
+-- 'Network.Socket.RecvTimeOut' as well.
 recv :: Socket        -- ^ Connected socket
      -> Int            -- ^ Maximum number of bytes to receive
      -> IO ByteString  -- ^ Data received
@@ -289,9 +310,9 @@
 withBufSizs :: [ByteString] -> ([(Ptr Word8, Int)] -> IO a) -> IO a
 withBufSizs bss0 f = loop bss0 id
   where
-    loop []                    !build = f $ build []
-    loop (PS fptr off len:bss) !build = withForeignPtr fptr $ \ptr -> do
-        let !ptr' = ptr `plusPtr` off
+    loop []                    build = f $ build []
+    loop (PS fptr off len:bss) build = withForeignPtr fptr $ \ptr -> do
+        let ptr' = ptr `plusPtr` off
         loop bss (build . ((ptr',len) :))
 
 -- | Send data to the socket using sendmsg(2).
diff --git a/Network/Socket/ByteString/Lazy.hs b/Network/Socket/ByteString/Lazy.hs
--- a/Network/Socket/ByteString/Lazy.hs
+++ b/Network/Socket/ByteString/Lazy.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+
 -- |
 -- Module      : Network.Socket.ByteString.Lazy
 -- Copyright   : (c) Bryan O'Sullivan 2009
@@ -18,21 +19,26 @@
 -- > import Network.Socket
 -- > import Network.Socket.ByteString.Lazy
 -- > import Prelude hiding (getContents)
---
 module Network.Socket.ByteString.Lazy (
     -- * Send data to a socket
-    send
-  , sendAll
+    send,
+    sendAll,
+    sendWithFds,
+
     -- * Receive data from a socket
-  , getContents
-  , recv
-  ) where
+    getContents,
+    recv,
+) where
 
-import           Data.ByteString.Lazy.Internal (ByteString(..), defaultChunkSize)
-import           Network.Socket                (ShutdownCmd (..), shutdown)
-import           Prelude                       hiding (getContents)
-import           System.IO.Unsafe              (unsafeInterleaveIO)
-import           System.IO.Error               (catchIOError)
+import Data.ByteString.Lazy.Internal (
+    ByteString (..),
+    defaultChunkSize,
+ )
+import Network.Socket (ShutdownCmd (..), shutdown)
+import System.IO.Error (catchIOError)
+import System.IO.Unsafe (unsafeInterleaveIO)
+import System.Posix.Types (Fd (..))
+import Prelude hiding (getContents)
 
 #if defined(mingw32_HOST_OS)
 import Network.Socket.ByteString.Lazy.Windows  (send, sendAll)
@@ -40,13 +46,27 @@
 import Network.Socket.ByteString.Lazy.Posix    (send, sendAll)
 #endif
 
-import qualified Data.ByteString               as S
-import qualified Network.Socket.ByteString     as N
-import           Network.Socket.Imports
-import           Network.Socket.Types
+import qualified Data.ByteString as S
+import qualified Data.ByteString.Lazy as L
+import qualified Network.Socket.ByteString as N
+import Network.Socket.Imports
+import Network.Socket.Types
 
+-- | Send data and file descriptors over a UNIX-domain socket in
+--   a single system call. This function does not work on Windows.
+sendWithFds
+    :: Socket
+    -- ^ Socket
+    -> ByteString
+    -- ^ Data to send
+    -> [Fd]
+    -- ^ File descriptors
+    -> IO ()
+sendWithFds s lbs fds = N.sendManyWithFds s (L.toChunks lbs) fds
+
 -- -----------------------------------------------------------------------------
 -- Receiving
+
 -- | Receive data from the socket.  The socket must be in a connected
 -- state.  Data is received on demand, in chunks; each chunk will be
 -- sized to reflect the amount of data received by individual 'recv'
@@ -57,16 +77,18 @@
 -- down.  If there is an error and an exception is thrown, the socket
 -- is not shut down.
 getContents
-    :: Socket -- ^ Connected socket
-    -> IO ByteString -- ^ Data received
+    :: Socket
+    -- ^ Connected socket
+    -> IO ByteString
+    -- ^ Data received
 getContents s = loop
   where
     loop = unsafeInterleaveIO $ do
         sbs <- N.recv s defaultChunkSize
         if S.null sbs
             then do
-              shutdown s ShutdownReceive `catchIOError` const (return ())
-              return Empty
+                shutdown s ShutdownReceive `catchIOError` const (return ())
+                return Empty
             else Chunk sbs <$> loop
 
 -- | Receive data from the socket.  The socket must be in a connected
@@ -77,10 +99,14 @@
 --
 -- If there is no more data to be received, returns an empty 'ByteString'.
 recv
-    :: Socket -- ^ Connected socket
-    -> Int64 -- ^ Maximum number of bytes to receive
-    -> IO ByteString -- ^ Data received
+    :: Socket
+    -- ^ Connected socket
+    -> Int64
+    -- ^ Maximum number of bytes to receive
+    -> IO ByteString
+    -- ^ Data received
 recv s nbytes = chunk <$> N.recv s (fromIntegral nbytes)
   where
-    chunk k | S.null k  = Empty
-            | otherwise = Chunk k Empty
+    chunk k
+        | S.null k = Empty
+        | otherwise = Chunk k Empty
diff --git a/Network/Socket/ByteString/Lazy/Posix.hs b/Network/Socket/ByteString/Lazy/Posix.hs
--- a/Network/Socket/ByteString/Lazy/Posix.hs
+++ b/Network/Socket/ByteString/Lazy/Posix.hs
@@ -1,54 +1,59 @@
-{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Network.Socket.ByteString.Lazy.Posix (
     -- * Send data to a socket
-    send
-  , sendAll
-  ) where
+    send,
+    sendAll,
+) where
 
-import qualified Data.ByteString.Lazy               as L
-import           Data.ByteString.Unsafe             (unsafeUseAsCStringLen)
-import           Foreign.Marshal.Array              (allocaArray)
+import qualified Data.ByteString.Lazy as L
+import Data.ByteString.Unsafe (unsafeUseAsCStringLen)
+import Foreign.Marshal.Array (allocaArray)
 
-import           Network.Socket.ByteString.IO       (waitWhen0)
-import           Network.Socket.ByteString.Internal (c_writev)
-import           Network.Socket.Imports
-import           Network.Socket.Internal
-import           Network.Socket.Posix.IOVec    (IOVec (IOVec))
-import           Network.Socket.Types
+import Network.Socket.ByteString.IO (waitWhen0)
+import Network.Socket.ByteString.Internal (c_writev)
+import Network.Socket.Imports
+import Network.Socket.Internal
+import Network.Socket.Posix.IOVec (IOVec (IOVec))
+import Network.Socket.Types
 
 -- -----------------------------------------------------------------------------
 -- Sending
 send
-    :: Socket -- ^ Connected socket
-    -> L.ByteString -- ^ Data to send
-    -> IO Int64 -- ^ Number of bytes sent
+    :: Socket
+    -- ^ Connected socket
+    -> L.ByteString
+    -- ^ Data to send
+    -> IO Int64
+    -- ^ Number of bytes sent
 send s lbs = do
-    let cs  = take maxNumChunks (L.toChunks lbs)
+    let cs = take maxNumChunks (L.toChunks lbs)
         len = length cs
     siz <- withFdSocket s $ \fd -> allocaArray len $ \ptr ->
-             withPokes cs ptr $ \niovs ->
-               throwSocketErrorWaitWrite s "writev" $ c_writev fd ptr niovs
+        withPokes cs ptr $ \niovs ->
+            throwSocketErrorWaitWrite s "writev" $ c_writev fd ptr niovs
     return $ fromIntegral siz
   where
     withPokes ss p f = loop ss p 0 0
       where
-        loop (c:cs) q k !niovs
+        loop (c : cs) q k niovs
             | k < maxNumBytes = unsafeUseAsCStringLen c $ \(ptr, len) -> do
                 poke q $ IOVec (castPtr ptr) (fromIntegral len)
-                loop cs
-                     (q `plusPtr` sizeOf (IOVec nullPtr 0))
-                     (k + fromIntegral len)
-                     (niovs + 1)
+                loop
+                    cs
+                    (q `plusPtr` sizeOf (IOVec nullPtr 0))
+                    (k + fromIntegral len)
+                    (niovs + 1)
             | otherwise = f niovs
         loop _ _ _ niovs = f niovs
-    maxNumBytes  = 4194304 :: Int -- maximum number of bytes to transmit in one system call
+    maxNumBytes = 4194304 :: Int -- maximum number of bytes to transmit in one system call
     maxNumChunks = 1024 :: Int -- maximum number of chunks to transmit in one system call
 
 sendAll
-    :: Socket -- ^ Connected socket
-    -> L.ByteString -- ^ Data to send
+    :: Socket
+    -- ^ Connected socket
+    -> L.ByteString
+    -- ^ Data to send
     -> IO ()
 sendAll _ "" = return ()
 sendAll s bs0 = loop bs0
diff --git a/Network/Socket/ByteString/Lazy/Windows.hs b/Network/Socket/ByteString/Lazy/Windows.hs
--- a/Network/Socket/ByteString/Lazy/Windows.hs
+++ b/Network/Socket/ByteString/Lazy/Windows.hs
@@ -2,31 +2,36 @@
 
 module Network.Socket.ByteString.Lazy.Windows (
     -- * Send data to a socket
-    send
-  , sendAll
-  ) where
+    send,
+    sendAll,
+) where
 
-import qualified Data.ByteString           as S
-import qualified Data.ByteString.Lazy      as L
+import qualified Data.ByteString as S
+import qualified Data.ByteString.Lazy as L
 import qualified Network.Socket.ByteString as Socket
-import           Network.Socket.Imports
-import           Network.Socket.ByteString.IO       (waitWhen0)
-import           Network.Socket.Types
+import Network.Socket.ByteString.IO (waitWhen0)
+import Network.Socket.Imports
+import Network.Socket.Types
 
 -- -----------------------------------------------------------------------------
 -- Sending
 send
-    :: Socket -- ^ Connected socket
-    -> L.ByteString -- ^ Data to send
-    -> IO Int64 -- ^ Number of bytes sent
+    :: Socket
+    -- ^ Connected socket
+    -> L.ByteString
+    -- ^ Data to send
+    -> IO Int64
+    -- ^ Number of bytes sent
 send s lbs = case L.toChunks lbs of
     -- TODO: Consider doing nothing if the string is empty.
-    []    -> fromIntegral <$> Socket.send s S.empty
-    (x:_) -> fromIntegral <$> Socket.send s x
+    [] -> fromIntegral <$> Socket.send s S.empty
+    (x : _) -> fromIntegral <$> Socket.send s x
 
 sendAll
-    :: Socket -- ^ Connected socket
-    -> L.ByteString -- ^ Data to send
+    :: Socket
+    -- ^ Connected socket
+    -> L.ByteString
+    -- ^ Data to send
     -> IO ()
 sendAll _ "" = return ()
 sendAll s bs0 = loop bs0
diff --git a/Network/Socket/Handle.hs b/Network/Socket/Handle.hs
--- a/Network/Socket/Handle.hs
+++ b/Network/Socket/Handle.hs
@@ -1,8 +1,8 @@
 module Network.Socket.Handle where
 
-import qualified GHC.IO.Device (IODeviceType(Stream))
+import qualified GHC.IO.Device (IODeviceType (Stream))
 import GHC.IO.Handle.FD (fdToHandle')
-import System.IO (IOMode(..), Handle, BufferMode(..), hSetBuffering)
+import System.IO (BufferMode (..), Handle, IOMode (..), hSetBuffering)
 
 import Network.Socket.Types
 
@@ -15,14 +15,13 @@
 -- close the 'Socket' after 'socketToHandle', call 'System.IO.hClose'
 -- on the 'Handle'.
 --
--- Caveat 'Handle' is not recommended for network programming in 
+-- Caveat 'Handle' is not recommended for network programming in
 -- Haskell, e.g. merely performing 'hClose' on a TCP socket won't
 -- cooperate with peer's 'gracefulClose', i.e. proper shutdown
 -- sequence with appropriate handshakes specified by the protocol.
-
 socketToHandle :: Socket -> IOMode -> IO Handle
 socketToHandle s mode = invalidateSocket s err $ \oldfd -> do
-    h <- fdToHandle' oldfd (Just GHC.IO.Device.Stream) True (show s) mode True{-bin-}
+    h <- fdToHandle' oldfd (Just GHC.IO.Device.Stream) True (show s) mode True {-bin-}
     hSetBuffering h NoBuffering
     return h
   where
diff --git a/Network/Socket/Imports.hs b/Network/Socket/Imports.hs
--- a/Network/Socket/Imports.hs
+++ b/Network/Socket/Imports.hs
@@ -1,19 +1,19 @@
 module Network.Socket.Imports (
-    module Control.Applicative
-  , module Control.Monad
-  , module Data.Bits
-  , module Data.Int
-  , module Data.List
-  , module Data.Maybe
-  , module Data.Monoid
-  , module Data.Ord
-  , module Data.Word
-  , module Foreign.C.String
-  , module Foreign.C.Types
-  , module Foreign.Ptr
-  , module Foreign.Storable
-  , module Numeric
-  ) where
+    module Control.Applicative,
+    module Control.Monad,
+    module Data.Bits,
+    module Data.Int,
+    module Data.List,
+    module Data.Maybe,
+    module Data.Monoid,
+    module Data.Ord,
+    module Data.Word,
+    module Foreign.C.String,
+    module Foreign.C.Types,
+    module Foreign.Ptr,
+    module Foreign.Storable,
+    module Numeric,
+) where
 
 import Control.Applicative
 import Control.Monad
diff --git a/Network/Socket/Info.hsc b/Network/Socket/Info.hsc
--- a/Network/Socket/Info.hsc
+++ b/Network/Socket/Info.hsc
@@ -7,6 +7,9 @@
 
 module Network.Socket.Info where
 
+import Control.Exception (mask, onException)
+import Data.List.NonEmpty (NonEmpty(..))
+import qualified Data.List.NonEmpty as NE
 import Foreign.Marshal.Alloc (alloca, allocaBytes)
 import Foreign.Marshal.Utils (maybeWith, with)
 import GHC.IO.Exception (IOErrorType(NoSuchThing))
@@ -108,8 +111,8 @@
   } deriving (Eq, Show)
 
 instance Storable AddrInfo where
-    sizeOf    _ = #const sizeof(struct addrinfo)
-    alignment _ = alignment (0 :: CInt)
+    sizeOf    ~_ = #const sizeof(struct addrinfo)
+    alignment ~_ = alignment (0 :: CInt)
 
     peek p = do
         ai_flags <- (#peek struct addrinfo, ai_flags) p
@@ -200,70 +203,85 @@
   , addrCanonName  = Nothing
   }
 
------------------------------------------------------------------------------
--- | Resolve a host or service name to one or more addresses.
--- The 'AddrInfo' values that this function returns contain 'SockAddr'
--- values that you can pass directly to 'connect' or
--- 'bind'.
---
--- This function is protocol independent.  It can return both IPv4 and
--- IPv6 address information.
---
--- The 'AddrInfo' argument specifies the preferred query behaviour,
--- socket options, or protocol.  You can override these conveniently
--- using Haskell's record update syntax on 'defaultHints', for example
--- as follows:
---
--- >>> let hints = defaultHints { addrFlags = [AI_NUMERICHOST], addrSocketType = Stream }
---
--- You must provide a 'Just' value for at least one of the 'HostName'
--- or 'ServiceName' arguments.  'HostName' can be either a numeric
--- network address (dotted quad for IPv4, colon-separated hex for
--- IPv6) or a hostname.  In the latter case, its addresses will be
--- looked up unless 'AI_NUMERICHOST' is specified as a hint.  If you
--- do not provide a 'HostName' value /and/ do not set 'AI_PASSIVE' as
--- a hint, network addresses in the result will contain the address of
--- the loopback interface.
---
--- If the query fails, this function throws an IO exception instead of
--- returning an empty list.  Otherwise, it returns a non-empty list
--- of 'AddrInfo' values.
---
--- There are several reasons why a query might result in several
--- values.  For example, the queried-for host could be multihomed, or
--- the service might be available via several protocols.
---
--- Note: the order of arguments is slightly different to that defined
--- for @getaddrinfo@ in RFC 2553.  The 'AddrInfo' parameter comes first
--- to make partial application easier.
---
--- >>> addr:_ <- getAddrInfo (Just hints) (Just "127.0.0.1") (Just "http")
--- >>> addrAddress addr
--- 127.0.0.1:80
+class GetAddrInfo t where
+    -----------------------------------------------------------------------------
+    -- | Resolve a host or service name to one or more addresses.
+    -- The 'AddrInfo' values that this function returns contain 'SockAddr'
+    -- values that you can pass directly to 'connect' or
+    -- 'bind'.
+    --
+    -- This function calls @getaddrinfo(3)@, which never successfully returns
+    -- with an empty list. If the query fails, 'getAddrInfo' throws an IO
+    -- exception.
+    --
+    -- For backwards-compatibility reasons, a hidden 'GetAddrInfo' class is used
+    -- to make the result polymorphic. It only has instances for @[]@ (lists)
+    -- and 'NonEmpty'. Use of 'NonEmpty' is recommended.
+    --
+    -- This function is protocol independent.  It can return both IPv4 and
+    -- IPv6 address information.
+    --
+    -- The 'AddrInfo' argument specifies the preferred query behaviour,
+    -- socket options, or protocol.  You can override these conveniently
+    -- using Haskell's record update syntax on 'defaultHints', for example
+    -- as follows:
+    --
+    -- >>> let hints = defaultHints { addrFlags = [AI_NUMERICHOST], addrSocketType = Stream }
+    --
+    -- You must provide a 'Just' value for at least one of the 'HostName'
+    -- or 'ServiceName' arguments.  'HostName' can be either a numeric
+    -- network address (dotted quad for IPv4, colon-separated hex for
+    -- IPv6) or a hostname.  In the latter case, its addresses will be
+    -- looked up unless 'AI_NUMERICHOST' is specified as a hint.  If you
+    -- do not provide a 'HostName' value /and/ do not set 'AI_PASSIVE' as
+    -- a hint, network addresses in the result will contain the address of
+    -- the loopback interface.
+    --
+    -- There are several reasons why a query might result in several
+    -- values.  For example, the queried-for host could be multihomed, or
+    -- the service might be available via several protocols.
+    --
+    -- Note: the order of arguments is slightly different to that defined
+    -- for @getaddrinfo@ in RFC 2553.  The 'AddrInfo' parameter comes first
+    -- to make partial application easier.
+    --
+    -- >>> import qualified Data.List.NonEmpty as NE
+    -- >>> addr <- NE.head <$> getAddrInfo (Just hints) (Just "127.0.0.1") (Just "http")
+    -- >>> addrAddress addr
+    -- 127.0.0.1:80
+    --
+    -- Polymorphic version: @since 3.2.3.0
+    getAddrInfo
+        :: Maybe AddrInfo -- ^ preferred socket type or protocol
+        -> Maybe HostName -- ^ host name to look up
+        -> Maybe ServiceName -- ^ service name to look up
+        -> IO (t AddrInfo) -- ^ resolved addresses, with "best" first
 
-getAddrInfo
+instance GetAddrInfo [] where
+    getAddrInfo = getAddrInfoList
+
+instance GetAddrInfo NE.NonEmpty where
+    getAddrInfo = getAddrInfoNE
+
+getAddrInfoNE
     :: Maybe AddrInfo -- ^ preferred socket type or protocol
     -> Maybe HostName -- ^ host name to look up
     -> Maybe ServiceName -- ^ service name to look up
-    -> IO [AddrInfo] -- ^ resolved addresses, with "best" first
-getAddrInfo hints node service = alloc getaddrinfo
+    -> IO (NonEmpty AddrInfo) -- ^ resolved addresses, with "best" first
+getAddrInfoNE hints node service = alloc getaddrinfo
   where
     alloc body = withSocketsDo $ maybeWith withCString node $ \c_node ->
         maybeWith withCString service                       $ \c_service ->
             maybeWith with filteredHints                    $ \c_hints ->
                   alloca                                    $ \ptr_ptr_addrs ->
                       body c_node c_service c_hints ptr_ptr_addrs
-    getaddrinfo c_node c_service c_hints ptr_ptr_addrs = do
+    getaddrinfo c_node c_service c_hints ptr_ptr_addrs = mask $ \release -> do
         ret <- c_getaddrinfo c_node c_service c_hints ptr_ptr_addrs
         if ret == 0 then do
             ptr_addrs <- peek ptr_ptr_addrs
-            ais       <- followAddrInfo ptr_addrs
+            ais       <- release (followAddrInfo ptr_addrs) `onException` c_freeaddrinfo ptr_addrs
             c_freeaddrinfo ptr_addrs
-            -- POSIX requires that getaddrinfo(3) returns at least one addrinfo.
-            -- See: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getaddrinfo.html
-            case ais of
-              [] -> ioError $ mkIOError NoSuchThing message Nothing Nothing
-              _ -> return ais
+            return ais
           else do
             err <- gai_strerror ret
             ioError $ ioeSetErrorString
@@ -273,9 +291,9 @@
         "Network.Socket.getAddrInfo (called with preferred socket type/protocol: "
       , maybe "Nothing" show hints
       , ", host name: "
-      , show node
+      , maybe "Nothing" show node
       , ", service name: "
-      , show service
+      , maybe "Nothing" show service
       , ")"
       ]
 #if defined(darwin_HOST_OS)
@@ -290,13 +308,33 @@
     filteredHints = hints
 #endif
 
-followAddrInfo :: Ptr AddrInfo -> IO [AddrInfo]
+getAddrInfoList
+    :: Maybe AddrInfo
+    -> Maybe HostName
+    -> Maybe ServiceName
+    -> IO [AddrInfo]
+getAddrInfoList hints node service =
+    -- getAddrInfo never returns an empty list.
+    NE.toList <$> getAddrInfoNE hints node service
+
+followAddrInfo :: Ptr AddrInfo -> IO (NonEmpty AddrInfo)
 followAddrInfo ptr_ai
-    | ptr_ai == nullPtr = return []
+    -- POSIX requires that getaddrinfo(3) returns at least one addrinfo.
+    -- See: http://pubs.opengroup.org/onlinepubs/9699919799/functions/getaddrinfo.html
+    | ptr_ai == nullPtr = ioError $ mkIOError NoSuchThing "getaddrinfo must return at least one addrinfo" Nothing Nothing
     | otherwise = do
-        a  <- peek ptr_ai
-        as <- (# peek struct addrinfo, ai_next) ptr_ai >>= followAddrInfo
-        return (a : as)
+        a <- peek ptr_ai
+        ptr <- (# peek struct addrinfo, ai_next) ptr_ai
+        (a :|) <$> go ptr
+  where
+    go :: Ptr AddrInfo -> IO [AddrInfo]
+    go ptr
+      | ptr == nullPtr = return []
+      | otherwise = do
+            a' <- peek ptr
+            ptr' <- (# peek struct addrinfo, ai_next) ptr
+            as' <- go ptr'
+            return (a':as')
 
 foreign import ccall safe "hsnet_getaddrinfo"
     c_getaddrinfo :: CString -> CString -> Ptr AddrInfo -> Ptr (Ptr AddrInfo)
@@ -412,12 +450,12 @@
 -----------------------------------------------------------------------------
 -- SockAddr
 
+-- |
+--
+-- >>> SockAddrInet6 80 0 (0,0,0xffff,0x01020304) 0
+-- [::ffff:1.2.3.4]:80
 instance Show SockAddr where
-#if defined(DOMAIN_SOCKET_SUPPORT)
   showsPrec _ (SockAddrUnix str) = showString str
-#else
-  showsPrec _ SockAddrUnix{} = error "showsPrec: not supported"
-#endif
   showsPrec _ (SockAddrInet port ha)
    = showHostAddress ha
    . showString ":"
@@ -435,6 +473,11 @@
   let (u3, u2, u1, u0) = hostAddressToTuple ip in
   foldr1 (.) . intersperse (showChar '.') $ map showInt [u3, u2, u1, u0]
 
+showHostAddress' :: HostAddress -> ShowS
+showHostAddress' ip =
+  let (u3, u2, u1, u0) = hostAddressToTuple' ip in
+  foldr1 (.) . intersperse (showChar '.') $ map showInt [u3, u2, u1, u0]
+
 -- Taken from showIPv6 in Data.IP.Addr.
 
 -- | Show an IPv6 address in the most appropriate notation, based on recommended
@@ -446,10 +489,10 @@
 showHostAddress6 ha6@(a1, a2, a3, a4)
     -- IPv4-Mapped IPv6 Address
     | a1 == 0 && a2 == 0 && a3 == 0xffff =
-      showString "::ffff:" . showHostAddress a4
+      showString "::ffff:" . showHostAddress' a4
     -- IPv4-Compatible IPv6 Address (exclude IPRange ::/112)
     | a1 == 0 && a2 == 0 && a3 == 0 && a4 >= 0x10000 =
-        showString "::" . showHostAddress a4
+        showString "::" . showHostAddress' a4
     -- length of longest run > 1, replace it with "::"
     | end - begin > 1 =
         showFields prefix . showString "::" . showFields suffix
diff --git a/Network/Socket/Internal.hs b/Network/Socket/Internal.hs
--- a/Network/Socket/Internal.hs
+++ b/Network/Socket/Internal.hs
@@ -48,6 +48,9 @@
     -- * Initialization
     , withSocketsDo
 
+    -- * Null socket address type
+    , NullSockAddr (..)
+
     -- * Low-level helpers
     , zeroMemory
     ) where
diff --git a/Network/Socket/Options.hsc b/Network/Socket/Options.hsc
--- a/Network/Socket/Options.hsc
+++ b/Network/Socket/Options.hsc
@@ -3,6 +3,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE GADTs #-}
 
 #include "HsNet.h"
 ##include "HsNetDef.h"
@@ -11,11 +12,11 @@
     SocketOption(SockOpt
                 ,UnsupportedSocketOption
                 ,AcceptConn,Debug,ReuseAddr,SoDomain,Type,SoProtocol,SoError
-                ,DontRoute,Broadcast,SendBuffer,RecvBuffer,KeepAlive,OOBInline
-                ,TimeToLive,MaxSegment,NoDelay,Cork,Linger,ReusePort
+                ,DontRoute,Broadcast,SendBuffer,RecvBuffer,KeepAlive,KeepInit
+                ,OOBInline,TimeToLive,MaxSegment,NoDelay,Cork,Linger,ReusePort
                 ,RecvLowWater,SendLowWater,RecvTimeOut,SendTimeOut
                 ,UseLoopBack,UserTimeout,IPv6Only
-                ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo
+                ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo,DontFragment
                 ,RecvIPv6HopLimit,RecvIPv6TClass,RecvIPv6PktInfo
                 ,CustomSockOpt)
   , isSupportedSocketOption
@@ -25,7 +26,10 @@
   , setSocketOption
   , getSockOpt
   , setSockOpt
+  , SockOptValue (..)
+  , setSockOptValue
   , StructLinger (..)
+  , SocketTimeout (..)
   ) where
 
 import qualified Text.Read as P
@@ -38,7 +42,9 @@
 import Network.Socket.Types
 import Network.Socket.ReadShow
 
------------------------------------------------------------------------------
+#include <sys/time.h>
+
+----------------------------------------------------------------
 -- Socket Properties
 
 -- | Socket options for use with 'setSocketOption' and 'getSocketOption'.
@@ -47,26 +53,85 @@
 -- is supported on your system: see 'isSupportedSocketOption'
 data SocketOption = SockOpt
 #if __GLASGOW_HASKELL__ >= 806
-    !CInt -- ^ Option Level
-    !CInt -- ^ Option Name
+    CInt -- ^ Option Level
+    CInt -- ^ Option Name
 #else
-    !CInt -- Option Level
-    !CInt -- Option Name
+    CInt -- Option Level
+    CInt -- Option Name
 #endif
   deriving (Eq)
 
+----------------------------------------------------------------
+
+socketOptionBijection :: Bijection SocketOption String
+socketOptionBijection =
+    [ (UnsupportedSocketOption, "UnsupportedSocketOption")
+    , (Debug, "Debug")
+    , (ReuseAddr, "ReuseAddr")
+    , (SoDomain, "SoDomain")
+    , (Type, "Type")
+    , (SoProtocol, "SoProtocol")
+    , (SoError, "SoError")
+    , (DontRoute, "DontRoute")
+    , (Broadcast, "Broadcast")
+    , (SendBuffer, "SendBuffer")
+    , (RecvBuffer, "RecvBuffer")
+    , (KeepAlive, "KeepAlive")
+    , (KeepInit, "KeepInit")
+    , (OOBInline, "OOBInline")
+    , (Linger, "Linger")
+    , (ReusePort, "ReusePort")
+    , (RecvLowWater, "RecvLowWater")
+    , (SendLowWater, "SendLowWater")
+    , (RecvTimeOut, "RecvTimeOut")
+    , (SendTimeOut, "SendTimeOut")
+    , (UseLoopBack, "UseLoopBack")
+    , (MaxSegment, "MaxSegment")
+    , (NoDelay, "NoDelay")
+    , (UserTimeout, "UserTimeout")
+    , (Cork, "Cork")
+    , (TimeToLive, "TimeToLive")
+    , (RecvIPv4TTL, "RecvIPv4TTL")
+    , (RecvIPv4TOS, "RecvIPv4TOS")
+    , (RecvIPv4PktInfo, "RecvIPv4PktInfo")
+    , (DontFragment, "DontFragment")
+    , (IPv6Only, "IPv6Only")
+    , (RecvIPv6HopLimit, "RecvIPv6HopLimit")
+    , (RecvIPv6TClass, "RecvIPv6TClass")
+    , (RecvIPv6PktInfo, "RecvIPv6PktInfo")
+    ]
+
+instance Show SocketOption where
+    showsPrec = bijectiveShow socketOptionBijection def
+      where
+        defname = "SockOpt"
+        unwrap = \(CustomSockOpt nm) -> nm
+        def = defShow defname unwrap showIntInt
+
+
+instance Read SocketOption where
+    readPrec = bijectiveRead socketOptionBijection def
+      where
+        defname = "SockOpt"
+        def = defRead defname CustomSockOpt readIntInt
+
+----------------------------------------------------------------
+
+pattern UnsupportedSocketOption :: SocketOption
+pattern UnsupportedSocketOption = SockOpt (-1) (-1)
+
 -- | Does the 'SocketOption' exist on this system?
 isSupportedSocketOption :: SocketOption -> Bool
 isSupportedSocketOption opt = opt /= SockOpt (-1) (-1)
 
--- | Get the 'SocketType' of an active socket.
---
---   Since: 3.0.1.0
-getSocketType :: Socket -> IO SocketType
-getSocketType s = unpackSocketType <$> getSockOpt s Type
+-- | Execute the given action only when the specified socket option is
+--  supported. Any return value is ignored.
+whenSupported :: SocketOption -> IO a -> IO ()
+whenSupported s action
+  | isSupportedSocketOption s = action >> return ()
+  | otherwise                 = return ()
 
-pattern UnsupportedSocketOption :: SocketOption
-pattern UnsupportedSocketOption = SockOpt (-1) (-1)
+----------------------------------------------------------------
 
 #ifdef SOL_SOCKET
 -- | SO_ACCEPTCONN, read-only
@@ -157,6 +222,15 @@
 #else
 pattern KeepAlive      = SockOpt (-1) (-1)
 #endif
+-- | TCP_KEEPINIT
+pattern KeepInit :: SocketOption
+#ifdef TCP_KEEPINIT
+pattern KeepInit       = SockOpt (#const IPPROTO_TCP) (#const TCP_KEEPINIT)
+#elif defined(TCP_CONNECTIONTIMEOUT)
+pattern KeepInit       = SockOpt (#const IPPROTO_TCP) (#const TCP_CONNECTIONTIMEOUT)
+#else
+pattern KeepInit       = SockOpt (-1) (-1)
+#endif
 -- | SO_OOBINLINE
 pattern OOBInline :: SocketOption
 #ifdef SO_OOBINLINE
@@ -192,14 +266,16 @@
 #else
 pattern SendLowWater   = SockOpt (-1) (-1)
 #endif
--- | SO_RCVTIMEO: this does not work at this moment.
+-- | SO_RCVTIMEO: timeout in microseconds. This option is not useful
+-- in the normal case where sockets are non-blocking.
 pattern RecvTimeOut :: SocketOption
 #ifdef SO_RCVTIMEO
 pattern RecvTimeOut    = SockOpt (#const SOL_SOCKET) (#const SO_RCVTIMEO)
 #else
 pattern RecvTimeOut    = SockOpt (-1) (-1)
 #endif
--- | SO_SNDTIMEO: this does not work at this moment.
+-- | SO_SNDTIMEO: timeout in microseconds. This option is not useful
+-- in the normal case where sockets are non-blocking.
 pattern SendTimeOut :: SocketOption
 #ifdef SO_SNDTIMEO
 pattern SendTimeOut    = SockOpt (#const SOL_SOCKET) (#const SO_SNDTIMEO)
@@ -277,6 +353,15 @@
 #else
 pattern RecvIPv4PktInfo  = SockOpt (-1) (-1)
 #endif
+-- | IP_DONTFRAG
+pattern DontFragment :: SocketOption
+#if HAVE_DECL_IP_DONTFRAG
+pattern DontFragment   = SockOpt (#const IPPROTO_IP) (#const IP_DONTFRAG)
+#elif HAVE_DECL_IP_MTU_DISCOVER
+pattern DontFragment   = SockOpt (#const IPPROTO_IP) (#const IP_MTU_DISCOVER)
+#else
+pattern DontFragment   = SockOpt (-1) (-1)
+#endif
 #endif // HAVE_DECL_IPPROTO_IP
 
 #if HAVE_DECL_IPPROTO_IPV6
@@ -317,41 +402,7 @@
   where
     CustomSockOpt (x, y) = SockOpt x y
 
-#if __GLASGOW_HASKELL__ >= 806
-{-# COMPLETE CustomSockOpt #-}
-#endif
-#ifdef SO_LINGER
--- | Low level 'SO_LINBER' option value, which can be used with 'setSockOpt'.
---
-data StructLinger = StructLinger {
-    -- | Set the linger option on.
-    sl_onoff  :: CInt,
-
-    -- | Linger timeout.
-    sl_linger :: CInt
-  }
-  deriving (Eq, Ord, Show)
-
-instance Storable StructLinger where
-    sizeOf    _ = (#const sizeof(struct linger))
-    alignment _ = alignment (0 :: CInt)
-
-    peek p = do
-        onoff  <- (#peek struct linger, l_onoff) p
-        linger <- (#peek struct linger, l_linger) p
-        return $ StructLinger onoff linger
-
-    poke p (StructLinger onoff linger) = do
-        (#poke struct linger, l_onoff)  p onoff
-        (#poke struct linger, l_linger) p linger
-#endif
-
--- | Execute the given action only when the specified socket option is
---  supported. Any return value is ignored.
-whenSupported :: SocketOption -> IO a -> IO ()
-whenSupported s action
-  | isSupportedSocketOption s = action >> return ()
-  | otherwise                 = return ()
+----------------------------------------------------------------
 
 -- | Set a socket option that expects an 'Int' value.
 setSocketOption :: Socket
@@ -363,6 +414,8 @@
     let arg = if v == 0 then StructLinger 0 0 else StructLinger 1 (fromIntegral v)
     setSockOpt s so arg
 #endif
+setSocketOption s so@RecvTimeOut v = setSockOpt s so $ SocketTimeout $ fromIntegral v
+setSocketOption s so@SendTimeOut v = setSockOpt s so $ SocketTimeout $ fromIntegral v
 setSocketOption s sa v = setSockOpt s sa (fromIntegral v :: CInt)
 
 -- | Set a socket option.
@@ -378,6 +431,24 @@
           throwSocketErrorIfMinus1_ "Network.Socket.setSockOpt" $
           c_setsockopt fd level opt ptr sz
 
+-- | Set a socket option value
+--
+-- The existential 'SockOptValue' enables things like:
+--
+-- @
+-- mapM_ (uncurry $ 'setSockOptValue' sock) [
+--       ('NoDelay', 'SockOptValue' @Int 1)
+--     , ('Linger', 'SockOptValue' ('StructLinger' 1 0))
+--     ]
+-- @
+setSockOptValue :: Socket
+                     -> SocketOption
+                     -> SockOptValue
+                     -> IO ()
+setSockOptValue s opt (SockOptValue v) = setSockOpt s opt v
+
+----------------------------------------------------------------
+
 -- | Get a socket option that gives an 'Int' value.
 getSocketOption :: Socket
                 -> SocketOption  -- Option Name
@@ -387,6 +458,12 @@
     StructLinger onoff linger <- getSockOpt s so
     return $ fromIntegral $ if onoff == 0 then 0 else linger
 #endif
+getSocketOption s so@RecvTimeOut = do
+    SocketTimeout to <- getSockOpt s so
+    return $ fromIntegral to
+getSocketOption s so@SendTimeOut = do
+    SocketTimeout to <- getSockOpt s so
+    return $ fromIntegral to
 getSocketOption s so = do
     n :: CInt <- getSockOpt s so
     return $ fromIntegral n
@@ -404,56 +481,82 @@
                 c_getsockopt fd level opt ptr ptr_sz
         peek ptr
 
+----------------------------------------------------------------
 
-socketOptionBijection :: Bijection SocketOption String
-socketOptionBijection =
-    [ (UnsupportedSocketOption, "UnsupportedSocketOption")
-    , (Debug, "Debug")
-    , (ReuseAddr, "ReuseAddr")
-    , (SoDomain, "SoDomain")
-    , (Type, "Type")
-    , (SoProtocol, "SoProtocol")
-    , (SoError, "SoError")
-    , (DontRoute, "DontRoute")
-    , (Broadcast, "Broadcast")
-    , (SendBuffer, "SendBuffer")
-    , (RecvBuffer, "RecvBuffer")
-    , (KeepAlive, "KeepAlive")
-    , (OOBInline, "OOBInline")
-    , (Linger, "Linger")
-    , (ReusePort, "ReusePort")
-    , (RecvLowWater, "RecvLowWater")
-    , (SendLowWater, "SendLowWater")
-    , (RecvTimeOut, "RecvTimeOut")
-    , (SendTimeOut, "SendTimeOut")
-    , (UseLoopBack, "UseLoopBack")
-    , (MaxSegment, "MaxSegment")
-    , (NoDelay, "NoDelay")
-    , (UserTimeout, "UserTimeout")
-    , (Cork, "Cork")
-    , (TimeToLive, "TimeToLive")
-    , (RecvIPv4TTL, "RecvIPv4TTL")
-    , (RecvIPv4TOS, "RecvIPv4TOS")
-    , (RecvIPv4PktInfo, "RecvIPv4PktInfo")
-    , (IPv6Only, "IPv6Only")
-    , (RecvIPv6HopLimit, "RecvIPv6HopLimit")
-    , (RecvIPv6TClass, "RecvIPv6TClass")
-    , (RecvIPv6PktInfo, "RecvIPv6PktInfo")
-    ]
+-- | Get the 'SocketType' of an active socket.
+--
+--   Since: 3.0.1.0
+getSocketType :: Socket -> IO SocketType
+getSocketType s = unpackSocketType <$> getSockOpt s Type
 
-instance Show SocketOption where
-    showsPrec = bijectiveShow socketOptionBijection def
-      where
-        defname = "SockOpt"
-        unwrap = \(CustomSockOpt nm) -> nm
-        def = defShow defname unwrap showIntInt
+----------------------------------------------------------------
 
+#if __GLASGOW_HASKELL__ >= 806
+{-# COMPLETE CustomSockOpt #-}
+#endif
+#ifdef SO_LINGER
+-- | Low level @SO_LINGER@ option value, which can be used with 'setSockOpt' or
+-- @'setSockOptValue' . 'SockOptValue'@.
+data StructLinger = StructLinger {
+    -- | Set the linger option on.
+    sl_onoff  :: CInt,
 
-instance Read SocketOption where
-    readPrec = bijectiveRead socketOptionBijection def
-      where
-        defname = "SockOpt"
-        def = defRead defname CustomSockOpt readIntInt
+    -- | Linger timeout.
+    sl_linger :: CInt
+  }
+  deriving (Eq, Ord, Show)
+
+instance Storable StructLinger where
+    sizeOf    ~_ = (#const sizeof(struct linger))
+    alignment ~_ = alignment (0 :: CInt)
+
+    peek p = do
+        onoff  <- (#peek struct linger, l_onoff) p
+        linger <- (#peek struct linger, l_linger) p
+        return $ StructLinger onoff linger
+
+    poke p (StructLinger onoff linger) = do
+        (#poke struct linger, l_onoff)  p onoff
+        (#poke struct linger, l_linger) p linger
+#endif
+
+-- | A type that can hold any 'Storable' socket option value (e.g.
+-- 'StructLinger' and 'CInt')
+--
+-- See 'setSocOptValue'
+data SockOptValue where
+  SockOptValue :: Storable a => a -> SockOptValue
+
+----------------------------------------------------------------
+
+-- | Timeout in microseconds.
+--   This will be converted into struct timeval on Unix and
+--   DWORD (as milliseconds) on Windows.
+newtype SocketTimeout = SocketTimeout Word32 deriving (Eq, Ord, Show)
+
+#if defined(mingw32_HOST_OS)
+instance Storable SocketTimeout where
+    sizeOf ~(SocketTimeout to) = sizeOf to -- DWORD as milliseconds
+    alignment ~_ = 0
+    peek ptr    = do
+        to <- peek (castPtr ptr)
+        return $ SocketTimeout (to * 1000)
+    poke ptr (SocketTimeout to) = poke (castPtr ptr) (to `div` 1000)
+#else
+instance Storable SocketTimeout where
+    sizeOf    ~_ = (#size struct timeval)
+    alignment ~_ = (#const offsetof(struct {char x__; struct timeval (y__); }, y__))
+    peek ptr    = do
+            sec  <- (#peek struct timeval, tv_sec)  ptr
+            usec <- (#peek struct timeval, tv_usec) ptr
+            return $ SocketTimeout (sec * 1000000 + usec)
+    poke ptr (SocketTimeout to) = do
+            let (sec, usec) = to `divMod` 1000000
+            (#poke struct timeval, tv_sec)  ptr sec
+            (#poke struct timeval, tv_usec) ptr usec
+#endif
+
+----------------------------------------------------------------
 
 foreign import CALLCONV unsafe "getsockopt"
   c_getsockopt :: CInt -> CInt -> CInt -> Ptr a -> Ptr CInt -> IO CInt
diff --git a/Network/Socket/Posix/Cmsg.hsc b/Network/Socket/Posix/Cmsg.hsc
--- a/Network/Socket/Posix/Cmsg.hsc
+++ b/Network/Socket/Posix/Cmsg.hsc
@@ -1,5 +1,6 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RecordWildCards #-}
@@ -15,6 +16,7 @@
 
 import Data.ByteString.Internal
 import Foreign.ForeignPtr
+import Foreign.Marshal.Array (peekArray, pokeArray)
 import System.IO.Unsafe (unsafeDupablePerformIO)
 import System.Posix.Types (Fd(..))
 
@@ -26,16 +28,16 @@
 
 -- | Control message (ancillary data) including a pair of level and type.
 data Cmsg = Cmsg {
-    cmsgId   :: !CmsgId
-  , cmsgData :: !ByteString
+    cmsgId   :: CmsgId
+  , cmsgData :: ByteString
   } deriving (Eq, Show)
 
 ----------------------------------------------------------------
 
 -- | Identifier of control message (ancillary data).
 data CmsgId = CmsgId {
-    cmsgLevel :: !CInt
-  , cmsgType  :: !CInt
+    cmsgLevel :: CInt
+  , cmsgType  :: CInt
   } deriving (Eq)
 
 -- | Unsupported identifier
@@ -82,9 +84,9 @@
 pattern CmsgIdIPv6PktInfo = CmsgId (-1) (-1)
 #endif
 
--- | The identifier for 'Fd'.
-pattern CmsgIdFd :: CmsgId
-pattern CmsgIdFd = CmsgId (#const SOL_SOCKET) (#const SCM_RIGHTS)
+-- | The identifier for 'Fds'.
+pattern CmsgIdFds :: CmsgId
+pattern CmsgIdFds = CmsgId (#const SOL_SOCKET) (#const SCM_RIGHTS)
 
 ----------------------------------------------------------------
 
@@ -102,13 +104,15 @@
 ----------------------------------------------------------------
 
 -- | Control message type class.
---   Each control message type has a numeric 'CmsgId' and a 'Storable'
---   data representation.
-class Storable a => ControlMessage a where
+--   Each control message type has a numeric 'CmsgId' and encode
+--   and decode functions.
+class ControlMessage a where
     controlMessageId :: CmsgId
+    encodeCmsg :: a -> Cmsg
+    decodeCmsg :: Cmsg -> Maybe a
 
-encodeCmsg :: forall a . ControlMessage a => a -> Cmsg
-encodeCmsg x = unsafeDupablePerformIO $ do
+encodeStorableCmsg :: forall a . (ControlMessage a, Storable a) => a -> Cmsg
+encodeStorableCmsg x = unsafeDupablePerformIO $ do
     bs <- create siz $ \p0 -> do
         let p = castPtr p0
         poke p x
@@ -117,8 +121,8 @@
   where
     siz = sizeOf x
 
-decodeCmsg :: forall a . (ControlMessage a, Storable a) => Cmsg -> Maybe a
-decodeCmsg (Cmsg cmsid (PS fptr off len))
+decodeStorableCmsg :: forall a . (ControlMessage a, Storable a) => Cmsg -> Maybe a
+decodeStorableCmsg (Cmsg cmsid (PS fptr off len))
   | cid /= cmsid = Nothing
   | len < siz    = Nothing
   | otherwise    = unsafeDupablePerformIO $ withForeignPtr fptr $ \p0 -> do
@@ -139,6 +143,8 @@
 
 instance ControlMessage IPv4TTL where
     controlMessageId = CmsgIdIPv4TTL
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -147,6 +153,8 @@
 
 instance ControlMessage IPv6HopLimit where
     controlMessageId = CmsgIdIPv6HopLimit
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -155,6 +163,8 @@
 
 instance ControlMessage IPv4TOS where
     controlMessageId = CmsgIdIPv4TOS
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -163,6 +173,8 @@
 
 instance ControlMessage IPv6TClass where
     controlMessageId = CmsgIdIPv6TClass
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -174,11 +186,13 @@
 
 instance ControlMessage IPv4PktInfo where
     controlMessageId = CmsgIdIPv4PktInfo
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 instance Storable IPv4PktInfo where
 #if defined (IP_PKTINFO)
-    sizeOf    _ = (#size struct in_pktinfo)
-    alignment _ = alignment (0 :: CInt)
+    sizeOf    ~_ = (#size struct in_pktinfo)
+    alignment ~_ = alignment (0 :: CInt)
     poke p (IPv4PktInfo n sa ha) = do
         (#poke struct in_pktinfo, ipi_ifindex)  p (fromIntegral n :: CInt)
         (#poke struct in_pktinfo, ipi_spec_dst) p sa
@@ -189,8 +203,8 @@
         ha <- (#peek struct in_pktinfo, ipi_addr)     p
         return $ IPv4PktInfo n sa ha
 #else
-    sizeOf    _ = 0
-    alignment _ = 1
+    sizeOf    ~_ = 0
+    alignment ~_ = 1
     poke _ _ = error "Unsupported control message type"
     peek _   = error "Unsupported control message type"
 #endif
@@ -205,11 +219,13 @@
 
 instance ControlMessage IPv6PktInfo where
     controlMessageId = CmsgIdIPv6PktInfo
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 instance Storable IPv6PktInfo where
 #if defined (IPV6_PKTINFO)
-    sizeOf    _ = (#size struct in6_pktinfo)
-    alignment _ = alignment (0 :: CInt)
+    sizeOf    ~_ = (#size struct in6_pktinfo)
+    alignment ~_ = alignment (0 :: CInt)
     poke p (IPv6PktInfo n ha6) = do
         (#poke struct in6_pktinfo, ipi6_ifindex) p (fromIntegral n :: CInt)
         (#poke struct in6_pktinfo, ipi6_addr)    p (In6Addr ha6)
@@ -218,17 +234,35 @@
         n :: CInt   <- (#peek struct in6_pktinfo, ipi6_ifindex) p
         return $ IPv6PktInfo (fromIntegral n) ha6
 #else
-    sizeOf    _ = 0
-    alignment _ = 1
+    sizeOf    ~_ = 0
+    alignment ~_ = 1
     poke _ _ = error "Unsupported control message type"
     peek _   = error "Unsupported control message type"
 #endif
 
 ----------------------------------------------------------------
 
-instance ControlMessage Fd where
-    controlMessageId = CmsgIdFd
+instance ControlMessage [Fd] where
+    controlMessageId = CmsgIdFds
 
+    encodeCmsg fds = unsafeDupablePerformIO $ do
+        bs <- create siz $ \p0 -> do
+            let p = castPtr p0
+            pokeArray p fds
+        return $ Cmsg CmsgIdFds bs
+        where
+            siz = sizeOf (undefined :: Fd) * length fds
+
+    decodeCmsg (Cmsg cmsid (PS fptr off len))
+        | cmsid /= CmsgIdFds = Nothing
+        | otherwise          =
+            unsafeDupablePerformIO $ withForeignPtr fptr $ \p0 -> do
+                let p = castPtr (p0 `plusPtr` off)
+                    numFds = len `div` sizeOfFd
+                Just <$> peekArray numFds p
+        where
+            sizeOfFd = sizeOf (undefined :: Fd)
+
 cmsgIdBijection :: Bijection CmsgId String
 cmsgIdBijection =
     [ (UnsupportedCmsgId, "UnsupportedCmsgId")
@@ -238,7 +272,7 @@
     , (CmsgIdIPv6TClass, "CmsgIdIPv6TClass")
     , (CmsgIdIPv4PktInfo, "CmsgIdIPv4PktInfo")
     , (CmsgIdIPv6PktInfo, "CmsgIdIPv6PktInfo")
-    , (CmsgIdFd, "CmsgIdFd")
+    , (CmsgIdFds, "CmsgIdFds")
     ]
 
 instance Show CmsgId where
diff --git a/Network/Socket/Posix/CmsgHdr.hsc b/Network/Socket/Posix/CmsgHdr.hsc
--- a/Network/Socket/Posix/CmsgHdr.hsc
+++ b/Network/Socket/Posix/CmsgHdr.hsc
@@ -11,8 +11,9 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 
-import Foreign.Marshal.Alloc (allocaBytes)
 import Foreign.ForeignPtr
+import Foreign.Marshal.Alloc (allocaBytes)
+import Foreign.Marshal.Utils (copyBytes)
 import qualified Data.ByteString as B
 import Data.ByteString.Internal
 
@@ -23,17 +24,17 @@
 
 data CmsgHdr = CmsgHdr {
 #ifdef __linux__
-    cmsgHdrLen   :: !CSize
+    cmsgHdrLen   :: CSize
 #else
-    cmsgHdrLen   :: !(#type socklen_t)
+    cmsgHdrLen   :: #type socklen_t
 #endif
-  , cmsgHdrLevel :: !CInt
-  , cmsgHdrType  :: !CInt
+  , cmsgHdrLevel :: CInt
+  , cmsgHdrType  :: CInt
   } deriving (Eq, Show)
 
 instance Storable CmsgHdr where
-  sizeOf    _ = (#size struct cmsghdr)
-  alignment _ = alignment (0 :: CInt)
+  sizeOf    ~_ = (#size struct cmsghdr)
+  alignment ~_ = alignment (0 :: CInt)
 
   peek p = do
     len <- (#peek struct cmsghdr, cmsg_len)   p
@@ -69,7 +70,7 @@
     withForeignPtr fptr $ \src0 -> do
         let src = src0 `plusPtr` off
         dst <- c_cmsg_data ctrlPtr
-        memcpy dst src len
+        copyBytes dst src len
 
 parseCmsgs :: SocketAddress sa => Ptr (MsgHdr sa) -> IO [Cmsg]
 parseCmsgs msgptr = do
@@ -88,7 +89,7 @@
     CmsgHdr len lvl typ <- peek ptr
     src <- c_cmsg_data ptr
     let siz = fromIntegral len - (src `minusPtr` ptr)
-    Cmsg (CmsgId lvl typ) <$> create (fromIntegral siz) (\dst -> memcpy dst src siz)
+    Cmsg (CmsgId lvl typ) <$> create (fromIntegral siz) (\dst -> copyBytes dst src siz)
 
 foreign import ccall unsafe "cmsg_firsthdr"
   c_cmsg_firsthdr :: Ptr (MsgHdr sa) -> IO (Ptr CmsgHdr)
diff --git a/Network/Socket/Posix/IOVec.hsc b/Network/Socket/Posix/IOVec.hsc
--- a/Network/Socket/Posix/IOVec.hsc
+++ b/Network/Socket/Posix/IOVec.hsc
@@ -14,13 +14,13 @@
 #include <sys/uio.h>
 
 data IOVec = IOVec
-    { iovBase :: !(Ptr Word8)
-    , iovLen  :: !CSize
+    { iovBase :: Ptr Word8
+    , iovLen  :: CSize
     }
 
 instance Storable IOVec where
-  sizeOf    _ = (#const sizeof(struct iovec))
-  alignment _ = alignment (0 :: CInt)
+  sizeOf    ~_ = (#const sizeof(struct iovec))
+  alignment ~_ = alignment (0 :: CInt)
 
   peek p = do
     base <- (#peek struct iovec, iov_base) p
diff --git a/Network/Socket/Posix/MsgHdr.hsc b/Network/Socket/Posix/MsgHdr.hsc
--- a/Network/Socket/Posix/MsgHdr.hsc
+++ b/Network/Socket/Posix/MsgHdr.hsc
@@ -14,26 +14,26 @@
 import Network.Socket.Posix.IOVec (IOVec)
 
 data MsgHdr sa = MsgHdr
-    { msgName    :: !(Ptr sa)
-    , msgNameLen :: !(#type socklen_t)
-    , msgIov     :: !(Ptr IOVec)
+    { msgName    :: Ptr sa
+    , msgNameLen :: #type socklen_t
+    , msgIov     :: Ptr IOVec
 #ifdef __linux__
-    , msgIovLen  :: !CSize
+    , msgIovLen  :: CSize
 #else
-    , msgIovLen  :: !CInt
+    , msgIovLen  :: CInt
 #endif
-    , msgCtrl    :: !(Ptr Word8)
+    , msgCtrl    :: Ptr Word8
 #ifdef __linux__
-    , msgCtrlLen :: !CSize
+    , msgCtrlLen :: CSize
 #else
-    , msgCtrlLen :: !(#type socklen_t)
+    , msgCtrlLen :: #type socklen_t
 #endif
-    , msgFlags   :: !CInt
+    , msgFlags   :: CInt
     }
 
 instance Storable (MsgHdr sa) where
-  sizeOf    _ = (#const sizeof(struct msghdr))
-  alignment _ = alignment (0 :: CInt)
+  sizeOf    ~_ = (#const sizeof(struct msghdr))
+  alignment ~_ = alignment (0 :: CInt)
 
   peek p = do
     name       <- (#peek struct msghdr, msg_name)       p
diff --git a/Network/Socket/ReadShow.hs b/Network/Socket/ReadShow.hs
--- a/Network/Socket/ReadShow.hs
+++ b/Network/Socket/ReadShow.hs
@@ -1,16 +1,15 @@
-{-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE PatternGuards #-}
-{-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE RankNTypes #-}
-
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 
 module Network.Socket.ReadShow where
 
+import Control.Monad (mzero)
 import Text.Read ((<++))
 import qualified Text.Read as P
 import qualified Text.Read.Lex as P
-import Control.Monad (mzero)
 
 -- type alias for individual correspondences of a (possibly partial) bijection
 type Pair a b = (a, b)
@@ -18,13 +17,12 @@
 -- | helper function for equality on first tuple element
 {-# INLINE eqFst #-}
 eqFst :: Eq a => a -> (a, b) -> Bool
-eqFst x = \(x',_) -> x' == x
+eqFst x = \(x', _) -> x' == x
 
 -- | helper function for equality on snd tuple element
 {-# INLINE eqSnd #-}
 eqSnd :: Eq b => b -> (a, b) -> Bool
-eqSnd y = \(_,y') -> y' == y
-
+eqSnd y = \(_, y') -> y' == y
 
 -- | Unified automorphic involution over @Either a b@ that converts between
 --   LHS and RHS elements of a list of @Pair a b@ mappings and is the identity
@@ -33,9 +31,9 @@
 --   If list contains duplicate matches, short-circuits to the first matching @Pair@
 lookBetween :: (Eq a, Eq b) => [Pair a b] -> Either a b -> Either a b
 lookBetween ps = \case
-  Left  x | (_,y):_ <- filter (eqFst x) ps -> Right y
-  Right y | (x,_):_ <- filter (eqSnd y) ps -> Left  x
-  z -> z
+    Left x | (_, y) : _ <- filter (eqFst x) ps -> Right y
+    Right y | (x, _) : _ <- filter (eqSnd y) ps -> Left x
+    z -> z
 
 -- Type alias for partial bijections between two types, consisting of a list
 -- of individual correspondences that are checked in order and short-circuit
@@ -53,13 +51,15 @@
 namePrefix :: Int -> String -> (Int -> b -> ShowS) -> b -> ShowS
 namePrefix i name f x
     | null name = f i x
-    | otherwise = showParen (i > app_prec) $ showString name . showChar ' ' . f (app_prec+1) x
+    | otherwise =
+        showParen (i > app_prec) $ showString name . showChar ' ' . f (app_prec + 1) x
 {-# INLINE namePrefix #-}
 
 -- | Helper function for defining bijective Show instances that represents
 -- a common use-case where a constructor (or constructor-like pattern) name
 -- (optionally) precedes an internal value with a separate show function
-defShow :: Eq a => String -> (a -> b) -> (Int -> b -> ShowS) -> (Int -> a -> ShowS)
+defShow
+    :: Eq a => String -> (a -> b) -> (Int -> b -> ShowS) -> (Int -> a -> ShowS)
 defShow name unwrap shoPrec = \i x -> namePrefix i name shoPrec (unwrap x)
 {-# INLINE defShow #-}
 
@@ -82,7 +82,7 @@
 {-# INLINE defRead #-}
 
 -- | Alias for showsPrec that pairs well with `_readInt`
-_showInt :: (Show a) => Int -> a -> ShowS
+_showInt :: Show a => Int -> a -> ShowS
 _showInt = showsPrec
 {-# INLINE _showInt #-}
 
@@ -98,27 +98,29 @@
 {-# INLINE showIntInt #-}
 
 -- | consume and return two integer-like values from two consecutive lexical tokens
-readIntInt :: (Bounded a, Integral a, Bounded b, Integral b) => P.ReadPrec (a, b)
+readIntInt
+    :: (Bounded a, Integral a, Bounded b, Integral b) => P.ReadPrec (a, b)
 readIntInt = do
-  x <- _readInt
-  y <- _readInt
-  return (x, y)
+    x <- _readInt
+    y <- _readInt
+    return (x, y)
 {-# INLINE readIntInt #-}
 
-bijectiveShow :: (Eq a) => Bijection a String -> (Int -> a -> ShowS) -> (Int -> a -> ShowS)
+bijectiveShow
+    :: Eq a => Bijection a String -> (Int -> a -> ShowS) -> (Int -> a -> ShowS)
 bijectiveShow bi def = \i x ->
     case lookBetween bi (Left x) of
         Right y -> showString y
         _ -> def i x
 
-bijectiveRead :: (Eq a) => Bijection a String -> P.ReadPrec a -> P.ReadPrec a
+bijectiveRead :: Eq a => Bijection a String -> P.ReadPrec a -> P.ReadPrec a
 bijectiveRead bi def = P.parens $ bijective <++ def
   where
     bijective = do
-      (P.Ident y) <- P.lexP
-      case lookBetween bi (Right y) of
-          Left x -> return x
-          _ -> mzero
+        (P.Ident y) <- P.lexP
+        case lookBetween bi (Right y) of
+            Left x -> return x
+            _ -> mzero
 
 app_prec :: Int
 app_prec = 10
@@ -129,8 +131,8 @@
 safeInt = do
     i <- signed
     if (i >= fromIntegral (minBound :: a) && i <= fromIntegral (maxBound :: a))
-    then return $ fromIntegral i
-    else mzero
+        then return $ fromIntegral i
+        else mzero
   where
     signed :: P.ReadPrec Integer
     signed = P.readPrec
diff --git a/Network/Socket/STM.hs b/Network/Socket/STM.hs
new file mode 100644
--- /dev/null
+++ b/Network/Socket/STM.hs
@@ -0,0 +1,24 @@
+module Network.Socket.STM where
+
+import Control.Concurrent
+import Control.Concurrent.STM
+import Network.Socket.Types
+import System.Posix.Types
+
+-- | STM action to wait until the socket is ready for reading.
+waitReadSocketSTM :: Socket -> IO (STM ())
+waitReadSocketSTM s = fst <$> waitAndCancelReadSocketSTM s
+
+-- | STM action to wait until the socket is ready for reading and STM
+--   action to cancel the waiting.
+waitAndCancelReadSocketSTM :: Socket -> IO (STM (), IO ())
+waitAndCancelReadSocketSTM s = withFdSocket s $ threadWaitReadSTM . Fd
+
+-- | STM action to wait until the socket is ready for writing.
+waitWriteSocketSTM :: Socket -> IO (STM ())
+waitWriteSocketSTM s = fst <$> waitAndCancelWriteSocketSTM s
+
+-- | STM action to wait until the socket is ready for writing and STM
+--   action to cancel the waiting.
+waitAndCancelWriteSocketSTM :: Socket -> IO (STM (), IO ())
+waitAndCancelWriteSocketSTM s = withFdSocket s $ threadWaitWriteSTM . Fd
diff --git a/Network/Socket/Shutdown.hs b/Network/Socket/Shutdown.hs
--- a/Network/Socket/Shutdown.hs
+++ b/Network/Socket/Shutdown.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 
 #include "HsNetDef.h"
 
@@ -8,14 +9,20 @@
   , gracefulClose
   ) where
 
+import Control.Concurrent (yield)
 import qualified Control.Exception as E
 import Foreign.Marshal.Alloc (mallocBytes, free)
+import System.Timeout
 
-import Control.Concurrent (threadDelay)
+#if !defined(mingw32_HOST_OS)
+import Control.Concurrent.STM
+import qualified GHC.Event as Ev
+#endif
 
 import Network.Socket.Buffer
 import Network.Socket.Imports
 import Network.Socket.Internal
+import Network.Socket.STM
 import Network.Socket.Types
 
 data ShutdownCmd = ShutdownReceive
@@ -47,32 +54,67 @@
 --
 --   Since: 3.1.1.0
 gracefulClose :: Socket -> Int -> IO ()
-gracefulClose s tmout = sendRecvFIN `E.finally` close s
+gracefulClose s tmout0 = sendRecvFIN `E.finally` close s
   where
     sendRecvFIN = do
         -- Sending TCP FIN.
         ex <- E.try $ shutdown s ShutdownSend
         case ex of
-          Left (E.SomeException _) -> return ()
+          -- Don't catch asynchronous exceptions
+          Left (_ :: E.IOException) -> return ()
           Right () -> do
+              -- Giving CPU time to other threads hoping that
+              -- FIN arrives meanwhile.
+              yield
               -- Waiting TCP FIN.
-              E.bracket (mallocBytes bufSize) free $ \buf -> do
-                  {-# SCC "" #-} recvEOFloop buf
-    -- milliseconds. Taken from BSD fast clock value.
-    clock = 200
-    recvEOFloop buf = loop 0
-      where
-        loop delay = do
-            -- We don't check the (positive) length.
-            -- In normal case, it's 0. That is, only FIN is received.
-            -- In error cases, data is available. But there is no
-            -- application which can read it. So, let's stop receiving
-            -- to prevent attacks.
-            r <- recvBufNoWait s buf bufSize
-            let delay' = delay + clock
-            when (r == -1 && delay' < tmout) $ do
-                threadDelay (clock * 1000)
-                loop delay'
-    -- Don't use 4092 here. The GHC runtime takes the global lock
-    -- if the length is over 3276 bytes in 32bit or 3272 bytes in 64bit.
-    bufSize = 1024
+              E.bracket (mallocBytes bufSize) free (recvEOF s tmout0)
+
+recvEOF :: Socket -> Int -> Ptr Word8 -> IO ()
+#if !defined(mingw32_HOST_OS)
+recvEOF s tmout0 buf = do
+    mevmgr <- Ev.getSystemEventManager
+    case mevmgr of
+      Nothing -> recvEOFtimeout s tmout0 buf
+      Just _ -> recvEOFevent s tmout0 buf
+#else
+recvEOF = recvEOFtimeout
+#endif
+
+-- Don't use 4092 here. The GHC runtime takes the global lock
+-- if the length is over 3276 bytes in 32bit or 3272 bytes in 64bit.
+bufSize :: Int
+bufSize = 1024
+
+recvEOFtimeout :: Socket -> Int -> Ptr Word8 -> IO ()
+recvEOFtimeout s tmout0 buf = void $ timeout tmout0 $ recvBuf s buf bufSize
+
+#if !defined(mingw32_HOST_OS)
+data Wait = MoreData | TimeoutTripped
+
+recvEOFevent :: Socket -> Int -> Ptr Word8 -> IO ()
+recvEOFevent s tmout0 buf = do
+    tmmgr <- Ev.getSystemTimerManager
+    tvar <- newTVarIO False
+    E.bracket (setupTimeout tmmgr tvar) (cancelTimeout tmmgr) $ \_ -> do
+        E.bracket (setupRead s) cancelRead $ \(rxWait,_) -> do
+            let toWait = readTVar tvar >>= check
+                wait = atomically ((toWait >> return TimeoutTripped)
+                               <|> (rxWait >> return MoreData))
+            waitRes <- wait
+            case waitRes of
+              TimeoutTripped -> return ()
+              -- We don't check the (positive) length.
+              -- In normal case, it's 0. That is, only FIN is received.
+              -- In error cases, data is available. But there is no
+              -- application which can read it. So, let's stop receiving
+              -- to prevent attacks.
+              MoreData       -> void $ recvBufNoWait s buf bufSize
+  where
+    -- millisecond to microsecond
+    tmout = tmout0 * 1000
+    setupTimeout tmmgr tvar =
+        Ev.registerTimeout tmmgr tmout $ atomically $ writeTVar tvar True
+    cancelTimeout = Ev.unregisterTimeout
+    setupRead = waitAndCancelReadSocketSTM
+    cancelRead (_,cancel) = cancel
+#endif
diff --git a/Network/Socket/SockAddr.hs b/Network/Socket/SockAddr.hs
--- a/Network/Socket/SockAddr.hs
+++ b/Network/Socket/SockAddr.hs
@@ -1,25 +1,26 @@
 {-# LANGUAGE CPP #-}
+
 module Network.Socket.SockAddr (
-      getPeerName
-    , getSocketName
-    , connect
-    , bind
-    , accept
-    , sendBufTo
-    , recvBufFrom
-    , sendBufMsg
-    , recvBufMsg
-    ) where
+    getPeerName,
+    getSocketName,
+    connect,
+    bind,
+    accept,
+    sendBufTo,
+    recvBufFrom,
+    sendBufMsg,
+    recvBufMsg,
+) where
 
-import Control.Exception (try, throwIO, IOException)
+import Control.Exception (IOException, throwIO, try)
 import System.Directory (removeFile)
 import System.IO.Error (isAlreadyInUseError, isDoesNotExistError)
 
 import qualified Network.Socket.Buffer as G
-import qualified Network.Socket.Name as G
-import qualified Network.Socket.Syscall as G
 import Network.Socket.Flag
 import Network.Socket.Imports
+import qualified Network.Socket.Name as G
+import qualified Network.Socket.Syscall as G
 #if !defined(mingw32_HOST_OS)
 import Network.Socket.Posix.Cmsg
 #else
@@ -46,24 +47,24 @@
 -- use port.
 bind :: Socket -> SockAddr -> IO ()
 bind s a = case a of
-  SockAddrUnix p -> do
-    -- gracefully handle the fact that UNIX systems don't clean up closed UNIX
-    -- domain sockets, inspired by https://stackoverflow.com/a/13719866
-    res <- try (G.bind s a)
-    case res of
-      Right () -> return ()
-      Left e | not (isAlreadyInUseError e) -> throwIO (e :: IOException)
-      Left e | otherwise -> do
-        -- socket might be in use, try to connect
-        res2 <- try (G.connect s a)
-        case res2 of
-          Right () -> close s >> throwIO e
-          Left e2 | not (isDoesNotExistError e2) -> throwIO (e2 :: IOException)
-          _ -> do
-            -- socket not actually in use, remove it and retry bind
-            void (try $ removeFile p :: IO (Either IOError ()))
-            G.bind s a
-  _ -> G.bind s a
+    SockAddrUnix p -> do
+        -- gracefully handle the fact that UNIX systems don't clean up closed UNIX
+        -- domain sockets, inspired by https://stackoverflow.com/a/13719866
+        res <- try (G.bind s a)
+        case res of
+            Right () -> return ()
+            Left e | not (isAlreadyInUseError e) -> throwIO (e :: IOException)
+            Left e | otherwise -> do
+                -- socket might be in use, try to connect
+                res2 <- try (G.connect s a)
+                case res2 of
+                    Right () -> close s >> throwIO e
+                    Left e2 | not (isDoesNotExistError e2) -> throwIO (e2 :: IOException)
+                    _ -> do
+                        -- socket not actually in use, remove it and retry bind
+                        void (try $ removeFile p :: IO (Either IOError ()))
+                        G.bind s a
+    _ -> G.bind s a
 
 -- | Accept a connection.  The socket must be bound to an address and
 -- listening for connections.  The return value is a pair @(conn,
@@ -97,22 +98,35 @@
 recvBufFrom = G.recvBufFrom
 
 -- | Send data to the socket using sendmsg(2).
-sendBufMsg :: Socket            -- ^ Socket
-           -> SockAddr          -- ^ Destination address
-           -> [(Ptr Word8,Int)] -- ^ Data to be sent
-           -> [Cmsg]            -- ^ Control messages
-           -> MsgFlag           -- ^ Message flags
-           -> IO Int            -- ^ The length actually sent
+sendBufMsg
+    :: Socket
+    -- ^ Socket
+    -> SockAddr
+    -- ^ Destination address
+    -> [(Ptr Word8, Int)]
+    -- ^ Data to be sent
+    -> [Cmsg]
+    -- ^ Control messages
+    -> MsgFlag
+    -- ^ Message flags
+    -> IO Int
+    -- ^ The length actually sent
 sendBufMsg = G.sendBufMsg
 
 -- | Receive data from the socket using recvmsg(2).
-recvBufMsg :: Socket            -- ^ Socket
-        -> [(Ptr Word8,Int)] -- ^ A list of a pair of buffer and its size.
-                             --   If the total length is not large enough,
-                             --   'MSG_TRUNC' is returned
-        -> Int               -- ^ The buffer size for control messages.
-                             --   If the length is not large enough,
-                             --   'MSG_CTRUNC' is returned
-        -> MsgFlag           -- ^ Message flags
-        -> IO (SockAddr,Int,[Cmsg],MsgFlag) -- ^ Source address, received data, control messages and message flags
+recvBufMsg
+    :: Socket
+    -- ^ Socket
+    -> [(Ptr Word8, Int)]
+    -- ^ A list of a pair of buffer and its size.
+    --   If the total length is not large enough,
+    --   'MSG_TRUNC' is returned
+    -> Int
+    -- ^ The buffer size for control messages.
+    --   If the length is not large enough,
+    --   'MSG_CTRUNC' is returned
+    -> MsgFlag
+    -- ^ Message flags
+    -> IO (SockAddr, Int, [Cmsg], MsgFlag)
+    -- ^ Source address, received data, control messages and message flags
 recvBufMsg = G.recvBufMsg
diff --git a/Network/Socket/Syscall.hs b/Network/Socket/Syscall.hs
--- a/Network/Socket/Syscall.hs
+++ b/Network/Socket/Syscall.hs
@@ -11,6 +11,7 @@
 #endif
 
 #if defined(mingw32_HOST_OS)
+import Control.Exception (bracket)
 import Foreign (FunPtr)
 import GHC.Conc (asyncDoProc)
 #else
@@ -63,8 +64,9 @@
 -- can be handled with one socket.
 --
 -- >>> import Network.Socket
+-- >>> import qualified Data.List.NonEmpty as NE
 -- >>> let hints = defaultHints { addrFlags = [AI_NUMERICHOST, AI_NUMERICSERV], addrSocketType = Stream }
--- >>> addr:_ <- getAddrInfo (Just hints) (Just "127.0.0.1") (Just "5000")
+-- >>> addr <- NE.head <$> getAddrInfo (Just hints) (Just "127.0.0.1") (Just "5000")
 -- >>> sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
 -- >>> Network.Socket.bind sock (addrAddress addr)
 -- >>> getSocketName sock
@@ -81,6 +83,7 @@
     -- This socket is not managed by the IO manager yet.
     -- So, we don't have to call "close" which uses "closeFdWith".
     unsetIPv6Only s
+    setDontFragment s
     return s
   where
     create = do
@@ -118,6 +121,15 @@
     unsetIPv6Only _ = return ()
 #endif
 
+    setDontFragment s = when (family == AF_INET) $
+#if HAVE_DECL_IP_DONTFRAG || HAVE_DECL_IP_MTU_DISCOVER
+      setSocketOption s DontFragment 1
+#else
+      -- do nothing
+      return ()
+#endif
+
+
 -----------------------------------------------------------------------------
 -- Binding a socket
 
@@ -191,7 +203,7 @@
 accept :: SocketAddress sa => Socket -> IO (Socket, sa)
 accept listing_sock = withNewSocketAddress $ \new_sa sz ->
     withFdSocket listing_sock $ \listing_fd -> do
- new_sock <- callAccept listing_fd new_sa sz >>= mkSocket
+ new_sock <- E.bracketOnError (callAccept listing_fd new_sa sz) c_close mkSocket
  new_addr <- peekSocketAddress new_sa
  return (new_sock, new_addr)
   where
@@ -201,13 +213,12 @@
                        throwSocketErrorIfMinus1Retry "Network.Socket.accept" $
                          c_accept_safe fd sa ptr_len
        | otherwise = do
-             paramData <- c_newAcceptParams fd (fromIntegral sz) sa
-             rc        <- asyncDoProc c_acceptDoProc paramData
-             new_fd    <- c_acceptNewSock paramData
-             c_free paramData
-             when (rc /= 0) $
-               throwSocketErrorCode "Network.Socket.accept" (fromIntegral rc)
-             return new_fd
+             bracket (c_newAcceptParams fd (fromIntegral sz) sa) c_free $ \paramData -> do
+                 rc     <- asyncDoProc c_acceptDoProc paramData
+                 new_fd <- c_acceptNewSock paramData
+                 when (rc /= 0) $
+                     throwSocketErrorCode "Network.Socket.accept" (fromIntegral rc)
+                 return new_fd
 #else
      callAccept fd sa sz = with (fromIntegral sz) $ \ ptr_len -> do
 # ifdef HAVE_ADVANCED_SOCKET_FLAGS
diff --git a/Network/Socket/Types.hsc b/Network/Socket/Types.hsc
--- a/Network/Socket/Types.hsc
+++ b/Network/Socket/Types.hsc
@@ -57,6 +57,7 @@
     , isSupportedSockAddr
     , HostAddress
     , hostAddressToTuple
+    , hostAddressToTuple'
     , tupleToHostAddress
     , HostAddress6
     , hostAddress6ToTuple
@@ -67,6 +68,9 @@
     , pokeSockAddr
     , withSockAddr
 
+    -- * Null socket address type
+    , NullSockAddr(..)
+
     -- * Unsorted
     , ProtocolNumber
     , defaultProtocol
@@ -93,9 +97,7 @@
 
 import qualified Text.Read as P
 
-#if defined(DOMAIN_SOCKET_SUPPORT)
 import Foreign.Marshal.Array
-#endif
 
 import Network.Socket.Imports
 
@@ -106,7 +108,7 @@
 -----------------------------------------------------------------------------
 
 -- | Basic type for a socket.
-data Socket = Socket !(IORef CInt) !CInt {- for Show -}
+data Socket = Socket (IORef CInt) CInt {- for Show -}
 
 instance Show Socket where
     show (Socket _ ofd) = "<socket: " ++ show ofd ++ ">"
@@ -347,35 +349,35 @@
 #ifdef SOCK_STREAM
 pattern Stream               = SocketType (#const SOCK_STREAM)
 #else
-pattern Stream               = (-1)
+pattern Stream               = UnsupportedSocketType
 #endif
 
 pattern Datagram            :: SocketType
 #ifdef SOCK_DGRAM
 pattern Datagram             = SocketType (#const SOCK_DGRAM)
 #else
-pattern Datagram             = (-1)
+pattern Datagram             = UnsupportedSocketType
 #endif
 
 pattern Raw                 :: SocketType
 #ifdef SOCK_RAW
 pattern Raw                  = SocketType (#const SOCK_RAW)
 #else
-pattern Raw                  = (-1)
+pattern Raw                  = UnsupportedSocketType
 #endif
 
 pattern RDM                 :: SocketType
 #ifdef SOCK_RDM
 pattern RDM                  = SocketType (#const SOCK_RDM)
 #else
-pattern RDM                  = (-1)
+pattern RDM                  = UnsupportedSocketType
 #endif
 
 pattern SeqPacket           :: SocketType
 #ifdef SOCK_SEQPACKET
 pattern SeqPacket            = SocketType (#const SOCK_SEQPACKET)
 #else
-pattern SeqPacket            = (-1)
+pattern SeqPacket            = UnsupportedSocketType
 #endif
 
 ------------------------------------------------------------------------
@@ -984,8 +986,8 @@
 {-# DEPRECATED ntohl "Use getAddrInfo instead" #-}
 
 instance Storable PortNumber where
-   sizeOf    _ = sizeOf    (0 :: Word16)
-   alignment _ = alignment (0 :: Word16)
+   sizeOf    ~_ = sizeOf    (0 :: Word16)
+   alignment ~_ = alignment (0 :: Word16)
    poke p (PortNum po) = poke (castPtr p) (htons po)
    peek p = PortNum . ntohs <$> peek (castPtr p)
 
@@ -1009,6 +1011,7 @@
 sockaddrStorageLen :: Int
 sockaddrStorageLen = 128
 
+{-# NOINLINE withSocketAddress #-}
 withSocketAddress :: SocketAddress sa => sa -> (Ptr sa -> Int -> IO a) -> IO a
 withSocketAddress addr f = do
     let sz = sizeOfSocketAddress addr
@@ -1023,6 +1026,17 @@
     f ptr sockaddrStorageLen
 
 ------------------------------------------------------------------------
+
+-- | A null 'SocketAddress' for situations where a socket address
+--   parameter is optional.
+data NullSockAddr = NullSockAddr
+
+instance SocketAddress NullSockAddr where
+    sizeOfSocketAddress _ = 0
+    peekSocketAddress _   = return NullSockAddr
+    pokeSocketAddress _ _ = return ()
+
+------------------------------------------------------------------------
 -- Socket addresses
 
 -- The scheme used for addressing sockets is somewhat quirky. The
@@ -1053,13 +1067,13 @@
 -- 'isSupportedSockAddr'.
 data SockAddr
   = SockAddrInet
-        !PortNumber      -- sin_port
-        !HostAddress     -- sin_addr  (ditto)
+        PortNumber      -- sin_port
+        HostAddress     -- sin_addr  (ditto)
   | SockAddrInet6
-        !PortNumber      -- sin6_port
-        !FlowInfo        -- sin6_flowinfo (ditto)
-        !HostAddress6    -- sin6_addr (ditto)
-        !ScopeID         -- sin6_scope_id (ditto)
+        PortNumber      -- sin6_port
+        FlowInfo        -- sin6_flowinfo (ditto)
+        HostAddress6    -- sin6_addr (ditto)
+        ScopeID         -- sin6_scope_id (ditto)
   -- | The path must have fewer than 104 characters. All of these characters must have code points less than 256.
   | SockAddrUnix
         String           -- sun_path
@@ -1075,11 +1089,7 @@
 isSupportedSockAddr addr = case addr of
   SockAddrInet{}  -> True
   SockAddrInet6{} -> True
-#if defined(DOMAIN_SOCKET_SUPPORT)
   SockAddrUnix{}  -> True
-#else
-  SockAddrUnix{}  -> False
-#endif
 
 instance SocketAddress SockAddr where
     sizeOfSocketAddress = sizeOfSockAddr
@@ -1098,7 +1108,6 @@
 -- 'SockAddr'.  This function differs from 'Foreign.Storable.sizeOf'
 -- in that the value of the argument /is/ used.
 sizeOfSockAddr :: SockAddr -> Int
-#if defined(DOMAIN_SOCKET_SUPPORT)
 # ifdef linux_HOST_OS
 -- http://man7.org/linux/man-pages/man7/unix.7.html says:
 -- "an abstract socket address is distinguished (from a
@@ -1118,12 +1127,12 @@
 # else
 sizeOfSockAddr SockAddrUnix{}  = #const sizeof(struct sockaddr_un)
 # endif
-#else
-sizeOfSockAddr SockAddrUnix{}  = error "sizeOfSockAddr: not supported"
-#endif
 sizeOfSockAddr SockAddrInet{}  = #const sizeof(struct sockaddr_in)
 sizeOfSockAddr SockAddrInet6{} = #const sizeof(struct sockaddr_in6)
 
+-- The combination of "-XString" and inlining results in a bug where
+-- "sz" is always 0.
+{-# NOINLINE withSockAddr #-}
 -- | Use a 'SockAddr' with a function requiring a pointer to a
 -- 'SockAddr' and the length of that 'SockAddr'.
 withSockAddr :: SockAddr -> (Ptr SockAddr -> Int -> IO a) -> IO a
@@ -1135,10 +1144,8 @@
 -- structure, and attempting to do so could overflow the allocated storage
 -- space.  This constant holds the maximum allowable path length.
 --
-#if defined(DOMAIN_SOCKET_SUPPORT)
 unixPathMax :: Int
 unixPathMax = #const sizeof(((struct sockaddr_un *)NULL)->sun_path)
-#endif
 
 -- We can't write an instance of 'Storable' for 'SockAddr' because
 -- @sockaddr@ is a sum type of variable size but
@@ -1149,22 +1156,19 @@
 
 -- | Write the given 'SockAddr' to the given memory location.
 pokeSockAddr :: Ptr a -> SockAddr -> IO ()
-#if defined(DOMAIN_SOCKET_SUPPORT)
 pokeSockAddr p sa@(SockAddrUnix path) = do
-    when (length path > unixPathMax) $ error
+    let pathC = map castCharToCChar path
+        len = length pathC
+    when (len >= unixPathMax) $ error
       $ "pokeSockAddr: path is too long in SockAddrUnix " <> show path
-      <> ", length " <> show (length path) <> ", unixPathMax " <> show unixPathMax
+      <> ", length " <> show len <> ", unixPathMax " <> show unixPathMax
     zeroMemory p $ fromIntegral $ sizeOfSockAddr sa
 # if defined(HAVE_STRUCT_SOCKADDR_SA_LEN)
     (#poke struct sockaddr_un, sun_len) p ((#const sizeof(struct sockaddr_un)) :: Word8)
 # endif
     (#poke struct sockaddr_un, sun_family) p ((#const AF_UNIX) :: CSaFamily)
-    let pathC = map castCharToCChar path
     -- the buffer is already filled with nulls.
     pokeArray ((#ptr struct sockaddr_un, sun_path) p) pathC
-#else
-pokeSockAddr _ SockAddrUnix{} = error "pokeSockAddr: not supported"
-#endif
 pokeSockAddr p (SockAddrInet port addr) = do
     zeroMemory p (#const sizeof(struct sockaddr_in))
 #if defined(HAVE_STRUCT_SOCKADDR_SA_LEN)
@@ -1189,11 +1193,9 @@
 peekSockAddr p = do
   family <- (#peek struct sockaddr, sa_family) p
   case family :: CSaFamily of
-#if defined(DOMAIN_SOCKET_SUPPORT)
     (#const AF_UNIX) -> do
         str <- peekCAString ((#ptr struct sockaddr_un, sun_path) p)
         return (SockAddrUnix str)
-#endif
     (#const AF_INET) -> do
         addr <- (#peek struct sockaddr_in, sin_addr) p
         port <- (#peek struct sockaddr_in, sin_port) p
@@ -1230,6 +1232,11 @@
         byte i = fromIntegral (ha `shiftR` i) :: Word8
     in (byte 24, byte 16, byte 8, byte 0)
 
+hostAddressToTuple' :: HostAddress -> (Word8, Word8, Word8, Word8)
+hostAddressToTuple' ha =
+    let byte i = fromIntegral (ha `shiftR` i) :: Word8
+    in (byte 24, byte 16, byte 8, byte 0)
+
 -- | Converts IPv4 quadruple to 'HostAddress'.
 tupleToHostAddress :: (Word8, Word8, Word8, Word8) -> HostAddress
 tupleToHostAddress (b3, b2, b1, b0) =
@@ -1297,8 +1304,8 @@
 #endif
 
 instance Storable In6Addr where
-    sizeOf    _ = #const sizeof(struct in6_addr)
-    alignment _ = #alignment struct in6_addr
+    sizeOf    ~_ = #const sizeof(struct in6_addr)
+    alignment ~_ = #alignment struct in6_addr
 
     peek p = do
         a <- peek32 p 0
diff --git a/Network/Socket/Unix.hsc b/Network/Socket/Unix.hsc
--- a/Network/Socket/Unix.hsc
+++ b/Network/Socket/Unix.hsc
@@ -1,4 +1,5 @@
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 
 #include "HsNet.h"
 ##include "HsNetDef.h"
@@ -13,14 +14,24 @@
   , getPeerEid
   ) where
 
-import System.Posix.Types (Fd(..))
-
+import Foreign.Marshal.Alloc (allocaBytes)
 import Network.Socket.Buffer
+import Network.Socket.Fcntl
 import Network.Socket.Imports
-#if !defined(mingw32_HOST_OS)
+import Network.Socket.Types
+import System.Posix.Types (Fd(..))
+
+#if defined(mingw32_HOST_OS)
+import Network.Socket.Syscall
+import Network.Socket.Win32.Cmsg
+import System.Directory
+import System.IO
+import System.IO.Temp
+#else
+import Foreign.Marshal.Array (peekArray)
+import Network.Socket.Internal
 import Network.Socket.Posix.Cmsg
 #endif
-import Network.Socket.Types
 
 #if defined(HAVE_GETPEEREID)
 import System.IO.Error (catchIOError)
@@ -28,13 +39,7 @@
 #ifdef HAVE_GETPEEREID
 import Foreign.Marshal.Alloc (alloca)
 #endif
-#ifdef DOMAIN_SOCKET_SUPPORT
-import Foreign.Marshal.Alloc (allocaBytes)
-import Foreign.Marshal.Array (peekArray)
 
-import Network.Socket.Fcntl
-import Network.Socket.Internal
-#endif
 #ifdef HAVE_STRUCT_UCRED_SO_PEERCRED
 import Network.Socket.Options
 #endif
@@ -83,8 +88,8 @@
 
 newtype PeerCred = PeerCred (CUInt, CUInt, CUInt)
 instance Storable PeerCred where
-    sizeOf    _ = (#const sizeof(struct ucred))
-    alignment _ = alignment (0 :: CInt)
+    sizeOf    ~_ = (#const sizeof(struct ucred))
+    alignment ~_ = alignment (0 :: CInt)
     poke _ _ = return ()
     peek p = do
         pid <- (#peek struct ucred, pid) p
@@ -121,63 +126,57 @@
 {-# Deprecated getPeerEid "Use getPeerCredential instead" #-}
 
 -- | Whether or not UNIX-domain sockets are available.
+--   'AF_UNIX' is supported on Windows since 3.1.3.0.
+--   So, this variable is 'True` on all platforms.
 --
 --   Since 2.7.0.0.
 isUnixDomainSocketAvailable :: Bool
-#if defined(DOMAIN_SOCKET_SUPPORT)
 isUnixDomainSocketAvailable = True
-#else
-isUnixDomainSocketAvailable = False
-#endif
 
-data NullSockAddr = NullSockAddr
-
-instance SocketAddress NullSockAddr where
-    sizeOfSocketAddress _ = 0
-    peekSocketAddress _   = return NullSockAddr
-    pokeSocketAddress _ _ = return ()
-
 -- | Send a file descriptor over a UNIX-domain socket.
---   Use this function in the case where 'isUnixDomainSocketAvailable' is
---  'True'.
+--   This function does not work on Windows.
 sendFd :: Socket -> CInt -> IO ()
-#if defined(DOMAIN_SOCKET_SUPPORT)
 sendFd s outfd = void $ allocaBytes dummyBufSize $ \buf -> do
-    let cmsg = encodeCmsg $ Fd outfd
+    let cmsg = encodeCmsg [Fd outfd]
     sendBufMsg s NullSockAddr [(buf,dummyBufSize)] [cmsg] mempty
   where
     dummyBufSize = 1
-#else
-sendFd _ _ = error "Network.Socket.sendFd"
-#endif
 
 -- | Receive a file descriptor over a UNIX-domain socket. Note that the resulting
 --   file descriptor may have to be put into non-blocking mode in order to be
 --   used safely. See 'setNonBlockIfNeeded'.
---   Use this function in the case where 'isUnixDomainSocketAvailable' is
---  'True'.
+--   This function does not work on Windows.
 recvFd :: Socket -> IO CInt
-#if defined(DOMAIN_SOCKET_SUPPORT)
 recvFd s = allocaBytes dummyBufSize $ \buf -> do
     (NullSockAddr, _, cmsgs, _) <- recvBufMsg s [(buf,dummyBufSize)] 32 mempty
-    case (lookupCmsg CmsgIdFd cmsgs >>= decodeCmsg) :: Maybe Fd of
-      Nothing      -> return (-1)
-      Just (Fd fd) -> return fd
+    case (lookupCmsg CmsgIdFds cmsgs >>= decodeCmsg) :: Maybe [Fd] of
+      Just (Fd fd : _) -> return fd
+      _                -> return (-1)
   where
     dummyBufSize = 16
-#else
-recvFd _ = error "Network.Socket.recvFd"
-#endif
 
 -- | Build a pair of connected socket objects.
---   For portability, use this function in the case
---   where 'isUnixDomainSocketAvailable' is 'True'
---   and specify 'AF_UNIX' to the first argument.
+--   On Windows, this function emulates socketpair() using
+--   'AF_UNIX' and a temporary file will remain.
 socketPair :: Family              -- Family Name (usually AF_UNIX)
            -> SocketType          -- Socket Type (usually Stream)
            -> ProtocolNumber      -- Protocol Number
            -> IO (Socket, Socket) -- unnamed and connected.
-#if defined(DOMAIN_SOCKET_SUPPORT)
+#if defined(mingw32_HOST_OS)
+socketPair _ _ _ = withSystemTempFile "temp-for-pair" $ \file hdl -> do
+    hClose hdl
+    removeFile file
+    listenSock <- socket AF_UNIX Stream defaultProtocol
+    bind listenSock $ SockAddrUnix file
+    listen listenSock 10
+    clientSock <- socket AF_UNIX Stream defaultProtocol
+    connect clientSock $ SockAddrUnix file
+    (serverSock, _ :: SockAddr) <- accept listenSock
+    close listenSock
+    withFdSocket clientSock setNonBlockIfNeeded
+    withFdSocket serverSock setNonBlockIfNeeded
+    return (clientSock, serverSock)
+#else
 socketPair family stype protocol =
     allocaBytes (2 * sizeOf (1 :: CInt)) $ \ fdArr -> do
       let c_stype = packSocketType stype
@@ -192,6 +191,4 @@
 
 foreign import ccall unsafe "socketpair"
   c_socketpair :: CInt -> CInt -> CInt -> Ptr CInt -> IO CInt
-#else
-socketPair _ _ _ = error "Network.Socket.socketPair"
 #endif
diff --git a/Network/Socket/Win32/Cmsg.hsc b/Network/Socket/Win32/Cmsg.hsc
--- a/Network/Socket/Win32/Cmsg.hsc
+++ b/Network/Socket/Win32/Cmsg.hsc
@@ -1,7 +1,8 @@
-
 {-# LANGUAGE AllowAmbiguousTypes #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -12,6 +13,7 @@
 #include "HsNet.h"
 
 import Data.ByteString.Internal
+import System.Posix.Types (Fd(..))
 import Foreign.ForeignPtr
 import System.IO.Unsafe (unsafeDupablePerformIO)
 
@@ -26,16 +28,16 @@
 
 -- | Control message (ancillary data) including a pair of level and type.
 data Cmsg = Cmsg {
-    cmsgId   :: !CmsgId
-  , cmsgData :: !ByteString
+    cmsgId   :: CmsgId
+  , cmsgData :: ByteString
   } deriving (Eq, Show)
 
 ----------------------------------------------------------------
 
 -- | Identifier of control message (ancillary data).
 data CmsgId = CmsgId {
-    cmsgLevel :: !CInt
-  , cmsgType  :: !CInt
+    cmsgLevel :: CInt
+  , cmsgType  :: CInt
   } deriving (Eq)
 
 -- | Unsupported identifier
@@ -69,8 +71,8 @@
 -- | Control message ID for POSIX file-descriptor passing.
 --
 --  Not supported on Windows; use WSADuplicateSocket instead
-pattern CmsgIdFd :: CmsgId
-pattern CmsgIdFd = CmsgId (-1) (-1)
+pattern CmsgIdFds :: CmsgId
+pattern CmsgIdFds = CmsgId (-1) (-1)
 
 ----------------------------------------------------------------
 
@@ -90,11 +92,13 @@
 ----------------------------------------------------------------
 
 -- | A class to encode and decode control message.
-class Storable a => ControlMessage a where
+class ControlMessage a where
     controlMessageId :: CmsgId
+    encodeCmsg :: a -> Cmsg
+    decodeCmsg :: Cmsg -> Maybe a
 
-encodeCmsg :: forall a. ControlMessage a => a -> Cmsg
-encodeCmsg x = unsafeDupablePerformIO $ do
+encodeStorableCmsg :: forall a. (ControlMessage a, Storable a) => a -> Cmsg
+encodeStorableCmsg x = unsafeDupablePerformIO $ do
     bs <- create siz $ \p0 -> do
         let p = castPtr p0
         poke p x
@@ -103,8 +107,8 @@
   where
     siz = sizeOf x
 
-decodeCmsg :: forall a . (ControlMessage a, Storable a) => Cmsg -> Maybe a
-decodeCmsg (Cmsg cmsid (PS fptr off len))
+decodeStorableCmsg :: forall a . (ControlMessage a, Storable a) => Cmsg -> Maybe a
+decodeStorableCmsg (Cmsg cmsid (PS fptr off len))
   | cid /= cmsid = Nothing
   | len < siz    = Nothing
   | otherwise = unsafeDupablePerformIO $ withForeignPtr fptr $ \p0 -> do
@@ -121,6 +125,8 @@
 
 instance ControlMessage IPv4TTL where
     controlMessageId = CmsgIdIPv4TTL
+    decodeCmsg = decodeStorableCmsg
+    encodeCmsg = encodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -129,6 +135,8 @@
 
 instance ControlMessage IPv6HopLimit where
     controlMessageId = CmsgIdIPv6HopLimit
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -137,6 +145,8 @@
 
 instance ControlMessage IPv4TOS where
     controlMessageId = CmsgIdIPv4TOS
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -145,6 +155,8 @@
 
 instance ControlMessage IPv6TClass where
     controlMessageId = CmsgIdIPv6TClass
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 ----------------------------------------------------------------
 
@@ -157,10 +169,12 @@
 
 instance ControlMessage IPv4PktInfo where
     controlMessageId = CmsgIdIPv4PktInfo
+    encodeCmsg = encodeStorableCmsg
+    decodeCmsg = decodeStorableCmsg
 
 instance Storable IPv4PktInfo where
-    sizeOf    _ = #{size IN_PKTINFO}
-    alignment _ = #alignment IN_PKTINFO
+    sizeOf    ~_ = #{size IN_PKTINFO}
+    alignment ~_ = #alignment IN_PKTINFO
     poke p (IPv4PktInfo n _ ha) = do
         (#poke IN_PKTINFO, ipi_ifindex)  p (fromIntegral n :: CInt)
         (#poke IN_PKTINFO, ipi_addr)     p ha
@@ -179,10 +193,12 @@
 
 instance ControlMessage IPv6PktInfo where
     controlMessageId = CmsgIdIPv6PktInfo
+    decodeCmsg = decodeStorableCmsg
+    encodeCmsg = encodeStorableCmsg
 
 instance Storable IPv6PktInfo where
-    sizeOf    _ = #{size IN6_PKTINFO}
-    alignment _ = #alignment IN6_PKTINFO
+    sizeOf    ~_ = #{size IN6_PKTINFO}
+    alignment ~_ = #alignment IN6_PKTINFO
     poke p (IPv6PktInfo n ha6) = do
         (#poke IN6_PKTINFO, ipi6_ifindex) p (fromIntegral n :: CInt)
         (#poke IN6_PKTINFO, ipi6_addr)    p (In6Addr ha6)
@@ -191,6 +207,15 @@
         n :: ULONG  <- (#peek IN6_PKTINFO, ipi6_ifindex) p
         return $ IPv6PktInfo (fromIntegral n) ha6
 
+----------------------------------------------------------------
+
+instance ControlMessage [Fd] where
+    controlMessageId = CmsgIdFds
+    encodeCmsg = \_ -> Cmsg CmsgIdFds ""
+    decodeCmsg = \_ -> Just []
+
+----------------------------------------------------------------
+
 cmsgIdBijection :: Bijection CmsgId String
 cmsgIdBijection =
     [ (UnsupportedCmsgId, "UnsupportedCmsgId")
@@ -200,7 +225,7 @@
     , (CmsgIdIPv6TClass, "CmsgIdIPv6TClass")
     , (CmsgIdIPv4PktInfo, "CmsgIdIPv4PktInfo")
     , (CmsgIdIPv6PktInfo, "CmsgIdIPv6PktInfo")
-    , (CmsgIdFd, "CmsgIdFd")
+    , (CmsgIdFds, "CmsgIdFds")
     ]
 
 instance Show CmsgId where
diff --git a/Network/Socket/Win32/CmsgHdr.hsc b/Network/Socket/Win32/CmsgHdr.hsc
--- a/Network/Socket/Win32/CmsgHdr.hsc
+++ b/Network/Socket/Win32/CmsgHdr.hsc
@@ -19,14 +19,14 @@
 import Network.Socket.Types
 
 data CmsgHdr = CmsgHdr {
-    cmsgHdrLen   :: !CUInt
-  , cmsgHdrLevel :: !CInt
-  , cmsgHdrType  :: !CInt
+    cmsgHdrLen   :: CUInt
+  , cmsgHdrLevel :: CInt
+  , cmsgHdrType  :: CInt
   } deriving (Eq, Show)
 
 instance Storable CmsgHdr where
-  sizeOf    _ = #{size WSACMSGHDR}
-  alignment _ = #alignment WSACMSGHDR
+  sizeOf    ~_ = #{size WSACMSGHDR}
+  alignment ~_ = #alignment WSACMSGHDR
 
   peek p = do
     len <- (#peek WSACMSGHDR, cmsg_len)   p
diff --git a/Network/Socket/Win32/MsgHdr.hsc b/Network/Socket/Win32/MsgHdr.hsc
--- a/Network/Socket/Win32/MsgHdr.hsc
+++ b/Network/Socket/Win32/MsgHdr.hsc
@@ -18,18 +18,18 @@
 -- The size of BufferLen is different on pre-vista compilers.
 -- But since those platforms are out of support anyway we ignore that.
 data MsgHdr sa = MsgHdr
-    { msgName      :: !(Ptr sa)
-    , msgNameLen   :: !CInt
-    , msgBuffer    :: !(Ptr WSABuf)
-    , msgBufferLen :: !DWORD
-    , msgCtrl      :: !(Ptr Word8)
-    , msgCtrlLen   :: !ULONG
-    , msgFlags     :: !DWORD
+    { msgName      :: Ptr sa
+    , msgNameLen   :: CInt
+    , msgBuffer    :: Ptr WSABuf
+    , msgBufferLen :: DWORD
+    , msgCtrl      :: Ptr Word8
+    , msgCtrlLen   :: ULONG
+    , msgFlags     :: DWORD
     } deriving Show
 
 instance Storable (MsgHdr sa) where
-  sizeOf    _ = #{size WSAMSG}
-  alignment _ = #alignment WSAMSG
+  sizeOf    ~_ = #{size WSAMSG}
+  alignment ~_ = #alignment WSAMSG
 
   peek p = do
     name       <- (#peek WSAMSG, name)          p
diff --git a/Network/Socket/Win32/WSABuf.hsc b/Network/Socket/Win32/WSABuf.hsc
--- a/Network/Socket/Win32/WSABuf.hsc
+++ b/Network/Socket/Win32/WSABuf.hsc
@@ -15,13 +15,13 @@
 type ULONG = Word32
 
 data WSABuf = WSABuf
-    { wsaBufPtr :: !(Ptr Word8)
-    , wsaBufLen :: !ULONG
+    { wsaBufPtr :: Ptr Word8
+    , wsaBufLen :: ULONG
     }
 
 instance Storable WSABuf where
-  sizeOf    _ = #{size WSABUF}
-  alignment _ = #alignment WSABUF
+  sizeOf    ~_ = #{size WSABUF}
+  alignment ~_ = #alignment WSABUF
 
   peek p = do
     base <- (#peek WSABUF, buf) p
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -10,7 +10,6 @@
 
 The `network` package support [3 major versions of GHC](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/intro.html#ghc-version-numbering-policy) only.
 This means that the current stable version and two previous stable versions are supported.
-However, all GHC 8.x are supported currently.
 
 ### Windows
 
@@ -44,31 +43,3 @@
 ```
 ##include "HsNetDef.h"
 ```
-
-## Milestones
-
-### 2.6
-
-- [x] Making `SockAddrCan` deprecated
-
-### 2.7
-
-See https://github.com/haskell/network/issues/296
-
-- [x] Making `Network` deprecated
-- [x] Making `Network.BSD` deprecated
-- [x] Making `MkSocket` deprecated
-- [x] Making many APIs deprecated
-
-### 2.8
-
-- [x] Stop exporting the `PortNum` Constructor in `PortNumber`
-
-### 3.0
-
-- [x] Removing `Network`
-- [x] Removing `Network.BSD`
-- [x] Removing `SockAddrCan`
-- [x] Changing the internal structure of `Socket`.
-- [x] Make address extensible.
-- [x] Remove EOF errors
diff --git a/config.guess b/config.guess
--- a/config.guess
+++ b/config.guess
@@ -1,14 +1,14 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
-#   Copyright 1992-2021 Free Software Foundation, Inc.
+#   Copyright 1992-2024 Free Software Foundation, Inc.
 
 # shellcheck disable=SC2006,SC2268 # see below for rationale
 
-timestamp='2021-06-03'
+timestamp='2024-01-01'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
+# the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful, but
@@ -47,7 +47,7 @@
 usage="\
 Usage: $0 [OPTION]
 
-Output the configuration name of the system \`$me' is run on.
+Output the configuration name of the system '$me' is run on.
 
 Options:
   -h, --help         print this help, then exit
@@ -60,13 +60,13 @@
 GNU config.guess ($timestamp)
 
 Originally written by Per Bothner.
-Copyright 1992-2021 Free Software Foundation, Inc.
+Copyright 1992-2024 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
 
 help="
-Try \`$me --help' for more information."
+Try '$me --help' for more information."
 
 # Parse command line
 while test $# -gt 0 ; do
@@ -102,8 +102,8 @@
 # temporary files to be created and, as you can see below, it is a
 # headache to deal with in a portable fashion.
 
-# Historically, `CC_FOR_BUILD' used to be named `HOST_CC'. We still
-# use `HOST_CC' if defined, but it is deprecated.
+# Historically, 'CC_FOR_BUILD' used to be named 'HOST_CC'. We still
+# use 'HOST_CC' if defined, but it is deprecated.
 
 # Portable tmp directory creation inspired by the Autoconf team.
 
@@ -155,6 +155,9 @@
 
 	set_cc_for_build
 	cat <<-EOF > "$dummy.c"
+	#if defined(__ANDROID__)
+	LIBC=android
+	#else
 	#include <features.h>
 	#if defined(__UCLIBC__)
 	LIBC=uclibc
@@ -162,6 +165,8 @@
 	LIBC=dietlibc
 	#elif defined(__GLIBC__)
 	LIBC=gnu
+	#elif defined(__LLVM_LIBC__)
+	LIBC=llvm
 	#else
 	#include <stdarg.h>
 	/* First heuristic to detect musl libc.  */
@@ -169,6 +174,7 @@
 	LIBC=musl
 	#endif
 	#endif
+	#endif
 	EOF
 	cc_set_libc=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^LIBC' | sed 's, ,,g'`
 	eval "$cc_set_libc"
@@ -437,7 +443,7 @@
 	# This test works for both compilers.
 	if test "$CC_FOR_BUILD" != no_compiler_found; then
 	    if (echo '#ifdef __amd64'; echo IS_64BIT_ARCH; echo '#endif') | \
-		(CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
+		(CCOPTS="" $CC_FOR_BUILD -m64 -E - 2>/dev/null) | \
 		grep IS_64BIT_ARCH >/dev/null
 	    then
 		SUN_ARCH=x86_64
@@ -459,7 +465,7 @@
 		UNAME_RELEASE=`uname -v`
 		;;
 	esac
-	# Japanese Language versions have a version number like `4.1.3-JL'.
+	# Japanese Language versions have a version number like '4.1.3-JL'.
 	SUN_REL=`echo "$UNAME_RELEASE" | sed -e 's/-/_/'`
 	GUESS=sparc-sun-sunos$SUN_REL
 	;;
@@ -904,7 +910,7 @@
 	fi
 	;;
     *:FreeBSD:*:*)
-	UNAME_PROCESSOR=`/usr/bin/uname -p`
+	UNAME_PROCESSOR=`uname -p`
 	case $UNAME_PROCESSOR in
 	    amd64)
 		UNAME_PROCESSOR=x86_64 ;;
@@ -929,6 +935,9 @@
     i*:PW*:*)
 	GUESS=$UNAME_MACHINE-pc-pw32
 	;;
+    *:SerenityOS:*:*)
+        GUESS=$UNAME_MACHINE-pc-serenity
+        ;;
     *:Interix*:*)
 	case $UNAME_MACHINE in
 	    x86)
@@ -963,11 +972,37 @@
 	GNU_REL=`echo "$UNAME_RELEASE" | sed -e 's/[-(].*//'`
 	GUESS=$UNAME_MACHINE-unknown-$GNU_SYS$GNU_REL-$LIBC
 	;;
+    x86_64:[Mm]anagarm:*:*|i?86:[Mm]anagarm:*:*)
+	GUESS="$UNAME_MACHINE-pc-managarm-mlibc"
+	;;
+    *:[Mm]anagarm:*:*)
+	GUESS="$UNAME_MACHINE-unknown-managarm-mlibc"
+	;;
     *:Minix:*:*)
 	GUESS=$UNAME_MACHINE-unknown-minix
 	;;
     aarch64:Linux:*:*)
-	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+	set_cc_for_build
+	CPU=$UNAME_MACHINE
+	LIBCABI=$LIBC
+	if test "$CC_FOR_BUILD" != no_compiler_found; then
+	    ABI=64
+	    sed 's/^	    //' << EOF > "$dummy.c"
+	    #ifdef __ARM_EABI__
+	    #ifdef __ARM_PCS_VFP
+	    ABI=eabihf
+	    #else
+	    ABI=eabi
+	    #endif
+	    #endif
+EOF
+	    cc_set_abi=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^ABI' | sed 's, ,,g'`
+	    eval "$cc_set_abi"
+	    case $ABI in
+		eabi | eabihf) CPU=armv8l; LIBCABI=$LIBC$ABI ;;
+	    esac
+	fi
+	GUESS=$CPU-unknown-linux-$LIBCABI
 	;;
     aarch64_be:Linux:*:*)
 	UNAME_MACHINE=aarch64_be
@@ -1033,9 +1068,18 @@
     k1om:Linux:*:*)
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
 	;;
-    loongarch32:Linux:*:* | loongarch64:Linux:*:* | loongarchx32:Linux:*:*)
+    kvx:Linux:*:*)
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
 	;;
+    kvx:cos:*:*)
+	GUESS=$UNAME_MACHINE-unknown-cos
+	;;
+    kvx:mbr:*:*)
+	GUESS=$UNAME_MACHINE-unknown-mbr
+	;;
+    loongarch32:Linux:*:* | loongarch64:Linux:*:*)
+	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
+	;;
     m32r*:Linux:*:*)
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
 	;;
@@ -1148,16 +1192,27 @@
 	;;
     x86_64:Linux:*:*)
 	set_cc_for_build
+	CPU=$UNAME_MACHINE
 	LIBCABI=$LIBC
 	if test "$CC_FOR_BUILD" != no_compiler_found; then
-	    if (echo '#ifdef __ILP32__'; echo IS_X32; echo '#endif') | \
-		(CCOPTS="" $CC_FOR_BUILD -E - 2>/dev/null) | \
-		grep IS_X32 >/dev/null
-	    then
-		LIBCABI=${LIBC}x32
-	    fi
+	    ABI=64
+	    sed 's/^	    //' << EOF > "$dummy.c"
+	    #ifdef __i386__
+	    ABI=x86
+	    #else
+	    #ifdef __ILP32__
+	    ABI=x32
+	    #endif
+	    #endif
+EOF
+	    cc_set_abi=`$CC_FOR_BUILD -E "$dummy.c" 2>/dev/null | grep '^ABI' | sed 's, ,,g'`
+	    eval "$cc_set_abi"
+	    case $ABI in
+		x86) CPU=i686 ;;
+		x32) LIBCABI=${LIBC}x32 ;;
+	    esac
 	fi
-	GUESS=$UNAME_MACHINE-pc-linux-$LIBCABI
+	GUESS=$CPU-pc-linux-$LIBCABI
 	;;
     xtensa*:Linux:*:*)
 	GUESS=$UNAME_MACHINE-unknown-linux-$LIBC
@@ -1177,7 +1232,7 @@
 	GUESS=$UNAME_MACHINE-pc-sysv4.2uw$UNAME_VERSION
 	;;
     i*86:OS/2:*:*)
-	# If we were able to find `uname', then EMX Unix compatibility
+	# If we were able to find 'uname', then EMX Unix compatibility
 	# is probably installed.
 	GUESS=$UNAME_MACHINE-pc-os2-emx
 	;;
@@ -1318,7 +1373,7 @@
 		GUESS=ns32k-sni-sysv
 	fi
 	;;
-    PENTIUM:*:4.0*:*)	# Unisys `ClearPath HMP IX 4000' SVR4/MP effort
+    PENTIUM:*:4.0*:*)	# Unisys 'ClearPath HMP IX 4000' SVR4/MP effort
 			# says <Richard.M.Bartel@ccMail.Census.GOV>
 	GUESS=i586-unisys-sysv4
 	;;
@@ -1364,9 +1419,12 @@
     BePC:Haiku:*:*)	# Haiku running on Intel PC compatible.
 	GUESS=i586-pc-haiku
 	;;
-    x86_64:Haiku:*:*)
-	GUESS=x86_64-unknown-haiku
+    ppc:Haiku:*:*)	# Haiku running on Apple PowerPC
+	GUESS=powerpc-apple-haiku
 	;;
+    *:Haiku:*:*)	# Haiku modern gcc (not bound by BeOS compat)
+	GUESS=$UNAME_MACHINE-unknown-haiku
+	;;
     SX-4:SUPER-UX:*:*)
 	GUESS=sx4-nec-superux$UNAME_RELEASE
 	;;
@@ -1522,6 +1580,9 @@
     i*86:rdos:*:*)
 	GUESS=$UNAME_MACHINE-pc-rdos
 	;;
+    i*86:Fiwix:*:*)
+	GUESS=$UNAME_MACHINE-pc-fiwix
+	;;
     *:AROS:*:*)
 	GUESS=$UNAME_MACHINE-unknown-aros
 	;;
@@ -1533,6 +1594,9 @@
 	;;
     *:Unleashed:*:*)
 	GUESS=$UNAME_MACHINE-unknown-unleashed$UNAME_RELEASE
+	;;
+    *:Ironclad:*:*)
+	GUESS=$UNAME_MACHINE-unknown-ironclad
 	;;
 esac
 
diff --git a/config.sub b/config.sub
--- a/config.sub
+++ b/config.sub
@@ -1,14 +1,14 @@
 #! /bin/sh
 # Configuration validation subroutine script.
-#   Copyright 1992-2021 Free Software Foundation, Inc.
+#   Copyright 1992-2024 Free Software Foundation, Inc.
 
 # shellcheck disable=SC2006,SC2268 # see below for rationale
 
-timestamp='2021-08-14'
+timestamp='2024-01-01'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3 of the License, or
+# the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful, but
@@ -76,13 +76,13 @@
 version="\
 GNU config.sub ($timestamp)
 
-Copyright 1992-2021 Free Software Foundation, Inc.
+Copyright 1992-2024 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
 
 help="
-Try \`$me --help' for more information."
+Try '$me --help' for more information."
 
 # Parse command line
 while test $# -gt 0 ; do
@@ -130,7 +130,7 @@
 # Separate into logical components for further validation
 case $1 in
 	*-*-*-*-*)
-		echo Invalid configuration \`"$1"\': more than four components >&2
+		echo "Invalid configuration '$1': more than four components" >&2
 		exit 1
 		;;
 	*-*-*-*)
@@ -145,7 +145,8 @@
 			nto-qnx* | linux-* | uclinux-uclibc* \
 			| uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* \
 			| netbsd*-eabi* | kopensolaris*-gnu* | cloudabi*-eabi* \
-			| storm-chaos* | os2-emx* | rtmk-nova*)
+			| storm-chaos* | os2-emx* | rtmk-nova* | managarm-* \
+			| windows-* )
 				basic_machine=$field1
 				basic_os=$maybe_os
 				;;
@@ -943,7 +944,7 @@
 EOF
 		IFS=$saved_IFS
 		;;
-	# We use `pc' rather than `unknown'
+	# We use 'pc' rather than 'unknown'
 	# because (1) that's what they normally are, and
 	# (2) the word "unknown" tends to confuse beginning users.
 	i*86 | x86_64)
@@ -1020,6 +1021,11 @@
 		;;
 
 	# Here we normalize CPU types with a missing or matching vendor
+	armh-unknown | armh-alt)
+		cpu=armv7l
+		vendor=alt
+		basic_os=${basic_os:-linux-gnueabihf}
+		;;
 	dpx20-unknown | dpx20-bull)
 		cpu=rs6000
 		vendor=bull
@@ -1070,7 +1076,7 @@
 	pentium-* | p5-* | k5-* | k6-* | nexgen-* | viac3-*)
 		cpu=i586
 		;;
-	pentiumpro-* | p6-* | 6x86-* | athlon-* | athalon_*-*)
+	pentiumpro-* | p6-* | 6x86-* | athlon-* | athlon_*-*)
 		cpu=i686
 		;;
 	pentiumii-* | pentium2-* | pentiumiii-* | pentium3-*)
@@ -1121,7 +1127,7 @@
 	xscale-* | xscalee[bl]-*)
 		cpu=`echo "$cpu" | sed 's/^xscale/arm/'`
 		;;
-	arm64-*)
+	arm64-* | aarch64le-*)
 		cpu=aarch64
 		;;
 
@@ -1175,7 +1181,7 @@
 		case $cpu in
 			1750a | 580 \
 			| a29k \
-			| aarch64 | aarch64_be \
+			| aarch64 | aarch64_be | aarch64c | arm64ec \
 			| abacus \
 			| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] \
 			| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] \
@@ -1194,51 +1200,29 @@
 			| d10v | d30v | dlx | dsp16xx \
 			| e2k | elxsi | epiphany \
 			| f30[01] | f700 | fido | fr30 | frv | ft32 | fx80 \
+			| javascript \
 			| h8300 | h8500 \
 			| hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 			| hexagon \
 			| i370 | i*86 | i860 | i960 | ia16 | ia64 \
 			| ip2k | iq2000 \
-            | js \
 			| k1om \
+			| kvx \
 			| le32 | le64 \
 			| lm32 \
-			| loongarch32 | loongarch64 | loongarchx32 \
+			| loongarch32 | loongarch64 \
 			| m32c | m32r | m32rle \
 			| m5200 | m68000 | m680[012346]0 | m68360 | m683?2 | m68k \
 			| m6811 | m68hc11 | m6812 | m68hc12 | m68hcs12x \
 			| m88110 | m88k | maxq | mb | mcore | mep | metag \
 			| microblaze | microblazeel \
-			| mips | mipsbe | mipseb | mipsel | mipsle \
-			| mips16 \
-			| mips64 | mips64eb | mips64el \
-			| mips64octeon | mips64octeonel \
-			| mips64orion | mips64orionel \
-			| mips64r5900 | mips64r5900el \
-			| mips64vr | mips64vrel \
-			| mips64vr4100 | mips64vr4100el \
-			| mips64vr4300 | mips64vr4300el \
-			| mips64vr5000 | mips64vr5000el \
-			| mips64vr5900 | mips64vr5900el \
-			| mipsisa32 | mipsisa32el \
-			| mipsisa32r2 | mipsisa32r2el \
-			| mipsisa32r3 | mipsisa32r3el \
-			| mipsisa32r5 | mipsisa32r5el \
-			| mipsisa32r6 | mipsisa32r6el \
-			| mipsisa64 | mipsisa64el \
-			| mipsisa64r2 | mipsisa64r2el \
-			| mipsisa64r3 | mipsisa64r3el \
-			| mipsisa64r5 | mipsisa64r5el \
-			| mipsisa64r6 | mipsisa64r6el \
-			| mipsisa64sb1 | mipsisa64sb1el \
-			| mipsisa64sr71k | mipsisa64sr71kel \
-			| mipsr5900 | mipsr5900el \
-			| mipstx39 | mipstx39el \
+			| mips* \
 			| mmix \
 			| mn10200 | mn10300 \
 			| moxie \
 			| mt \
 			| msp430 \
+			| nanomips* \
 			| nds32 | nds32le | nds32be \
 			| nfp \
 			| nios | nios2 | nios2eb | nios2el \
@@ -1270,6 +1254,7 @@
 			| ubicom32 \
 			| v70 | v850 | v850e | v850e1 | v850es | v850e2 | v850e2v3 \
 			| vax \
+			| vc4 \
 			| visium \
 			| w65 \
 			| wasm32 | wasm64 \
@@ -1281,7 +1266,7 @@
 				;;
 
 			*)
-				echo Invalid configuration \`"$1"\': machine \`"$cpu-$vendor"\' not recognized 1>&2
+				echo "Invalid configuration '$1': machine '$cpu-$vendor' not recognized" 1>&2
 				exit 1
 				;;
 		esac
@@ -1302,11 +1287,12 @@
 
 # Decode manufacturer-specific aliases for certain operating systems.
 
-if test x$basic_os != x
+if test x"$basic_os" != x
 then
 
-# First recognize some ad-hoc caes, or perhaps split kernel-os, or else just
+# First recognize some ad-hoc cases, or perhaps split kernel-os, or else just
 # set os.
+obj=
 case $basic_os in
 	gnu/linux*)
 		kernel=linux
@@ -1337,6 +1323,10 @@
 		kernel=linux
 		os=`echo "$basic_os" | sed -e 's|linux|gnu|'`
 		;;
+	managarm*)
+		kernel=managarm
+		os=`echo "$basic_os" | sed -e 's|managarm|mlibc|'`
+		;;
 	*)
 		kernel=
 		os=$basic_os
@@ -1502,10 +1492,16 @@
 			os=eabi
 			;;
 		    *)
-			os=elf
+			os=
+			obj=elf
 			;;
 		esac
 		;;
+	aout* | coff* | elf* | pe*)
+		# These are machine code file formats, not OSes
+		obj=$os
+		os=
+		;;
 	*)
 		# No normalization, but not necessarily accepted, that comes below.
 		;;
@@ -1524,12 +1520,15 @@
 # system, and we'll never get to this point.
 
 kernel=
+obj=
 case $cpu-$vendor in
 	score-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	spu-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	*-acorn)
 		os=riscix1.2
@@ -1539,28 +1538,35 @@
 		os=gnu
 		;;
 	arm*-semi)
-		os=aout
+		os=
+		obj=aout
 		;;
 	c4x-* | tic4x-*)
-		os=coff
+		os=
+		obj=coff
 		;;
 	c8051-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	clipper-intergraph)
 		os=clix
 		;;
 	hexagon-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	tic54x-*)
-		os=coff
+		os=
+		obj=coff
 		;;
 	tic55x-*)
-		os=coff
+		os=
+		obj=coff
 		;;
 	tic6x-*)
-		os=coff
+		os=
+		obj=coff
 		;;
 	# This must come before the *-dec entry.
 	pdp10-*)
@@ -1582,19 +1588,24 @@
 		os=sunos3
 		;;
 	m68*-cisco)
-		os=aout
+		os=
+		obj=aout
 		;;
 	mep-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	mips*-cisco)
-		os=elf
+		os=
+		obj=elf
 		;;
-	mips*-*)
-		os=elf
+	mips*-*|nanomips*-*)
+		os=
+		obj=elf
 		;;
 	or32-*)
-		os=coff
+		os=
+		obj=coff
 		;;
 	*-tti)	# must be before sparc entry or we get the wrong os.
 		os=sysv3
@@ -1603,7 +1614,8 @@
 		os=sunos4.1.1
 		;;
 	pru-*)
-		os=elf
+		os=
+		obj=elf
 		;;
 	*-be)
 		os=beos
@@ -1684,10 +1696,12 @@
 		os=uxpv
 		;;
 	*-rom68k)
-		os=coff
+		os=
+		obj=coff
 		;;
 	*-*bug)
-		os=coff
+		os=
+		obj=coff
 		;;
 	*-apple)
 		os=macos
@@ -1705,10 +1719,11 @@
 
 fi
 
-# Now, validate our (potentially fixed-up) OS.
+# Now, validate our (potentially fixed-up) individual pieces (OS, OBJ).
+
 case $os in
 	# Sometimes we do "kernel-libc", so those need to count as OSes.
-	musl* | newlib* | relibc* | uclibc*)
+	llvm* | musl* | newlib* | relibc* | uclibc*)
 		;;
 	# Likewise for "kernel-abi"
 	eabi* | gnueabi*)
@@ -1716,6 +1731,9 @@
 	# VxWorks passes extra cpu info in the 4th filed.
 	simlinux | simwindows | spe)
 		;;
+	# See `case $cpu-$os` validation below
+	ghcjs)
+		;;
 	# Now accept the basic system types.
 	# The portable systems comes first.
 	# Each alternative MUST end in a * to match a version number.
@@ -1724,7 +1742,7 @@
 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
 	     | sym* |  plan9* | psp* | sim* | xray* | os68k* | v88r* \
 	     | hiux* | abug | nacl* | netware* | windows* \
-	     | os9* | macos* | osx* | ios* \
+	     | os9* | macos* | osx* | ios* | tvos* | watchos* \
 	     | mpw* | magic* | mmixware* | mon960* | lnews* \
 	     | amigaos* | amigados* | msdos* | newsos* | unicos* | aof* \
 	     | aos* | aros* | cloudabi* | sortix* | twizzler* \
@@ -1733,11 +1751,11 @@
 	     | mirbsd* | netbsd* | dicos* | openedition* | ose* \
 	     | bitrig* | openbsd* | secbsd* | solidbsd* | libertybsd* | os108* \
 	     | ekkobsd* | freebsd* | riscix* | lynxos* | os400* \
-	     | bosx* | nextstep* | cxux* | aout* | elf* | oabi* \
-	     | ptx* | coff* | ecoff* | winnt* | domain* | vsta* \
+	     | bosx* | nextstep* | cxux* | oabi* \
+	     | ptx* | ecoff* | winnt* | domain* | vsta* \
 	     | udi* | lites* | ieee* | go32* | aux* | hcos* \
 	     | chorusrdb* | cegcc* | glidix* | serenity* \
-	     | cygwin* | msys* | pe* | moss* | proelf* | rtems* \
+	     | cygwin* | msys* | moss* | proelf* | rtems* \
 	     | midipix* | mingw32* | mingw64* | mint* \
 	     | uxpv* | beos* | mpeix* | udk* | moxiebox* \
 	     | interix* | uwin* | mks* | rhapsody* | darwin* \
@@ -1750,49 +1768,116 @@
 	     | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
 	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
 	     | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
-         | ghcjs)
+	     | fiwix* | mlibc* | cos* | mbr* | ironclad* )
 		;;
 	# This one is extra strict with allowed versions
 	sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
 		# Don't forget version if it is 3.2v4 or newer.
 		;;
+	# This refers to builds using the UEFI calling convention
+	# (which depends on the architecture) and PE file format.
+	# Note that this is both a different calling convention and
+	# different file format than that of GNU-EFI
+	# (x86_64-w64-mingw32).
+	uefi)
+		;;
 	none)
 		;;
+	kernel* | msvc* )
+		# Restricted further below
+		;;
+	'')
+		if test x"$obj" = x
+		then
+			echo "Invalid configuration '$1': Blank OS only allowed with explicit machine code file format" 1>&2
+		fi
+		;;
 	*)
-		echo Invalid configuration \`"$1"\': OS \`"$os"\' not recognized 1>&2
+		echo "Invalid configuration '$1': OS '$os' not recognized" 1>&2
 		exit 1
 		;;
 esac
 
+case $obj in
+	aout* | coff* | elf* | pe*)
+		;;
+	'')
+		# empty is fine
+		;;
+	*)
+		echo "Invalid configuration '$1': Machine code format '$obj' not recognized" 1>&2
+		exit 1
+		;;
+esac
+
+# Here we handle the constraint that a (synthetic) cpu and os are
+# valid only in combination with each other and nowhere else.
+case $cpu-$os in
+	# The "javascript-unknown-ghcjs" triple is used by GHC; we
+	# accept it here in order to tolerate that, but reject any
+	# variations.
+	javascript-ghcjs)
+		;;
+	javascript-* | *-ghcjs)
+		echo "Invalid configuration '$1': cpu '$cpu' is not valid with os '$os$obj'" 1>&2
+		exit 1
+		;;
+esac
+
 # As a final step for OS-related things, validate the OS-kernel combination
 # (given a valid OS), if there is a kernel.
-case $kernel-$os in
-	linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib* \
-		   | linux-musl* | linux-relibc* | linux-uclibc* )
+case $kernel-$os-$obj in
+	linux-gnu*- | linux-android*- | linux-dietlibc*- | linux-llvm*- \
+		    | linux-mlibc*- | linux-musl*- | linux-newlib*- \
+		    | linux-relibc*- | linux-uclibc*- )
 		;;
-	uclinux-uclibc* )
+	uclinux-uclibc*- )
 		;;
-	-dietlibc* | -newlib* | -musl* | -relibc* | -uclibc* )
+	managarm-mlibc*- | managarm-kernel*- )
+		;;
+	windows*-msvc*-)
+		;;
+	-dietlibc*- | -llvm*- | -mlibc*- | -musl*- | -newlib*- | -relibc*- \
+		    | -uclibc*- )
 		# These are just libc implementations, not actual OSes, and thus
 		# require a kernel.
-		echo "Invalid configuration \`$1': libc \`$os' needs explicit kernel." 1>&2
+		echo "Invalid configuration '$1': libc '$os' needs explicit kernel." 1>&2
 		exit 1
 		;;
-	kfreebsd*-gnu* | kopensolaris*-gnu*)
+	-kernel*- )
+		echo "Invalid configuration '$1': '$os' needs explicit kernel." 1>&2
+		exit 1
 		;;
-	vxworks-simlinux | vxworks-simwindows | vxworks-spe)
+	*-kernel*- )
+		echo "Invalid configuration '$1': '$kernel' does not support '$os'." 1>&2
+		exit 1
 		;;
-	nto-qnx*)
+	*-msvc*- )
+		echo "Invalid configuration '$1': '$os' needs 'windows'." 1>&2
+		exit 1
 		;;
-	os2-emx)
+	kfreebsd*-gnu*- | kopensolaris*-gnu*-)
 		;;
-	*-eabi* | *-gnueabi*)
+	vxworks-simlinux- | vxworks-simwindows- | vxworks-spe-)
 		;;
-	-*)
+	nto-qnx*-)
+		;;
+	os2-emx-)
+		;;
+	*-eabi*- | *-gnueabi*-)
+		;;
+	none--*)
+		# None (no kernel, i.e. freestanding / bare metal),
+		# can be paired with an machine code file format
+		;;
+	-*-)
 		# Blank kernel with real OS is always fine.
 		;;
-	*-*)
-		echo "Invalid configuration \`$1': Kernel \`$kernel' not known to work with OS \`$os'." 1>&2
+	--*)
+		# Blank kernel and OS with real machine code file format is always fine.
+		;;
+	*-*-*)
+		echo "Invalid configuration '$1': Kernel '$kernel' not known to work with OS '$os'." 1>&2
 		exit 1
 		;;
 esac
@@ -1875,7 +1960,7 @@
 		;;
 esac
 
-echo "$cpu-$vendor-${kernel:+$kernel-}$os"
+echo "$cpu-$vendor${kernel:+-$kernel}${os:+-$os}${obj:+-$obj}"
 exit
 
 # Local variables:
diff --git a/configure b/configure
--- a/configure
+++ b/configure
@@ -1,4932 +1,5235 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for Haskell network package 3.1.2.9.
-#
-# Report bugs to <libraries@haskell.org>.
-#
-#
-# Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
-#
-#
-# This configure script is free software; the Free Software Foundation
-# gives unlimited permission to copy, distribute and modify it.
-## -------------------- ##
-## M4sh Initialization. ##
-## -------------------- ##
-
-# Be more Bourne compatible
-DUALCASE=1; export DUALCASE # for MKS sh
-if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then :
-  emulate sh
-  NULLCMD=:
-  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
-  # is contrary to our usage.  Disable this feature.
-  alias -g '${1+"$@"}'='"$@"'
-  setopt NO_GLOB_SUBST
-else
-  case `(set -o) 2>/dev/null` in #(
-  *posix*) :
-    set -o posix ;; #(
-  *) :
-     ;;
-esac
-fi
-
-
-as_nl='
-'
-export as_nl
-# Printing a long string crashes Solaris 7 /usr/bin/printf.
-as_echo='\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'
-as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo
-as_echo=$as_echo$as_echo$as_echo$as_echo$as_echo$as_echo
-# Prefer a ksh shell builtin over an external printf program on Solaris,
-# but without wasting forks for bash or zsh.
-if test -z "$BASH_VERSION$ZSH_VERSION" \
-    && (test "X`print -r -- $as_echo`" = "X$as_echo") 2>/dev/null; then
-  as_echo='print -r --'
-  as_echo_n='print -rn --'
-elif (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then
-  as_echo='printf %s\n'
-  as_echo_n='printf %s'
-else
-  if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then
-    as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"'
-    as_echo_n='/usr/ucb/echo -n'
-  else
-    as_echo_body='eval expr "X$1" : "X\\(.*\\)"'
-    as_echo_n_body='eval
-      arg=$1;
-      case $arg in #(
-      *"$as_nl"*)
-	expr "X$arg" : "X\\(.*\\)$as_nl";
-	arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
-      esac;
-      expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
-    '
-    export as_echo_n_body
-    as_echo_n='sh -c $as_echo_n_body as_echo'
-  fi
-  export as_echo_body
-  as_echo='sh -c $as_echo_body as_echo'
-fi
-
-# The user is always right.
-if test "${PATH_SEPARATOR+set}" != set; then
-  PATH_SEPARATOR=:
-  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
-    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
-      PATH_SEPARATOR=';'
-  }
-fi
-
-
-# IFS
-# We need space, tab and new line, in precisely that order.  Quoting is
-# there to prevent editors from complaining about space-tab.
-# (If _AS_PATH_WALK were called with IFS unset, it would disable word
-# splitting by setting IFS to empty value.)
-IFS=" ""	$as_nl"
-
-# Find who we are.  Look in the path if we contain no directory separator.
-as_myself=
-case $0 in #((
-  *[\\/]* ) as_myself=$0 ;;
-  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    test -r "$as_dir/$0" && as_myself=$as_dir/$0 && break
-  done
-IFS=$as_save_IFS
-
-     ;;
-esac
-# We did not find ourselves, most probably we were run as `sh COMMAND'
-# in which case we are not to be found in the path.
-if test "x$as_myself" = x; then
-  as_myself=$0
-fi
-if test ! -f "$as_myself"; then
-  $as_echo "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
-  exit 1
-fi
-
-# Unset variables that we do not need and which cause bugs (e.g. in
-# pre-3.0 UWIN ksh).  But do not cause bugs in bash 2.01; the "|| exit 1"
-# suppresses any "Segmentation fault" message there.  '((' could
-# trigger a bug in pdksh 5.2.14.
-for as_var in BASH_ENV ENV MAIL MAILPATH
-do eval test x\${$as_var+set} = xset \
-  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
-done
-PS1='$ '
-PS2='> '
-PS4='+ '
-
-# NLS nuisances.
-LC_ALL=C
-export LC_ALL
-LANGUAGE=C
-export LANGUAGE
-
-# CDPATH.
-(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
-
-# Use a proper internal environment variable to ensure we don't fall
-  # into an infinite loop, continuously re-executing ourselves.
-  if test x"${_as_can_reexec}" != xno && test "x$CONFIG_SHELL" != x; then
-    _as_can_reexec=no; export _as_can_reexec;
-    # We cannot yet assume a decent shell, so we have to provide a
-# neutralization value for shells without unset; and this also
-# works around shells that cannot unset nonexistent variables.
-# Preserve -v and -x to the replacement shell.
-BASH_ENV=/dev/null
-ENV=/dev/null
-(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
-case $- in # ((((
-  *v*x* | *x*v* ) as_opts=-vx ;;
-  *v* ) as_opts=-v ;;
-  *x* ) as_opts=-x ;;
-  * ) as_opts= ;;
-esac
-exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
-# Admittedly, this is quite paranoid, since all the known shells bail
-# out after a failed `exec'.
-$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
-as_fn_exit 255
-  fi
-  # We don't want this to propagate to other subprocesses.
-          { _as_can_reexec=; unset _as_can_reexec;}
-if test "x$CONFIG_SHELL" = x; then
-  as_bourne_compatible="if test -n \"\${ZSH_VERSION+set}\" && (emulate sh) >/dev/null 2>&1; then :
-  emulate sh
-  NULLCMD=:
-  # Pre-4.2 versions of Zsh do word splitting on \${1+\"\$@\"}, which
-  # is contrary to our usage.  Disable this feature.
-  alias -g '\${1+\"\$@\"}'='\"\$@\"'
-  setopt NO_GLOB_SUBST
-else
-  case \`(set -o) 2>/dev/null\` in #(
-  *posix*) :
-    set -o posix ;; #(
-  *) :
-     ;;
-esac
-fi
-"
-  as_required="as_fn_return () { (exit \$1); }
-as_fn_success () { as_fn_return 0; }
-as_fn_failure () { as_fn_return 1; }
-as_fn_ret_success () { return 0; }
-as_fn_ret_failure () { return 1; }
-
-exitcode=0
-as_fn_success || { exitcode=1; echo as_fn_success failed.; }
-as_fn_failure && { exitcode=1; echo as_fn_failure succeeded.; }
-as_fn_ret_success || { exitcode=1; echo as_fn_ret_success failed.; }
-as_fn_ret_failure && { exitcode=1; echo as_fn_ret_failure succeeded.; }
-if ( set x; as_fn_ret_success y && test x = \"\$1\" ); then :
-
-else
-  exitcode=1; echo positional parameters were not saved.
-fi
-test x\$exitcode = x0 || exit 1
-test -x / || exit 1"
-  as_suggested="  as_lineno_1=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_1a=\$LINENO
-  as_lineno_2=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_2a=\$LINENO
-  eval 'test \"x\$as_lineno_1'\$as_run'\" != \"x\$as_lineno_2'\$as_run'\" &&
-  test \"x\`expr \$as_lineno_1'\$as_run' + 1\`\" = \"x\$as_lineno_2'\$as_run'\"' || exit 1
-test \$(( 1 + 1 )) = 2 || exit 1"
-  if (eval "$as_required") 2>/dev/null; then :
-  as_have_required=yes
-else
-  as_have_required=no
-fi
-  if test x$as_have_required = xyes && (eval "$as_suggested") 2>/dev/null; then :
-
-else
-  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-as_found=false
-for as_dir in /bin$PATH_SEPARATOR/usr/bin$PATH_SEPARATOR$PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-  as_found=:
-  case $as_dir in #(
-	 /*)
-	   for as_base in sh bash ksh sh5; do
-	     # Try only shells that exist, to save several forks.
-	     as_shell=$as_dir/$as_base
-	     if { test -f "$as_shell" || test -f "$as_shell.exe"; } &&
-		    { $as_echo "$as_bourne_compatible""$as_required" | as_run=a "$as_shell"; } 2>/dev/null; then :
-  CONFIG_SHELL=$as_shell as_have_required=yes
-		   if { $as_echo "$as_bourne_compatible""$as_suggested" | as_run=a "$as_shell"; } 2>/dev/null; then :
-  break 2
-fi
-fi
-	   done;;
-       esac
-  as_found=false
-done
-$as_found || { if { test -f "$SHELL" || test -f "$SHELL.exe"; } &&
-	      { $as_echo "$as_bourne_compatible""$as_required" | as_run=a "$SHELL"; } 2>/dev/null; then :
-  CONFIG_SHELL=$SHELL as_have_required=yes
-fi; }
-IFS=$as_save_IFS
-
-
-      if test "x$CONFIG_SHELL" != x; then :
-  export CONFIG_SHELL
-             # We cannot yet assume a decent shell, so we have to provide a
-# neutralization value for shells without unset; and this also
-# works around shells that cannot unset nonexistent variables.
-# Preserve -v and -x to the replacement shell.
-BASH_ENV=/dev/null
-ENV=/dev/null
-(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
-case $- in # ((((
-  *v*x* | *x*v* ) as_opts=-vx ;;
-  *v* ) as_opts=-v ;;
-  *x* ) as_opts=-x ;;
-  * ) as_opts= ;;
-esac
-exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
-# Admittedly, this is quite paranoid, since all the known shells bail
-# out after a failed `exec'.
-$as_echo "$0: could not re-execute with $CONFIG_SHELL" >&2
-exit 255
-fi
-
-    if test x$as_have_required = xno; then :
-  $as_echo "$0: This script requires a shell more modern than all"
-  $as_echo "$0: the shells that I found on your system."
-  if test x${ZSH_VERSION+set} = xset ; then
-    $as_echo "$0: In particular, zsh $ZSH_VERSION has bugs and should"
-    $as_echo "$0: be upgraded to zsh 4.3.4 or later."
-  else
-    $as_echo "$0: Please tell bug-autoconf@gnu.org and
-$0: libraries@haskell.org about your system, including any
-$0: error possibly output before this message. Then install
-$0: a modern shell, or manually run the script under such a
-$0: shell if you do have one."
-  fi
-  exit 1
-fi
-fi
-fi
-SHELL=${CONFIG_SHELL-/bin/sh}
-export SHELL
-# Unset more variables known to interfere with behavior of common tools.
-CLICOLOR_FORCE= GREP_OPTIONS=
-unset CLICOLOR_FORCE GREP_OPTIONS
-
-## --------------------- ##
-## M4sh Shell Functions. ##
-## --------------------- ##
-# as_fn_unset VAR
-# ---------------
-# Portably unset VAR.
-as_fn_unset ()
-{
-  { eval $1=; unset $1;}
-}
-as_unset=as_fn_unset
-
-# as_fn_set_status STATUS
-# -----------------------
-# Set $? to STATUS, without forking.
-as_fn_set_status ()
-{
-  return $1
-} # as_fn_set_status
-
-# as_fn_exit STATUS
-# -----------------
-# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
-as_fn_exit ()
-{
-  set +e
-  as_fn_set_status $1
-  exit $1
-} # as_fn_exit
-
-# as_fn_mkdir_p
-# -------------
-# Create "$as_dir" as a directory, including parents if necessary.
-as_fn_mkdir_p ()
-{
-
-  case $as_dir in #(
-  -*) as_dir=./$as_dir;;
-  esac
-  test -d "$as_dir" || eval $as_mkdir_p || {
-    as_dirs=
-    while :; do
-      case $as_dir in #(
-      *\'*) as_qdir=`$as_echo "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
-      *) as_qdir=$as_dir;;
-      esac
-      as_dirs="'$as_qdir' $as_dirs"
-      as_dir=`$as_dirname -- "$as_dir" ||
-$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
-	 X"$as_dir" : 'X\(//\)[^/]' \| \
-	 X"$as_dir" : 'X\(//\)$' \| \
-	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X"$as_dir" |
-    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)[^/].*/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-      test -d "$as_dir" && break
-    done
-    test -z "$as_dirs" || eval "mkdir $as_dirs"
-  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
-
-
-} # as_fn_mkdir_p
-
-# as_fn_executable_p FILE
-# -----------------------
-# Test if FILE is an executable regular file.
-as_fn_executable_p ()
-{
-  test -f "$1" && test -x "$1"
-} # as_fn_executable_p
-# as_fn_append VAR VALUE
-# ----------------------
-# Append the text in VALUE to the end of the definition contained in VAR. Take
-# advantage of any shell optimizations that allow amortized linear growth over
-# repeated appends, instead of the typical quadratic growth present in naive
-# implementations.
-if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null; then :
-  eval 'as_fn_append ()
-  {
-    eval $1+=\$2
-  }'
-else
-  as_fn_append ()
-  {
-    eval $1=\$$1\$2
-  }
-fi # as_fn_append
-
-# as_fn_arith ARG...
-# ------------------
-# Perform arithmetic evaluation on the ARGs, and store the result in the
-# global $as_val. Take advantage of shells that can avoid forks. The arguments
-# must be portable across $(()) and expr.
-if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null; then :
-  eval 'as_fn_arith ()
-  {
-    as_val=$(( $* ))
-  }'
-else
-  as_fn_arith ()
-  {
-    as_val=`expr "$@" || test $? -eq 1`
-  }
-fi # as_fn_arith
-
-
-# as_fn_error STATUS ERROR [LINENO LOG_FD]
-# ----------------------------------------
-# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
-# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
-# script with STATUS, using 1 if that was 0.
-as_fn_error ()
-{
-  as_status=$1; test $as_status -eq 0 && as_status=1
-  if test "$4"; then
-    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-    $as_echo "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
-  fi
-  $as_echo "$as_me: error: $2" >&2
-  as_fn_exit $as_status
-} # as_fn_error
-
-if expr a : '\(a\)' >/dev/null 2>&1 &&
-   test "X`expr 00001 : '.*\(...\)'`" = X001; then
-  as_expr=expr
-else
-  as_expr=false
-fi
-
-if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
-  as_basename=basename
-else
-  as_basename=false
-fi
-
-if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
-  as_dirname=dirname
-else
-  as_dirname=false
-fi
-
-as_me=`$as_basename -- "$0" ||
-$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
-	 X"$0" : 'X\(//\)$' \| \
-	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X/"$0" |
-    sed '/^.*\/\([^/][^/]*\)\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\/\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\/\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-
-# Avoid depending upon Character Ranges.
-as_cr_letters='abcdefghijklmnopqrstuvwxyz'
-as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-as_cr_Letters=$as_cr_letters$as_cr_LETTERS
-as_cr_digits='0123456789'
-as_cr_alnum=$as_cr_Letters$as_cr_digits
-
-
-  as_lineno_1=$LINENO as_lineno_1a=$LINENO
-  as_lineno_2=$LINENO as_lineno_2a=$LINENO
-  eval 'test "x$as_lineno_1'$as_run'" != "x$as_lineno_2'$as_run'" &&
-  test "x`expr $as_lineno_1'$as_run' + 1`" = "x$as_lineno_2'$as_run'"' || {
-  # Blame Lee E. McMahon (1931-1989) for sed's syntax.  :-)
-  sed -n '
-    p
-    /[$]LINENO/=
-  ' <$as_myself |
-    sed '
-      s/[$]LINENO.*/&-/
-      t lineno
-      b
-      :lineno
-      N
-      :loop
-      s/[$]LINENO\([^'$as_cr_alnum'_].*\n\)\(.*\)/\2\1\2/
-      t loop
-      s/-\n.*//
-    ' >$as_me.lineno &&
-  chmod +x "$as_me.lineno" ||
-    { $as_echo "$as_me: error: cannot create $as_me.lineno; rerun with a POSIX shell" >&2; as_fn_exit 1; }
-
-  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
-  # already done that, so ensure we don't try to do so again and fall
-  # in an infinite loop.  This has already happened in practice.
-  _as_can_reexec=no; export _as_can_reexec
-  # Don't try to exec as it changes $[0], causing all sort of problems
-  # (the dirname of $[0] is not the place where we might find the
-  # original and so on.  Autoconf is especially sensitive to this).
-  . "./$as_me.lineno"
-  # Exit status is that of the last command.
-  exit
-}
-
-ECHO_C= ECHO_N= ECHO_T=
-case `echo -n x` in #(((((
--n*)
-  case `echo 'xy\c'` in
-  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
-  xy)  ECHO_C='\c';;
-  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
-       ECHO_T='	';;
-  esac;;
-*)
-  ECHO_N='-n';;
-esac
-
-rm -f conf$$ conf$$.exe conf$$.file
-if test -d conf$$.dir; then
-  rm -f conf$$.dir/conf$$.file
-else
-  rm -f conf$$.dir
-  mkdir conf$$.dir 2>/dev/null
-fi
-if (echo >conf$$.file) 2>/dev/null; then
-  if ln -s conf$$.file conf$$ 2>/dev/null; then
-    as_ln_s='ln -s'
-    # ... but there are two gotchas:
-    # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
-    # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
-    # In both cases, we have to default to `cp -pR'.
-    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
-      as_ln_s='cp -pR'
-  elif ln conf$$.file conf$$ 2>/dev/null; then
-    as_ln_s=ln
-  else
-    as_ln_s='cp -pR'
-  fi
-else
-  as_ln_s='cp -pR'
-fi
-rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
-rmdir conf$$.dir 2>/dev/null
-
-if mkdir -p . 2>/dev/null; then
-  as_mkdir_p='mkdir -p "$as_dir"'
-else
-  test -d ./-p && rmdir ./-p
-  as_mkdir_p=false
-fi
-
-as_test_x='test -x'
-as_executable_p=as_fn_executable_p
-
-# Sed expression to map a string onto a valid CPP name.
-as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
-
-# Sed expression to map a string onto a valid variable name.
-as_tr_sh="eval sed 'y%*+%pp%;s%[^_$as_cr_alnum]%_%g'"
-
-
-test -n "$DJDIR" || exec 7<&0 </dev/null
-exec 6>&1
-
-# Name of the host.
-# hostname on some systems (SVR3.2, old GNU/Linux) returns a bogus exit status,
-# so uname gets run too.
-ac_hostname=`(hostname || uname -n) 2>/dev/null | sed 1q`
-
-#
-# Initializations.
-#
-ac_default_prefix=/usr/local
-ac_clean_files=
-ac_config_libobj_dir=.
-LIBOBJS=
-cross_compiling=no
-subdirs=
-MFLAGS=
-MAKEFLAGS=
-
-# Identity of this package.
-PACKAGE_NAME='Haskell network package'
-PACKAGE_TARNAME='network'
-PACKAGE_VERSION='3.1.2.9'
-PACKAGE_STRING='Haskell network package 3.1.2.9'
-PACKAGE_BUGREPORT='libraries@haskell.org'
-PACKAGE_URL=''
-
-ac_unique_file="include/HsNet.h"
-# Factoring default headers for most tests.
-ac_includes_default="\
-#include <stdio.h>
-#ifdef HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-#ifdef HAVE_SYS_STAT_H
-# include <sys/stat.h>
-#endif
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#else
-# ifdef HAVE_STDLIB_H
-#  include <stdlib.h>
-# endif
-#endif
-#ifdef HAVE_STRING_H
-# if !defined STDC_HEADERS && defined HAVE_MEMORY_H
-#  include <memory.h>
-# endif
-# include <string.h>
-#endif
-#ifdef HAVE_STRINGS_H
-# include <strings.h>
-#endif
-#ifdef HAVE_INTTYPES_H
-# include <inttypes.h>
-#endif
-#ifdef HAVE_STDINT_H
-# include <stdint.h>
-#endif
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif"
-
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-\`configure' configures Haskell network package 3.1.2.9 to adapt to many kinds of systems.
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-Usage: $0 [OPTION]... [VAR=VALUE]...
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-System types:
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-Some influential environment variables:
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-else
-  ac_cv_path_GREP=$GREP
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
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-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
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-*)
-  ac_count=0
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-    as_fn_arith $ac_count + 1 && ac_count=$as_val
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-  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
-esac
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-      $ac_path_EGREP_found && break 3
-    done
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-IFS=$as_save_IFS
-  if test -z "$ac_cv_path_EGREP"; then
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-else
-  ac_cv_path_EGREP=$EGREP
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-
-   fi
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
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- EGREP="$ac_cv_path_EGREP"
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
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-if ${ac_cv_header_stdc+:} false; then :
-  $as_echo_n "(cached) " >&6
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-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <float.h>
-
-int
-main ()
-{
-
-  ;
-  return 0;
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-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
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-/* end confdefs.h.  */
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-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
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-rm -f conftest*
-
-fi
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-if test $ac_cv_header_stdc = yes; then
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-/* end confdefs.h.  */
-#include <stdlib.h>
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-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
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-rm -f conftest*
-
-fi
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-if test $ac_cv_header_stdc = yes; then
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-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#include <ctype.h>
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-# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
-#else
-# define ISLOWER(c) \
-		   (('a' <= (c) && (c) <= 'i') \
-		     || ('j' <= (c) && (c) <= 'r') \
-		     || ('s' <= (c) && (c) <= 'z'))
-# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
-#endif
-
-#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
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-{
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-
-fi
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-$as_echo "#define STDC_HEADERS 1" >>confdefs.h
-
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-_ACEOF
-
-fi
-
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-
-for ac_header in limits.h stdlib.h unistd.h sys/types.h fcntl.h
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-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-
-done
-
-for ac_header in sys/uio.h sys/socket.h netinet/in.h netinet/tcp.h
-do :
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-ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
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-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
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-for ac_header in sys/un.h arpa/inet.h netdb.h
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-
-fi
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-for ac_header in net/if.h netioapi.h
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-#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-
-done
-
-
-ac_fn_c_check_type "$LINENO" "struct ucred" "ac_cv_type_struct_ucred" "$ac_includes_default"
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_STRUCT_UCRED 1
-_ACEOF
-
-
-fi
-
-
-for ac_func in gai_strerror gethostent accept4
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-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
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-for ac_func in getpeereid
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-  cat >>confdefs.h <<_ACEOF
-#define HAVE_GETPEEREID 1
-_ACEOF
-
-fi
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-
-ac_fn_c_check_decl "$LINENO" "AI_ADDRCONFIG" "ac_cv_have_decl_AI_ADDRCONFIG" "$ac_includes_default"
-if test "x$ac_cv_have_decl_AI_ADDRCONFIG" = xyes; then :
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_AI_ADDRCONFIG $ac_have_decl
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-ac_fn_c_check_decl "$LINENO" "AI_ALL" "ac_cv_have_decl_AI_ALL" "$ac_includes_default"
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-  ac_have_decl=0
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_AI_ALL $ac_have_decl
-_ACEOF
-ac_fn_c_check_decl "$LINENO" "AI_NUMERICSERV" "ac_cv_have_decl_AI_NUMERICSERV" "$ac_includes_default"
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-  ac_have_decl=1
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-  ac_have_decl=0
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_AI_NUMERICSERV $ac_have_decl
-_ACEOF
-ac_fn_c_check_decl "$LINENO" "AI_V4MAPPED" "ac_cv_have_decl_AI_V4MAPPED" "$ac_includes_default"
-if test "x$ac_cv_have_decl_AI_V4MAPPED" = xyes; then :
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-  ac_have_decl=0
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_AI_V4MAPPED $ac_have_decl
-_ACEOF
-
-ac_fn_c_check_decl "$LINENO" "IPV6_V6ONLY" "ac_cv_have_decl_IPV6_V6ONLY" "$ac_includes_default"
-if test "x$ac_cv_have_decl_IPV6_V6ONLY" = xyes; then :
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-  ac_have_decl=0
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_IPV6_V6ONLY $ac_have_decl
-_ACEOF
-
-ac_fn_c_check_decl "$LINENO" "IPPROTO_IP" "ac_cv_have_decl_IPPROTO_IP" "$ac_includes_default"
-if test "x$ac_cv_have_decl_IPPROTO_IP" = xyes; then :
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-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_IPPROTO_IP $ac_have_decl
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_IPPROTO_TCP $ac_have_decl
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-ac_fn_c_check_decl "$LINENO" "IPPROTO_IPV6" "ac_cv_have_decl_IPPROTO_IPV6" "$ac_includes_default"
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_IPPROTO_IPV6 $ac_have_decl
-_ACEOF
-
-ac_fn_c_check_decl "$LINENO" "SO_PEERCRED" "ac_cv_have_decl_SO_PEERCRED" "$ac_includes_default"
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_DECL_SO_PEERCRED $ac_have_decl
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-
-
-ac_fn_c_check_member "$LINENO" "struct msghdr" "msg_control" "ac_cv_member_struct_msghdr_msg_control" "$ac_includes_default"
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_STRUCT_MSGHDR_MSG_CONTROL 1
-_ACEOF
-
-
-fi
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS 1
-_ACEOF
-
-
-fi
-
-ac_fn_c_check_member "$LINENO" "struct sockaddr" "sa_len" "ac_cv_member_struct_sockaddr_sa_len" "$ac_includes_default"
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-cat >>confdefs.h <<_ACEOF
-#define HAVE_STRUCT_SOCKADDR_SA_LEN 1
-_ACEOF
-
-
-fi
-
-
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-done
-LIBOBJS=$ac_libobjs
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-LTLIBOBJS=$ac_ltlibobjs
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-
-
-: "${CONFIG_STATUS=./config.status}"
-ac_write_fail=0
-ac_clean_files_save=$ac_clean_files
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-#! $SHELL
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-debug=false
-ac_cs_recheck=false
-ac_cs_silent=false
-
-SHELL=\${CONFIG_SHELL-$SHELL}
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-cat >>$CONFIG_STATUS <<\_ASEOF || as_write_fail=1
-## -------------------- ##
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-if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then :
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-as_nl='
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-# but without wasting forks for bash or zsh.
-if test -z "$BASH_VERSION$ZSH_VERSION" \
-    && (test "X`print -r -- $as_echo`" = "X$as_echo") 2>/dev/null; then
-  as_echo='print -r --'
-  as_echo_n='print -rn --'
-elif (test "X`printf %s $as_echo`" = "X$as_echo") 2>/dev/null; then
-  as_echo='printf %s\n'
-  as_echo_n='printf %s'
-else
-  if test "X`(/usr/ucb/echo -n -n $as_echo) 2>/dev/null`" = "X-n $as_echo"; then
-    as_echo_body='eval /usr/ucb/echo -n "$1$as_nl"'
-    as_echo_n='/usr/ucb/echo -n'
-  else
-    as_echo_body='eval expr "X$1" : "X\\(.*\\)"'
-    as_echo_n_body='eval
-      arg=$1;
-      case $arg in #(
-      *"$as_nl"*)
-	expr "X$arg" : "X\\(.*\\)$as_nl";
-	arg=`expr "X$arg" : ".*$as_nl\\(.*\\)"`;;
-      esac;
-      expr "X$arg" : "X\\(.*\\)" | tr -d "$as_nl"
-    '
-    export as_echo_n_body
-    as_echo_n='sh -c $as_echo_n_body as_echo'
-  fi
-  export as_echo_body
-  as_echo='sh -c $as_echo_body as_echo'
-fi
-
-# The user is always right.
-if test "${PATH_SEPARATOR+set}" != set; then
-  PATH_SEPARATOR=:
-  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
-    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
-      PATH_SEPARATOR=';'
-  }
-fi
-
-
-# IFS
-# We need space, tab and new line, in precisely that order.  Quoting is
-# there to prevent editors from complaining about space-tab.
-# (If _AS_PATH_WALK were called with IFS unset, it would disable word
-# splitting by setting IFS to empty value.)
-IFS=" ""	$as_nl"
-
-# Find who we are.  Look in the path if we contain no directory separator.
-as_myself=
-case $0 in #((
-  *[\\/]* ) as_myself=$0 ;;
-  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
-for as_dir in $PATH
-do
-  IFS=$as_save_IFS
-  test -z "$as_dir" && as_dir=.
-    test -r "$as_dir/$0" && as_myself=$as_dir/$0 && break
-  done
-IFS=$as_save_IFS
-
-     ;;
-esac
-# We did not find ourselves, most probably we were run as `sh COMMAND'
-# in which case we are not to be found in the path.
-if test "x$as_myself" = x; then
-  as_myself=$0
-fi
-if test ! -f "$as_myself"; then
-  $as_echo "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
-  exit 1
-fi
-
-# Unset variables that we do not need and which cause bugs (e.g. in
-# pre-3.0 UWIN ksh).  But do not cause bugs in bash 2.01; the "|| exit 1"
-# suppresses any "Segmentation fault" message there.  '((' could
-# trigger a bug in pdksh 5.2.14.
-for as_var in BASH_ENV ENV MAIL MAILPATH
-do eval test x\${$as_var+set} = xset \
-  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
-done
-PS1='$ '
-PS2='> '
-PS4='+ '
-
-# NLS nuisances.
-LC_ALL=C
-export LC_ALL
-LANGUAGE=C
-export LANGUAGE
-
-# CDPATH.
-(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
-
-
-# as_fn_error STATUS ERROR [LINENO LOG_FD]
-# ----------------------------------------
-# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
-# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
-# script with STATUS, using 1 if that was 0.
-as_fn_error ()
-{
-  as_status=$1; test $as_status -eq 0 && as_status=1
-  if test "$4"; then
-    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-    $as_echo "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
-  fi
-  $as_echo "$as_me: error: $2" >&2
-  as_fn_exit $as_status
-} # as_fn_error
-
-
-# as_fn_set_status STATUS
-# -----------------------
-# Set $? to STATUS, without forking.
-as_fn_set_status ()
-{
-  return $1
-} # as_fn_set_status
-
-# as_fn_exit STATUS
-# -----------------
-# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
-as_fn_exit ()
-{
-  set +e
-  as_fn_set_status $1
-  exit $1
-} # as_fn_exit
-
-# as_fn_unset VAR
-# ---------------
-# Portably unset VAR.
-as_fn_unset ()
-{
-  { eval $1=; unset $1;}
-}
-as_unset=as_fn_unset
-# as_fn_append VAR VALUE
-# ----------------------
-# Append the text in VALUE to the end of the definition contained in VAR. Take
-# advantage of any shell optimizations that allow amortized linear growth over
-# repeated appends, instead of the typical quadratic growth present in naive
-# implementations.
-if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null; then :
-  eval 'as_fn_append ()
-  {
-    eval $1+=\$2
-  }'
-else
-  as_fn_append ()
-  {
-    eval $1=\$$1\$2
-  }
-fi # as_fn_append
-
-# as_fn_arith ARG...
-# ------------------
-# Perform arithmetic evaluation on the ARGs, and store the result in the
-# global $as_val. Take advantage of shells that can avoid forks. The arguments
-# must be portable across $(()) and expr.
-if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null; then :
-  eval 'as_fn_arith ()
-  {
-    as_val=$(( $* ))
-  }'
-else
-  as_fn_arith ()
-  {
-    as_val=`expr "$@" || test $? -eq 1`
-  }
-fi # as_fn_arith
-
-
-if expr a : '\(a\)' >/dev/null 2>&1 &&
-   test "X`expr 00001 : '.*\(...\)'`" = X001; then
-  as_expr=expr
-else
-  as_expr=false
-fi
-
-if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
-  as_basename=basename
-else
-  as_basename=false
-fi
-
-if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
-  as_dirname=dirname
-else
-  as_dirname=false
-fi
-
-as_me=`$as_basename -- "$0" ||
-$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
-	 X"$0" : 'X\(//\)$' \| \
-	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X/"$0" |
-    sed '/^.*\/\([^/][^/]*\)\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\/\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\/\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-
-# Avoid depending upon Character Ranges.
-as_cr_letters='abcdefghijklmnopqrstuvwxyz'
-as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
-as_cr_Letters=$as_cr_letters$as_cr_LETTERS
-as_cr_digits='0123456789'
-as_cr_alnum=$as_cr_Letters$as_cr_digits
-
-ECHO_C= ECHO_N= ECHO_T=
-case `echo -n x` in #(((((
--n*)
-  case `echo 'xy\c'` in
-  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
-  xy)  ECHO_C='\c';;
-  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
-       ECHO_T='	';;
-  esac;;
-*)
-  ECHO_N='-n';;
-esac
-
-rm -f conf$$ conf$$.exe conf$$.file
-if test -d conf$$.dir; then
-  rm -f conf$$.dir/conf$$.file
-else
-  rm -f conf$$.dir
-  mkdir conf$$.dir 2>/dev/null
-fi
-if (echo >conf$$.file) 2>/dev/null; then
-  if ln -s conf$$.file conf$$ 2>/dev/null; then
-    as_ln_s='ln -s'
-    # ... but there are two gotchas:
-    # 1) On MSYS, both `ln -s file dir' and `ln file dir' fail.
-    # 2) DJGPP < 2.04 has no symlinks; `ln -s' creates a wrapper executable.
-    # In both cases, we have to default to `cp -pR'.
-    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
-      as_ln_s='cp -pR'
-  elif ln conf$$.file conf$$ 2>/dev/null; then
-    as_ln_s=ln
-  else
-    as_ln_s='cp -pR'
-  fi
-else
-  as_ln_s='cp -pR'
-fi
-rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
-rmdir conf$$.dir 2>/dev/null
-
-
-# as_fn_mkdir_p
-# -------------
-# Create "$as_dir" as a directory, including parents if necessary.
-as_fn_mkdir_p ()
-{
-
-  case $as_dir in #(
-  -*) as_dir=./$as_dir;;
-  esac
-  test -d "$as_dir" || eval $as_mkdir_p || {
-    as_dirs=
-    while :; do
-      case $as_dir in #(
-      *\'*) as_qdir=`$as_echo "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
-      *) as_qdir=$as_dir;;
-      esac
-      as_dirs="'$as_qdir' $as_dirs"
-      as_dir=`$as_dirname -- "$as_dir" ||
-$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
-	 X"$as_dir" : 'X\(//\)[^/]' \| \
-	 X"$as_dir" : 'X\(//\)$' \| \
-	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X"$as_dir" |
-    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)[^/].*/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-      test -d "$as_dir" && break
-    done
-    test -z "$as_dirs" || eval "mkdir $as_dirs"
-  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
-
-
-} # as_fn_mkdir_p
-if mkdir -p . 2>/dev/null; then
-  as_mkdir_p='mkdir -p "$as_dir"'
-else
-  test -d ./-p && rmdir ./-p
-  as_mkdir_p=false
-fi
-
-
-# as_fn_executable_p FILE
-# -----------------------
-# Test if FILE is an executable regular file.
-as_fn_executable_p ()
-{
-  test -f "$1" && test -x "$1"
-} # as_fn_executable_p
-as_test_x='test -x'
-as_executable_p=as_fn_executable_p
-
-# Sed expression to map a string onto a valid CPP name.
-as_tr_cpp="eval sed 'y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g'"
-
-# Sed expression to map a string onto a valid variable name.
-as_tr_sh="eval sed 'y%*+%pp%;s%[^_$as_cr_alnum]%_%g'"
-
-
-exec 6>&1
-## ----------------------------------- ##
-## Main body of $CONFIG_STATUS script. ##
-## ----------------------------------- ##
-_ASEOF
-test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1
-
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-# Save the log message, to keep $0 and so on meaningful, and to
-# report actual input values of CONFIG_FILES etc. instead of their
-# values after options handling.
-ac_log="
-This file was extended by Haskell network package $as_me 3.1.2.9, which was
-generated by GNU Autoconf 2.69.  Invocation command line was
-
-  CONFIG_FILES    = $CONFIG_FILES
-  CONFIG_HEADERS  = $CONFIG_HEADERS
-  CONFIG_LINKS    = $CONFIG_LINKS
-  CONFIG_COMMANDS = $CONFIG_COMMANDS
-  $ $0 $@
-
-on `(hostname || uname -n) 2>/dev/null | sed 1q`
-"
-
-_ACEOF
-
-
-case $ac_config_headers in *"
-"*) set x $ac_config_headers; shift; ac_config_headers=$*;;
-esac
-
-
-cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-# Files that config.status was made for.
-config_headers="$ac_config_headers"
-
-_ACEOF
-
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-ac_cs_usage="\
-\`$as_me' instantiates files and other configuration actions
-from templates according to the current configuration.  Unless the files
-and actions are specified as TAGs, all are instantiated by default.
-
-Usage: $0 [OPTION]... [TAG]...
-
-  -h, --help       print this help, then exit
-  -V, --version    print version number and configuration settings, then exit
-      --config     print configuration, then exit
-  -q, --quiet, --silent
-                   do not print progress messages
-  -d, --debug      don't remove temporary files
-      --recheck    update $as_me by reconfiguring in the same conditions
-      --header=FILE[:TEMPLATE]
-                   instantiate the configuration header FILE
-
-Configuration headers:
-$config_headers
-
-Report bugs to <libraries@haskell.org>."
-
-_ACEOF
-cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
-ac_cs_version="\\
-Haskell network package config.status 3.1.2.9
-configured by $0, generated by GNU Autoconf 2.69,
-  with options \\"\$ac_cs_config\\"
-
-Copyright (C) 2012 Free Software Foundation, Inc.
-This config.status script is free software; the Free Software Foundation
-gives unlimited permission to copy, distribute and modify it."
-
-ac_pwd='$ac_pwd'
-srcdir='$srcdir'
-test -n "\$AWK" || AWK=awk
-_ACEOF
-
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-# The default lists apply if the user does not specify any file.
-ac_need_defaults=:
-while test $# != 0
-do
-  case $1 in
-  --*=?*)
-    ac_option=`expr "X$1" : 'X\([^=]*\)='`
-    ac_optarg=`expr "X$1" : 'X[^=]*=\(.*\)'`
-    ac_shift=:
-    ;;
-  --*=)
-    ac_option=`expr "X$1" : 'X\([^=]*\)='`
-    ac_optarg=
-    ac_shift=:
-    ;;
-  *)
-    ac_option=$1
-    ac_optarg=$2
-    ac_shift=shift
-    ;;
-  esac
-
-  case $ac_option in
-  # Handling of the options.
-  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
-    ac_cs_recheck=: ;;
-  --version | --versio | --versi | --vers | --ver | --ve | --v | -V )
-    $as_echo "$ac_cs_version"; exit ;;
-  --config | --confi | --conf | --con | --co | --c )
-    $as_echo "$ac_cs_config"; exit ;;
-  --debug | --debu | --deb | --de | --d | -d )
-    debug=: ;;
-  --header | --heade | --head | --hea )
-    $ac_shift
-    case $ac_optarg in
-    *\'*) ac_optarg=`$as_echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"` ;;
-    esac
-    as_fn_append CONFIG_HEADERS " '$ac_optarg'"
-    ac_need_defaults=false;;
-  --he | --h)
-    # Conflict between --help and --header
-    as_fn_error $? "ambiguous option: \`$1'
-Try \`$0 --help' for more information.";;
-  --help | --hel | -h )
-    $as_echo "$ac_cs_usage"; exit ;;
-  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
-  | -silent | --silent | --silen | --sile | --sil | --si | --s)
-    ac_cs_silent=: ;;
-
-  # This is an error.
-  -*) as_fn_error $? "unrecognized option: \`$1'
-Try \`$0 --help' for more information." ;;
-
-  *) as_fn_append ac_config_targets " $1"
-     ac_need_defaults=false ;;
-
-  esac
-  shift
-done
-
-ac_configure_extra_args=
-
-if $ac_cs_silent; then
-  exec 6>/dev/null
-  ac_configure_extra_args="$ac_configure_extra_args --silent"
-fi
-
-_ACEOF
-cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-if \$ac_cs_recheck; then
-  set X $SHELL '$0' $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
-  shift
-  \$as_echo "running CONFIG_SHELL=$SHELL \$*" >&6
-  CONFIG_SHELL='$SHELL'
-  export CONFIG_SHELL
-  exec "\$@"
-fi
-
-_ACEOF
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-exec 5>>config.log
-{
-  echo
-  sed 'h;s/./-/g;s/^.../## /;s/...$/ ##/;p;x;p;x' <<_ASBOX
-## Running $as_me. ##
-_ASBOX
-  $as_echo "$ac_log"
-} >&5
-
-_ACEOF
-cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-_ACEOF
-
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-
-# Handling of arguments.
-for ac_config_target in $ac_config_targets
-do
-  case $ac_config_target in
-    "include/HsNetworkConfig.h") CONFIG_HEADERS="$CONFIG_HEADERS include/HsNetworkConfig.h" ;;
-
-  *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
-  esac
-done
-
-
-# If the user did not use the arguments to specify the items to instantiate,
-# then the envvar interface is used.  Set only those that are not.
-# We use the long form for the default assignment because of an extremely
-# bizarre bug on SunOS 4.1.3.
-if $ac_need_defaults; then
-  test "${CONFIG_HEADERS+set}" = set || CONFIG_HEADERS=$config_headers
-fi
-
-# Have a temporary directory for convenience.  Make it in the build tree
-# simply because there is no reason against having it here, and in addition,
-# creating and moving files from /tmp can sometimes cause problems.
-# Hook for its removal unless debugging.
-# Note that there is a small window in which the directory will not be cleaned:
-# after its creation but before its name has been assigned to `$tmp'.
-$debug ||
-{
-  tmp= ac_tmp=
-  trap 'exit_status=$?
-  : "${ac_tmp:=$tmp}"
-  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
-' 0
-  trap 'as_fn_exit 1' 1 2 13 15
-}
-# Create a (secure) tmp directory for tmp files.
-
-{
-  tmp=`(umask 077 && mktemp -d "./confXXXXXX") 2>/dev/null` &&
-  test -d "$tmp"
-}  ||
-{
-  tmp=./conf$$-$RANDOM
-  (umask 077 && mkdir "$tmp")
-} || as_fn_error $? "cannot create a temporary directory in ." "$LINENO" 5
-ac_tmp=$tmp
-
-# Set up the scripts for CONFIG_HEADERS section.
-# No need to generate them if there are no CONFIG_HEADERS.
-# This happens for instance with `./config.status Makefile'.
-if test -n "$CONFIG_HEADERS"; then
-cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
-BEGIN {
-_ACEOF
-
-# Transform confdefs.h into an awk script `defines.awk', embedded as
-# here-document in config.status, that substitutes the proper values into
-# config.h.in to produce config.h.
-
-# Create a delimiter string that does not exist in confdefs.h, to ease
-# handling of long lines.
-ac_delim='%!_!# '
-for ac_last_try in false false :; do
-  ac_tt=`sed -n "/$ac_delim/p" confdefs.h`
-  if test -z "$ac_tt"; then
-    break
-  elif $ac_last_try; then
-    as_fn_error $? "could not make $CONFIG_HEADERS" "$LINENO" 5
-  else
-    ac_delim="$ac_delim!$ac_delim _$ac_delim!! "
-  fi
-done
-
-# For the awk script, D is an array of macro values keyed by name,
-# likewise P contains macro parameters if any.  Preserve backslash
-# newline sequences.
-
-ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
-sed -n '
-s/.\{148\}/&'"$ac_delim"'/g
-t rset
-:rset
-s/^[	 ]*#[	 ]*define[	 ][	 ]*/ /
-t def
-d
-:def
-s/\\$//
-t bsnl
-s/["\\]/\\&/g
-s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
-D["\1"]=" \3"/p
-s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2"/p
-d
-:bsnl
-s/["\\]/\\&/g
-s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
-D["\1"]=" \3\\\\\\n"\\/p
-t cont
-s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2\\\\\\n"\\/p
-t cont
-d
-:cont
-n
-s/.\{148\}/&'"$ac_delim"'/g
-t clear
-:clear
-s/\\$//
-t bsnlc
-s/["\\]/\\&/g; s/^/"/; s/$/"/p
-d
-:bsnlc
-s/["\\]/\\&/g; s/^/"/; s/$/\\\\\\n"\\/p
-b cont
-' <confdefs.h | sed '
-s/'"$ac_delim"'/"\\\
-"/g' >>$CONFIG_STATUS || ac_write_fail=1
-
-cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
-  for (key in D) D_is_set[key] = 1
-  FS = ""
-}
-/^[\t ]*#[\t ]*(define|undef)[\t ]+$ac_word_re([\t (]|\$)/ {
-  line = \$ 0
-  split(line, arg, " ")
-  if (arg[1] == "#") {
-    defundef = arg[2]
-    mac1 = arg[3]
-  } else {
-    defundef = substr(arg[1], 2)
-    mac1 = arg[2]
-  }
-  split(mac1, mac2, "(") #)
-  macro = mac2[1]
-  prefix = substr(line, 1, index(line, defundef) - 1)
-  if (D_is_set[macro]) {
-    # Preserve the white space surrounding the "#".
-    print prefix "define", macro P[macro] D[macro]
-    next
-  } else {
-    # Replace #undef with comments.  This is necessary, for example,
-    # in the case of _POSIX_SOURCE, which is predefined and required
-    # on some systems where configure will not decide to define it.
-    if (defundef == "undef") {
-      print "/*", prefix defundef, macro, "*/"
-      next
-    }
-  }
-}
-{ print }
-_ACAWK
-_ACEOF
-cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
-  as_fn_error $? "could not setup config headers machinery" "$LINENO" 5
-fi # test -n "$CONFIG_HEADERS"
-
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-eval set X "    :H $CONFIG_HEADERS    "
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-  case $ac_tag in
-  :[FHLC]) ac_mode=$ac_tag; continue;;
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-  case $ac_mode$ac_tag in
-  :[FHL]*:*);;
-  :L* | :C*:*) as_fn_error $? "invalid tag \`$ac_tag'" "$LINENO" 5;;
-  :[FH]-) ac_tag=-:-;;
-  :[FH]*) ac_tag=$ac_tag:$ac_tag.in;;
-  esac
-  ac_save_IFS=$IFS
-  IFS=:
-  set x $ac_tag
-  IFS=$ac_save_IFS
-  shift
-  ac_file=$1
-  shift
-
-  case $ac_mode in
-  :L) ac_source=$1;;
-  :[FH])
-    ac_file_inputs=
-    for ac_f
-    do
-      case $ac_f in
-      -) ac_f="$ac_tmp/stdin";;
-      *) # Look for the file first in the build tree, then in the source tree
-	 # (if the path is not absolute).  The absolute path cannot be DOS-style,
-	 # because $ac_f cannot contain `:'.
-	 test -f "$ac_f" ||
-	   case $ac_f in
-	   [\\/$]*) false;;
-	   *) test -f "$srcdir/$ac_f" && ac_f="$srcdir/$ac_f";;
-	   esac ||
-	   as_fn_error 1 "cannot find input file: \`$ac_f'" "$LINENO" 5;;
-      esac
-      case $ac_f in *\'*) ac_f=`$as_echo "$ac_f" | sed "s/'/'\\\\\\\\''/g"`;; esac
-      as_fn_append ac_file_inputs " '$ac_f'"
-    done
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-    # Let's still pretend it is `configure' which instantiates (i.e., don't
-    # use $as_me), people would be surprised to read:
-    #    /* config.h.  Generated by config.status.  */
-    configure_input='Generated from '`
-	  $as_echo "$*" | sed 's|^[^:]*/||;s|:[^:]*/|, |g'
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-    if test x"$ac_file" != x-; then
-      configure_input="$ac_file.  $configure_input"
-      { $as_echo "$as_me:${as_lineno-$LINENO}: creating $ac_file" >&5
-$as_echo "$as_me: creating $ac_file" >&6;}
-    fi
-    # Neutralize special characters interpreted by sed in replacement strings.
-    case $configure_input in #(
-    *\&* | *\|* | *\\* )
-       ac_sed_conf_input=`$as_echo "$configure_input" |
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-    *) ac_sed_conf_input=$configure_input;;
-    esac
-
-    case $ac_tag in
-    *:-:* | *:-) cat >"$ac_tmp/stdin" \
-      || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ;;
-    esac
-    ;;
-  esac
-
-  ac_dir=`$as_dirname -- "$ac_file" ||
-$as_expr X"$ac_file" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
-	 X"$ac_file" : 'X\(//\)[^/]' \| \
-	 X"$ac_file" : 'X\(//\)$' \| \
-	 X"$ac_file" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X"$ac_file" |
-    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)[^/].*/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-  as_dir="$ac_dir"; as_fn_mkdir_p
-  ac_builddir=.
-
-case "$ac_dir" in
-.) ac_dir_suffix= ac_top_builddir_sub=. ac_top_build_prefix= ;;
-*)
-  ac_dir_suffix=/`$as_echo "$ac_dir" | sed 's|^\.[\\/]||'`
-  # A ".." for each directory in $ac_dir_suffix.
-  ac_top_builddir_sub=`$as_echo "$ac_dir_suffix" | sed 's|/[^\\/]*|/..|g;s|/||'`
-  case $ac_top_builddir_sub in
-  "") ac_top_builddir_sub=. ac_top_build_prefix= ;;
-  *)  ac_top_build_prefix=$ac_top_builddir_sub/ ;;
-  esac ;;
-esac
-ac_abs_top_builddir=$ac_pwd
-ac_abs_builddir=$ac_pwd$ac_dir_suffix
-# for backward compatibility:
-ac_top_builddir=$ac_top_build_prefix
-
-case $srcdir in
-  .)  # We are building in place.
-    ac_srcdir=.
-    ac_top_srcdir=$ac_top_builddir_sub
-    ac_abs_top_srcdir=$ac_pwd ;;
-  [\\/]* | ?:[\\/]* )  # Absolute name.
-    ac_srcdir=$srcdir$ac_dir_suffix;
-    ac_top_srcdir=$srcdir
-    ac_abs_top_srcdir=$srcdir ;;
-  *) # Relative name.
-    ac_srcdir=$ac_top_build_prefix$srcdir$ac_dir_suffix
-    ac_top_srcdir=$ac_top_build_prefix$srcdir
-    ac_abs_top_srcdir=$ac_pwd/$srcdir ;;
-esac
-ac_abs_srcdir=$ac_abs_top_srcdir$ac_dir_suffix
-
-
-  case $ac_mode in
-
-  :H)
-  #
-  # CONFIG_HEADER
-  #
-  if test x"$ac_file" != x-; then
-    {
-      $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
-    } >"$ac_tmp/config.h" \
-      || as_fn_error $? "could not create $ac_file" "$LINENO" 5
-    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
-      { $as_echo "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
-$as_echo "$as_me: $ac_file is unchanged" >&6;}
-    else
-      rm -f "$ac_file"
-      mv "$ac_tmp/config.h" "$ac_file" \
-	|| as_fn_error $? "could not create $ac_file" "$LINENO" 5
-    fi
-  else
-    $as_echo "/* $configure_input  */" \
-      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
-      || as_fn_error $? "could not create -" "$LINENO" 5
-  fi
- ;;
-
-
-  esac
-
-done # for ac_tag
-
-
-as_fn_exit 0
-_ACEOF
-ac_clean_files=$ac_clean_files_save
-
-test $ac_write_fail = 0 ||
-  as_fn_error $? "write failure creating $CONFIG_STATUS" "$LINENO" 5
-
-
-# configure is writing to config.log, and then calls config.status.
-# config.status does its own redirection, appending to config.log.
-# Unfortunately, on DOS this fails, as config.log is still kept open
-# by configure, so config.status won't be able to write to it; its
-# output is simply discarded.  So we exec the FD to /dev/null,
-# effectively closing config.log, so it can be properly (re)opened and
-# appended to by config.status.  When coming back to configure, we
-# need to make the FD available again.
-if test "$no_create" != yes; then
-  ac_cs_success=:
-  ac_config_status_args=
-  test "$silent" = yes &&
-    ac_config_status_args="$ac_config_status_args --quiet"
-  exec 5>/dev/null
-  $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false
-  exec 5>>config.log
-  # Use ||, not &&, to avoid exiting from the if with $? = 1, which
-  # would make configure fail if this is the last instruction.
-  $ac_cs_success || as_fn_exit 1
-fi
-if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
-$as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
-fi
+# Generated by GNU Autoconf 2.72 for Haskell network package 3.2.7.0.
+#
+# Report bugs to <libraries@haskell.org>.
+#
+#
+# Copyright (C) 1992-1996, 1998-2017, 2020-2023 Free Software Foundation,
+# Inc.
+#
+#
+# This configure script is free software; the Free Software Foundation
+# gives unlimited permission to copy, distribute and modify it.
+## -------------------- ##
+## M4sh Initialization. ##
+## -------------------- ##
+
+# Be more Bourne compatible
+DUALCASE=1; export DUALCASE # for MKS sh
+if test ${ZSH_VERSION+y} && (emulate sh) >/dev/null 2>&1
+then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else case e in #(
+  e) case `(set -o) 2>/dev/null` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac ;;
+esac
+fi
+
+
+
+# Reset variables that may have inherited troublesome values from
+# the environment.
+
+# IFS needs to be set, to space, tab, and newline, in precisely that order.
+# (If _AS_PATH_WALK were called with IFS unset, it would have the
+# side effect of setting IFS to empty, thus disabling word splitting.)
+# Quoting is to prevent editors from complaining about space-tab.
+as_nl='
+'
+export as_nl
+IFS=" ""	$as_nl"
+
+PS1='$ '
+PS2='> '
+PS4='+ '
+
+# Ensure predictable behavior from utilities with locale-dependent output.
+LC_ALL=C
+export LC_ALL
+LANGUAGE=C
+export LANGUAGE
+
+# We cannot yet rely on "unset" to work, but we need these variables
+# to be unset--not just set to an empty or harmless value--now, to
+# avoid bugs in old shells (e.g. pre-3.0 UWIN ksh).  This construct
+# also avoids known problems related to "unset" and subshell syntax
+# in other old shells (e.g. bash 2.01 and pdksh 5.2.14).
+for as_var in BASH_ENV ENV MAIL MAILPATH CDPATH
+do eval test \${$as_var+y} \
+  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
+done
+
+# Ensure that fds 0, 1, and 2 are open.
+if (exec 3>&0) 2>/dev/null; then :; else exec 0</dev/null; fi
+if (exec 3>&1) 2>/dev/null; then :; else exec 1>/dev/null; fi
+if (exec 3>&2)            ; then :; else exec 2>/dev/null; fi
+
+# The user is always right.
+if ${PATH_SEPARATOR+false} :; then
+  PATH_SEPARATOR=:
+  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
+    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
+      PATH_SEPARATOR=';'
+  }
+fi
+
+
+# Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
+case $0 in #((
+  *[\\/]* ) as_myself=$0 ;;
+  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    test -r "$as_dir$0" && as_myself=$as_dir$0 && break
+  done
+IFS=$as_save_IFS
+
+     ;;
+esac
+# We did not find ourselves, most probably we were run as 'sh COMMAND'
+# in which case we are not to be found in the path.
+if test "x$as_myself" = x; then
+  as_myself=$0
+fi
+if test ! -f "$as_myself"; then
+  printf "%s\n" "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
+  exit 1
+fi
+
+
+# Use a proper internal environment variable to ensure we don't fall
+  # into an infinite loop, continuously re-executing ourselves.
+  if test x"${_as_can_reexec}" != xno && test "x$CONFIG_SHELL" != x; then
+    _as_can_reexec=no; export _as_can_reexec;
+    # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed 'exec'.
+printf "%s\n" "$0: could not re-execute with $CONFIG_SHELL" >&2
+exit 255
+  fi
+  # We don't want this to propagate to other subprocesses.
+          { _as_can_reexec=; unset _as_can_reexec;}
+if test "x$CONFIG_SHELL" = x; then
+  as_bourne_compatible="if test \${ZSH_VERSION+y} && (emulate sh) >/dev/null 2>&1
+then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on \${1+\"\$@\"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '\${1+\"\$@\"}'='\"\$@\"'
+  setopt NO_GLOB_SUBST
+else case e in #(
+  e) case \`(set -o) 2>/dev/null\` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac ;;
+esac
+fi
+"
+  as_required="as_fn_return () { (exit \$1); }
+as_fn_success () { as_fn_return 0; }
+as_fn_failure () { as_fn_return 1; }
+as_fn_ret_success () { return 0; }
+as_fn_ret_failure () { return 1; }
+
+exitcode=0
+as_fn_success || { exitcode=1; echo as_fn_success failed.; }
+as_fn_failure && { exitcode=1; echo as_fn_failure succeeded.; }
+as_fn_ret_success || { exitcode=1; echo as_fn_ret_success failed.; }
+as_fn_ret_failure && { exitcode=1; echo as_fn_ret_failure succeeded.; }
+if ( set x; as_fn_ret_success y && test x = \"\$1\" )
+then :
+
+else case e in #(
+  e) exitcode=1; echo positional parameters were not saved. ;;
+esac
+fi
+test x\$exitcode = x0 || exit 1
+blah=\$(echo \$(echo blah))
+test x\"\$blah\" = xblah || exit 1
+test -x / || exit 1"
+  as_suggested="  as_lineno_1=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_1a=\$LINENO
+  as_lineno_2=";as_suggested=$as_suggested$LINENO;as_suggested=$as_suggested" as_lineno_2a=\$LINENO
+  eval 'test \"x\$as_lineno_1'\$as_run'\" != \"x\$as_lineno_2'\$as_run'\" &&
+  test \"x\`expr \$as_lineno_1'\$as_run' + 1\`\" = \"x\$as_lineno_2'\$as_run'\"' || exit 1"
+  if (eval "$as_required") 2>/dev/null
+then :
+  as_have_required=yes
+else case e in #(
+  e) as_have_required=no ;;
+esac
+fi
+  if test x$as_have_required = xyes && (eval "$as_suggested") 2>/dev/null
+then :
+
+else case e in #(
+  e) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+as_found=false
+for as_dir in /bin$PATH_SEPARATOR/usr/bin$PATH_SEPARATOR$PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+  as_found=:
+  case $as_dir in #(
+	 /*)
+	   for as_base in sh bash ksh sh5; do
+	     # Try only shells that exist, to save several forks.
+	     as_shell=$as_dir$as_base
+	     if { test -f "$as_shell" || test -f "$as_shell.exe"; } &&
+		    as_run=a "$as_shell" -c "$as_bourne_compatible""$as_required" 2>/dev/null
+then :
+  CONFIG_SHELL=$as_shell as_have_required=yes
+		   if as_run=a "$as_shell" -c "$as_bourne_compatible""$as_suggested" 2>/dev/null
+then :
+  break 2
+fi
+fi
+	   done;;
+       esac
+  as_found=false
+done
+IFS=$as_save_IFS
+if $as_found
+then :
+
+else case e in #(
+  e) if { test -f "$SHELL" || test -f "$SHELL.exe"; } &&
+	      as_run=a "$SHELL" -c "$as_bourne_compatible""$as_required" 2>/dev/null
+then :
+  CONFIG_SHELL=$SHELL as_have_required=yes
+fi ;;
+esac
+fi
+
+
+      if test "x$CONFIG_SHELL" != x
+then :
+  export CONFIG_SHELL
+             # We cannot yet assume a decent shell, so we have to provide a
+# neutralization value for shells without unset; and this also
+# works around shells that cannot unset nonexistent variables.
+# Preserve -v and -x to the replacement shell.
+BASH_ENV=/dev/null
+ENV=/dev/null
+(unset BASH_ENV) >/dev/null 2>&1 && unset BASH_ENV ENV
+case $- in # ((((
+  *v*x* | *x*v* ) as_opts=-vx ;;
+  *v* ) as_opts=-v ;;
+  *x* ) as_opts=-x ;;
+  * ) as_opts= ;;
+esac
+exec $CONFIG_SHELL $as_opts "$as_myself" ${1+"$@"}
+# Admittedly, this is quite paranoid, since all the known shells bail
+# out after a failed 'exec'.
+printf "%s\n" "$0: could not re-execute with $CONFIG_SHELL" >&2
+exit 255
+fi
+
+    if test x$as_have_required = xno
+then :
+  printf "%s\n" "$0: This script requires a shell more modern than all"
+  printf "%s\n" "$0: the shells that I found on your system."
+  if test ${ZSH_VERSION+y} ; then
+    printf "%s\n" "$0: In particular, zsh $ZSH_VERSION has bugs and should"
+    printf "%s\n" "$0: be upgraded to zsh 4.3.4 or later."
+  else
+    printf "%s\n" "$0: Please tell bug-autoconf@gnu.org and
+$0: libraries@haskell.org about your system, including any
+$0: error possibly output before this message. Then install
+$0: a modern shell, or manually run the script under such a
+$0: shell if you do have one."
+  fi
+  exit 1
+fi ;;
+esac
+fi
+fi
+SHELL=${CONFIG_SHELL-/bin/sh}
+export SHELL
+# Unset more variables known to interfere with behavior of common tools.
+CLICOLOR_FORCE= GREP_OPTIONS=
+unset CLICOLOR_FORCE GREP_OPTIONS
+
+## --------------------- ##
+## M4sh Shell Functions. ##
+## --------------------- ##
+# as_fn_unset VAR
+# ---------------
+# Portably unset VAR.
+as_fn_unset ()
+{
+  { eval $1=; unset $1;}
+}
+as_unset=as_fn_unset
+
+
+# as_fn_set_status STATUS
+# -----------------------
+# Set $? to STATUS, without forking.
+as_fn_set_status ()
+{
+  return $1
+} # as_fn_set_status
+
+# as_fn_exit STATUS
+# -----------------
+# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
+as_fn_exit ()
+{
+  set +e
+  as_fn_set_status $1
+  exit $1
+} # as_fn_exit
+
+# as_fn_mkdir_p
+# -------------
+# Create "$as_dir" as a directory, including parents if necessary.
+as_fn_mkdir_p ()
+{
+
+  case $as_dir in #(
+  -*) as_dir=./$as_dir;;
+  esac
+  test -d "$as_dir" || eval $as_mkdir_p || {
+    as_dirs=
+    while :; do
+      case $as_dir in #(
+      *\'*) as_qdir=`printf "%s\n" "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
+      *) as_qdir=$as_dir;;
+      esac
+      as_dirs="'$as_qdir' $as_dirs"
+      as_dir=`$as_dirname -- "$as_dir" ||
+$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_dir" : 'X\(//\)[^/]' \| \
+	 X"$as_dir" : 'X\(//\)$' \| \
+	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X"$as_dir" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+      test -d "$as_dir" && break
+    done
+    test -z "$as_dirs" || eval "mkdir $as_dirs"
+  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
+
+
+} # as_fn_mkdir_p
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
+# as_fn_append VAR VALUE
+# ----------------------
+# Append the text in VALUE to the end of the definition contained in VAR. Take
+# advantage of any shell optimizations that allow amortized linear growth over
+# repeated appends, instead of the typical quadratic growth present in naive
+# implementations.
+if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null
+then :
+  eval 'as_fn_append ()
+  {
+    eval $1+=\$2
+  }'
+else case e in #(
+  e) as_fn_append ()
+  {
+    eval $1=\$$1\$2
+  } ;;
+esac
+fi # as_fn_append
+
+# as_fn_arith ARG...
+# ------------------
+# Perform arithmetic evaluation on the ARGs, and store the result in the
+# global $as_val. Take advantage of shells that can avoid forks. The arguments
+# must be portable across $(()) and expr.
+if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null
+then :
+  eval 'as_fn_arith ()
+  {
+    as_val=$(( $* ))
+  }'
+else case e in #(
+  e) as_fn_arith ()
+  {
+    as_val=`expr "$@" || test $? -eq 1`
+  } ;;
+esac
+fi # as_fn_arith
+
+
+# as_fn_error STATUS ERROR [LINENO LOG_FD]
+# ----------------------------------------
+# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
+# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
+# script with STATUS, using 1 if that was 0.
+as_fn_error ()
+{
+  as_status=$1; test $as_status -eq 0 && as_status=1
+  if test "$4"; then
+    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
+  fi
+  printf "%s\n" "$as_me: error: $2" >&2
+  as_fn_exit $as_status
+} # as_fn_error
+
+if expr a : '\(a\)' >/dev/null 2>&1 &&
+   test "X`expr 00001 : '.*\(...\)'`" = X001; then
+  as_expr=expr
+else
+  as_expr=false
+fi
+
+if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
+  as_basename=basename
+else
+  as_basename=false
+fi
+
+if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
+  as_dirname=dirname
+else
+  as_dirname=false
+fi
+
+as_me=`$as_basename -- "$0" ||
+$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
+	 X"$0" : 'X\(//\)$' \| \
+	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X/"$0" |
+    sed '/^.*\/\([^/][^/]*\)\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+
+# Avoid depending upon Character Ranges.
+as_cr_letters='abcdefghijklmnopqrstuvwxyz'
+as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+as_cr_Letters=$as_cr_letters$as_cr_LETTERS
+as_cr_digits='0123456789'
+as_cr_alnum=$as_cr_Letters$as_cr_digits
+
+
+  as_lineno_1=$LINENO as_lineno_1a=$LINENO
+  as_lineno_2=$LINENO as_lineno_2a=$LINENO
+  eval 'test "x$as_lineno_1'$as_run'" != "x$as_lineno_2'$as_run'" &&
+  test "x`expr $as_lineno_1'$as_run' + 1`" = "x$as_lineno_2'$as_run'"' || {
+  # Blame Lee E. McMahon (1931-1989) for sed's syntax.  :-)
+  sed -n '
+    p
+    /[$]LINENO/=
+  ' <$as_myself |
+    sed '
+      t clear
+      :clear
+      s/[$]LINENO.*/&-/
+      t lineno
+      b
+      :lineno
+      N
+      :loop
+      s/[$]LINENO\([^'$as_cr_alnum'_].*\n\)\(.*\)/\2\1\2/
+      t loop
+      s/-\n.*//
+    ' >$as_me.lineno &&
+  chmod +x "$as_me.lineno" ||
+    { printf "%s\n" "$as_me: error: cannot create $as_me.lineno; rerun with a POSIX shell" >&2; as_fn_exit 1; }
+
+  # If we had to re-execute with $CONFIG_SHELL, we're ensured to have
+  # already done that, so ensure we don't try to do so again and fall
+  # in an infinite loop.  This has already happened in practice.
+  _as_can_reexec=no; export _as_can_reexec
+  # Don't try to exec as it changes $[0], causing all sort of problems
+  # (the dirname of $[0] is not the place where we might find the
+  # original and so on.  Autoconf is especially sensitive to this).
+  . "./$as_me.lineno"
+  # Exit status is that of the last command.
+  exit
+}
+
+
+# Determine whether it's possible to make 'echo' print without a newline.
+# These variables are no longer used directly by Autoconf, but are AC_SUBSTed
+# for compatibility with existing Makefiles.
+ECHO_C= ECHO_N= ECHO_T=
+case `echo -n x` in #(((((
+-n*)
+  case `echo 'xy\c'` in
+  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
+  xy)  ECHO_C='\c';;
+  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
+       ECHO_T='	';;
+  esac;;
+*)
+  ECHO_N='-n';;
+esac
+
+# For backward compatibility with old third-party macros, we provide
+# the shell variables $as_echo and $as_echo_n.  New code should use
+# AS_ECHO(["message"]) and AS_ECHO_N(["message"]), respectively.
+as_echo='printf %s\n'
+as_echo_n='printf %s'
+
+rm -f conf$$ conf$$.exe conf$$.file
+if test -d conf$$.dir; then
+  rm -f conf$$.dir/conf$$.file
+else
+  rm -f conf$$.dir
+  mkdir conf$$.dir 2>/dev/null
+fi
+if (echo >conf$$.file) 2>/dev/null; then
+  if ln -s conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s='ln -s'
+    # ... but there are two gotchas:
+    # 1) On MSYS, both 'ln -s file dir' and 'ln file dir' fail.
+    # 2) DJGPP < 2.04 has no symlinks; 'ln -s' creates a wrapper executable.
+    # In both cases, we have to default to 'cp -pR'.
+    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
+      as_ln_s='cp -pR'
+  elif ln conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s=ln
+  else
+    as_ln_s='cp -pR'
+  fi
+else
+  as_ln_s='cp -pR'
+fi
+rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
+rmdir conf$$.dir 2>/dev/null
+
+if mkdir -p . 2>/dev/null; then
+  as_mkdir_p='mkdir -p "$as_dir"'
+else
+  test -d ./-p && rmdir ./-p
+  as_mkdir_p=false
+fi
+
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
+
+# Sed expression to map a string onto a valid CPP name.
+as_sed_cpp="y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g"
+as_tr_cpp="eval sed '$as_sed_cpp'" # deprecated
+
+# Sed expression to map a string onto a valid variable name.
+as_sed_sh="y%*+%pp%;s%[^_$as_cr_alnum]%_%g"
+as_tr_sh="eval sed '$as_sed_sh'" # deprecated
+
+
+test -n "$DJDIR" || exec 7<&0 </dev/null
+exec 6>&1
+
+# Name of the host.
+# hostname on some systems (SVR3.2, old GNU/Linux) returns a bogus exit status,
+# so uname gets run too.
+ac_hostname=`(hostname || uname -n) 2>/dev/null | sed 1q`
+
+#
+# Initializations.
+#
+ac_default_prefix=/usr/local
+ac_clean_files=
+ac_config_libobj_dir=.
+LIBOBJS=
+cross_compiling=no
+subdirs=
+MFLAGS=
+MAKEFLAGS=
+
+# Identity of this package.
+PACKAGE_NAME='Haskell network package'
+PACKAGE_TARNAME='network'
+PACKAGE_VERSION='3.2.7.0'
+PACKAGE_STRING='Haskell network package 3.2.7.0'
+PACKAGE_BUGREPORT='libraries@haskell.org'
+PACKAGE_URL=''
+
+ac_unique_file="include/HsNet.h"
+# Factoring default headers for most tests.
+ac_includes_default="\
+#include <stddef.h>
+#ifdef HAVE_STDIO_H
+# include <stdio.h>
+#endif
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#ifdef HAVE_INTTYPES_H
+# include <inttypes.h>
+#endif
+#ifdef HAVE_STDINT_H
+# include <stdint.h>
+#endif
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif"
+
+ac_header_c_list=
+ac_subst_vars='LTLIBOBJS
+LIBOBJS
+OBJEXT
+EXEEXT
+ac_ct_CC
+CPPFLAGS
+LDFLAGS
+CFLAGS
+CC
+host_os
+host_vendor
+host_cpu
+host
+build_os
+build_vendor
+build_cpu
+build
+target_alias
+host_alias
+build_alias
+LIBS
+ECHO_T
+ECHO_N
+ECHO_C
+DEFS
+mandir
+localedir
+libdir
+psdir
+pdfdir
+dvidir
+htmldir
+infodir
+docdir
+oldincludedir
+includedir
+runstatedir
+localstatedir
+sharedstatedir
+sysconfdir
+datadir
+datarootdir
+libexecdir
+sbindir
+bindir
+program_transform_name
+prefix
+exec_prefix
+PACKAGE_URL
+PACKAGE_BUGREPORT
+PACKAGE_STRING
+PACKAGE_VERSION
+PACKAGE_TARNAME
+PACKAGE_NAME
+PATH_SEPARATOR
+SHELL'
+ac_subst_files=''
+ac_user_opts='
+enable_option_checking
+with_cc
+'
+      ac_precious_vars='build_alias
+host_alias
+target_alias
+CC
+CFLAGS
+LDFLAGS
+LIBS
+CPPFLAGS'
+
+
+# Initialize some variables set by options.
+ac_init_help=
+ac_init_version=false
+ac_unrecognized_opts=
+ac_unrecognized_sep=
+# The variables have the same names as the options, with
+# dashes changed to underlines.
+cache_file=/dev/null
+exec_prefix=NONE
+no_create=
+no_recursion=
+prefix=NONE
+program_prefix=NONE
+program_suffix=NONE
+program_transform_name=s,x,x,
+silent=
+site=
+srcdir=
+verbose=
+x_includes=NONE
+x_libraries=NONE
+
+# Installation directory options.
+# These are left unexpanded so users can "make install exec_prefix=/foo"
+# and all the variables that are supposed to be based on exec_prefix
+# by default will actually change.
+# Use braces instead of parens because sh, perl, etc. also accept them.
+# (The list follows the same order as the GNU Coding Standards.)
+bindir='${exec_prefix}/bin'
+sbindir='${exec_prefix}/sbin'
+libexecdir='${exec_prefix}/libexec'
+datarootdir='${prefix}/share'
+datadir='${datarootdir}'
+sysconfdir='${prefix}/etc'
+sharedstatedir='${prefix}/com'
+localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
+includedir='${prefix}/include'
+oldincludedir='/usr/include'
+docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
+infodir='${datarootdir}/info'
+htmldir='${docdir}'
+dvidir='${docdir}'
+pdfdir='${docdir}'
+psdir='${docdir}'
+libdir='${exec_prefix}/lib'
+localedir='${datarootdir}/locale'
+mandir='${datarootdir}/man'
+
+ac_prev=
+ac_dashdash=
+for ac_option
+do
+  # If the previous option needs an argument, assign it.
+  if test -n "$ac_prev"; then
+    eval $ac_prev=\$ac_option
+    ac_prev=
+    continue
+  fi
+
+  case $ac_option in
+  *=?*) ac_optarg=`expr "X$ac_option" : '[^=]*=\(.*\)'` ;;
+  *=)   ac_optarg= ;;
+  *)    ac_optarg=yes ;;
+  esac
+
+  case $ac_dashdash$ac_option in
+  --)
+    ac_dashdash=yes ;;
+
+  -bindir | --bindir | --bindi | --bind | --bin | --bi)
+    ac_prev=bindir ;;
+  -bindir=* | --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*)
+    bindir=$ac_optarg ;;
+
+  -build | --build | --buil | --bui | --bu)
+    ac_prev=build_alias ;;
+  -build=* | --build=* | --buil=* | --bui=* | --bu=*)
+    build_alias=$ac_optarg ;;
+
+  -cache-file | --cache-file | --cache-fil | --cache-fi \
+  | --cache-f | --cache- | --cache | --cach | --cac | --ca | --c)
+    ac_prev=cache_file ;;
+  -cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \
+  | --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* | --c=*)
+    cache_file=$ac_optarg ;;
+
+  --config-cache | -C)
+    cache_file=config.cache ;;
+
+  -datadir | --datadir | --datadi | --datad)
+    ac_prev=datadir ;;
+  -datadir=* | --datadir=* | --datadi=* | --datad=*)
+    datadir=$ac_optarg ;;
+
+  -datarootdir | --datarootdir | --datarootdi | --datarootd | --dataroot \
+  | --dataroo | --dataro | --datar)
+    ac_prev=datarootdir ;;
+  -datarootdir=* | --datarootdir=* | --datarootdi=* | --datarootd=* \
+  | --dataroot=* | --dataroo=* | --dataro=* | --datar=*)
+    datarootdir=$ac_optarg ;;
+
+  -disable-* | --disable-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*disable-\(.*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid feature name: '$ac_useropt'"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`printf "%s\n" "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"enable_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--disable-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval enable_$ac_useropt=no ;;
+
+  -docdir | --docdir | --docdi | --doc | --do)
+    ac_prev=docdir ;;
+  -docdir=* | --docdir=* | --docdi=* | --doc=* | --do=*)
+    docdir=$ac_optarg ;;
+
+  -dvidir | --dvidir | --dvidi | --dvid | --dvi | --dv)
+    ac_prev=dvidir ;;
+  -dvidir=* | --dvidir=* | --dvidi=* | --dvid=* | --dvi=* | --dv=*)
+    dvidir=$ac_optarg ;;
+
+  -enable-* | --enable-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*enable-\([^=]*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid feature name: '$ac_useropt'"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`printf "%s\n" "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"enable_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--enable-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval enable_$ac_useropt=\$ac_optarg ;;
+
+  -exec-prefix | --exec_prefix | --exec-prefix | --exec-prefi \
+  | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- \
+  | --exec | --exe | --ex)
+    ac_prev=exec_prefix ;;
+  -exec-prefix=* | --exec_prefix=* | --exec-prefix=* | --exec-prefi=* \
+  | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* \
+  | --exec=* | --exe=* | --ex=*)
+    exec_prefix=$ac_optarg ;;
+
+  -gas | --gas | --ga | --g)
+    # Obsolete; use --with-gas.
+    with_gas=yes ;;
+
+  -help | --help | --hel | --he | -h)
+    ac_init_help=long ;;
+  -help=r* | --help=r* | --hel=r* | --he=r* | -hr*)
+    ac_init_help=recursive ;;
+  -help=s* | --help=s* | --hel=s* | --he=s* | -hs*)
+    ac_init_help=short ;;
+
+  -host | --host | --hos | --ho)
+    ac_prev=host_alias ;;
+  -host=* | --host=* | --hos=* | --ho=*)
+    host_alias=$ac_optarg ;;
+
+  -htmldir | --htmldir | --htmldi | --htmld | --html | --htm | --ht)
+    ac_prev=htmldir ;;
+  -htmldir=* | --htmldir=* | --htmldi=* | --htmld=* | --html=* | --htm=* \
+  | --ht=*)
+    htmldir=$ac_optarg ;;
+
+  -includedir | --includedir | --includedi | --included | --include \
+  | --includ | --inclu | --incl | --inc)
+    ac_prev=includedir ;;
+  -includedir=* | --includedir=* | --includedi=* | --included=* | --include=* \
+  | --includ=* | --inclu=* | --incl=* | --inc=*)
+    includedir=$ac_optarg ;;
+
+  -infodir | --infodir | --infodi | --infod | --info | --inf)
+    ac_prev=infodir ;;
+  -infodir=* | --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*)
+    infodir=$ac_optarg ;;
+
+  -libdir | --libdir | --libdi | --libd)
+    ac_prev=libdir ;;
+  -libdir=* | --libdir=* | --libdi=* | --libd=*)
+    libdir=$ac_optarg ;;
+
+  -libexecdir | --libexecdir | --libexecdi | --libexecd | --libexec \
+  | --libexe | --libex | --libe)
+    ac_prev=libexecdir ;;
+  -libexecdir=* | --libexecdir=* | --libexecdi=* | --libexecd=* | --libexec=* \
+  | --libexe=* | --libex=* | --libe=*)
+    libexecdir=$ac_optarg ;;
+
+  -localedir | --localedir | --localedi | --localed | --locale)
+    ac_prev=localedir ;;
+  -localedir=* | --localedir=* | --localedi=* | --localed=* | --locale=*)
+    localedir=$ac_optarg ;;
+
+  -localstatedir | --localstatedir | --localstatedi | --localstated \
+  | --localstate | --localstat | --localsta | --localst | --locals)
+    ac_prev=localstatedir ;;
+  -localstatedir=* | --localstatedir=* | --localstatedi=* | --localstated=* \
+  | --localstate=* | --localstat=* | --localsta=* | --localst=* | --locals=*)
+    localstatedir=$ac_optarg ;;
+
+  -mandir | --mandir | --mandi | --mand | --man | --ma | --m)
+    ac_prev=mandir ;;
+  -mandir=* | --mandir=* | --mandi=* | --mand=* | --man=* | --ma=* | --m=*)
+    mandir=$ac_optarg ;;
+
+  -nfp | --nfp | --nf)
+    # Obsolete; use --without-fp.
+    with_fp=no ;;
+
+  -no-create | --no-create | --no-creat | --no-crea | --no-cre \
+  | --no-cr | --no-c | -n)
+    no_create=yes ;;
+
+  -no-recursion | --no-recursion | --no-recursio | --no-recursi \
+  | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r)
+    no_recursion=yes ;;
+
+  -oldincludedir | --oldincludedir | --oldincludedi | --oldincluded \
+  | --oldinclude | --oldinclud | --oldinclu | --oldincl | --oldinc \
+  | --oldin | --oldi | --old | --ol | --o)
+    ac_prev=oldincludedir ;;
+  -oldincludedir=* | --oldincludedir=* | --oldincludedi=* | --oldincluded=* \
+  | --oldinclude=* | --oldinclud=* | --oldinclu=* | --oldincl=* | --oldinc=* \
+  | --oldin=* | --oldi=* | --old=* | --ol=* | --o=*)
+    oldincludedir=$ac_optarg ;;
+
+  -prefix | --prefix | --prefi | --pref | --pre | --pr | --p)
+    ac_prev=prefix ;;
+  -prefix=* | --prefix=* | --prefi=* | --pref=* | --pre=* | --pr=* | --p=*)
+    prefix=$ac_optarg ;;
+
+  -program-prefix | --program-prefix | --program-prefi | --program-pref \
+  | --program-pre | --program-pr | --program-p)
+    ac_prev=program_prefix ;;
+  -program-prefix=* | --program-prefix=* | --program-prefi=* \
+  | --program-pref=* | --program-pre=* | --program-pr=* | --program-p=*)
+    program_prefix=$ac_optarg ;;
+
+  -program-suffix | --program-suffix | --program-suffi | --program-suff \
+  | --program-suf | --program-su | --program-s)
+    ac_prev=program_suffix ;;
+  -program-suffix=* | --program-suffix=* | --program-suffi=* \
+  | --program-suff=* | --program-suf=* | --program-su=* | --program-s=*)
+    program_suffix=$ac_optarg ;;
+
+  -program-transform-name | --program-transform-name \
+  | --program-transform-nam | --program-transform-na \
+  | --program-transform-n | --program-transform- \
+  | --program-transform | --program-transfor \
+  | --program-transfo | --program-transf \
+  | --program-trans | --program-tran \
+  | --progr-tra | --program-tr | --program-t)
+    ac_prev=program_transform_name ;;
+  -program-transform-name=* | --program-transform-name=* \
+  | --program-transform-nam=* | --program-transform-na=* \
+  | --program-transform-n=* | --program-transform-=* \
+  | --program-transform=* | --program-transfor=* \
+  | --program-transfo=* | --program-transf=* \
+  | --program-trans=* | --program-tran=* \
+  | --progr-tra=* | --program-tr=* | --program-t=*)
+    program_transform_name=$ac_optarg ;;
+
+  -pdfdir | --pdfdir | --pdfdi | --pdfd | --pdf | --pd)
+    ac_prev=pdfdir ;;
+  -pdfdir=* | --pdfdir=* | --pdfdi=* | --pdfd=* | --pdf=* | --pd=*)
+    pdfdir=$ac_optarg ;;
+
+  -psdir | --psdir | --psdi | --psd | --ps)
+    ac_prev=psdir ;;
+  -psdir=* | --psdir=* | --psdi=* | --psd=* | --ps=*)
+    psdir=$ac_optarg ;;
+
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil)
+    silent=yes ;;
+
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
+  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
+    ac_prev=sbindir ;;
+  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
+  | --sbi=* | --sb=*)
+    sbindir=$ac_optarg ;;
+
+  -sharedstatedir | --sharedstatedir | --sharedstatedi \
+  | --sharedstated | --sharedstate | --sharedstat | --sharedsta \
+  | --sharedst | --shareds | --shared | --share | --shar \
+  | --sha | --sh)
+    ac_prev=sharedstatedir ;;
+  -sharedstatedir=* | --sharedstatedir=* | --sharedstatedi=* \
+  | --sharedstated=* | --sharedstate=* | --sharedstat=* | --sharedsta=* \
+  | --sharedst=* | --shareds=* | --shared=* | --share=* | --shar=* \
+  | --sha=* | --sh=*)
+    sharedstatedir=$ac_optarg ;;
+
+  -site | --site | --sit)
+    ac_prev=site ;;
+  -site=* | --site=* | --sit=*)
+    site=$ac_optarg ;;
+
+  -srcdir | --srcdir | --srcdi | --srcd | --src | --sr)
+    ac_prev=srcdir ;;
+  -srcdir=* | --srcdir=* | --srcdi=* | --srcd=* | --src=* | --sr=*)
+    srcdir=$ac_optarg ;;
+
+  -sysconfdir | --sysconfdir | --sysconfdi | --sysconfd | --sysconf \
+  | --syscon | --sysco | --sysc | --sys | --sy)
+    ac_prev=sysconfdir ;;
+  -sysconfdir=* | --sysconfdir=* | --sysconfdi=* | --sysconfd=* | --sysconf=* \
+  | --syscon=* | --sysco=* | --sysc=* | --sys=* | --sy=*)
+    sysconfdir=$ac_optarg ;;
+
+  -target | --target | --targe | --targ | --tar | --ta | --t)
+    ac_prev=target_alias ;;
+  -target=* | --target=* | --targe=* | --targ=* | --tar=* | --ta=* | --t=*)
+    target_alias=$ac_optarg ;;
+
+  -v | -verbose | --verbose | --verbos | --verbo | --verb)
+    verbose=yes ;;
+
+  -version | --version | --versio | --versi | --vers | -V)
+    ac_init_version=: ;;
+
+  -with-* | --with-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*with-\([^=]*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid package name: '$ac_useropt'"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`printf "%s\n" "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"with_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--with-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval with_$ac_useropt=\$ac_optarg ;;
+
+  -without-* | --without-*)
+    ac_useropt=`expr "x$ac_option" : 'x-*without-\(.*\)'`
+    # Reject names that are not valid shell variable names.
+    expr "x$ac_useropt" : ".*[^-+._$as_cr_alnum]" >/dev/null &&
+      as_fn_error $? "invalid package name: '$ac_useropt'"
+    ac_useropt_orig=$ac_useropt
+    ac_useropt=`printf "%s\n" "$ac_useropt" | sed 's/[-+.]/_/g'`
+    case $ac_user_opts in
+      *"
+"with_$ac_useropt"
+"*) ;;
+      *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--without-$ac_useropt_orig"
+	 ac_unrecognized_sep=', ';;
+    esac
+    eval with_$ac_useropt=no ;;
+
+  --x)
+    # Obsolete; use --with-x.
+    with_x=yes ;;
+
+  -x-includes | --x-includes | --x-include | --x-includ | --x-inclu \
+  | --x-incl | --x-inc | --x-in | --x-i)
+    ac_prev=x_includes ;;
+  -x-includes=* | --x-includes=* | --x-include=* | --x-includ=* | --x-inclu=* \
+  | --x-incl=* | --x-inc=* | --x-in=* | --x-i=*)
+    x_includes=$ac_optarg ;;
+
+  -x-libraries | --x-libraries | --x-librarie | --x-librari \
+  | --x-librar | --x-libra | --x-libr | --x-lib | --x-li | --x-l)
+    ac_prev=x_libraries ;;
+  -x-libraries=* | --x-libraries=* | --x-librarie=* | --x-librari=* \
+  | --x-librar=* | --x-libra=* | --x-libr=* | --x-lib=* | --x-li=* | --x-l=*)
+    x_libraries=$ac_optarg ;;
+
+  -*) as_fn_error $? "unrecognized option: '$ac_option'
+Try '$0 --help' for more information"
+    ;;
+
+  *=*)
+    ac_envvar=`expr "x$ac_option" : 'x\([^=]*\)='`
+    # Reject names that are not valid shell variable names.
+    case $ac_envvar in #(
+      '' | [0-9]* | *[!_$as_cr_alnum]* )
+      as_fn_error $? "invalid variable name: '$ac_envvar'" ;;
+    esac
+    eval $ac_envvar=\$ac_optarg
+    export $ac_envvar ;;
+
+  *)
+    # FIXME: should be removed in autoconf 3.0.
+    printf "%s\n" "$as_me: WARNING: you should use --build, --host, --target" >&2
+    expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
+      printf "%s\n" "$as_me: WARNING: invalid host type: $ac_option" >&2
+    : "${build_alias=$ac_option} ${host_alias=$ac_option} ${target_alias=$ac_option}"
+    ;;
+
+  esac
+done
+
+if test -n "$ac_prev"; then
+  ac_option=--`echo $ac_prev | sed 's/_/-/g'`
+  as_fn_error $? "missing argument to $ac_option"
+fi
+
+if test -n "$ac_unrecognized_opts"; then
+  case $enable_option_checking in
+    no) ;;
+    fatal) as_fn_error $? "unrecognized options: $ac_unrecognized_opts" ;;
+    *)     printf "%s\n" "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2 ;;
+  esac
+fi
+
+# Check all directory arguments for consistency.
+for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
+		datadir sysconfdir sharedstatedir localstatedir includedir \
+		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
+		libdir localedir mandir runstatedir
+do
+  eval ac_val=\$$ac_var
+  # Remove trailing slashes.
+  case $ac_val in
+    */ )
+      ac_val=`expr "X$ac_val" : 'X\(.*[^/]\)' \| "X$ac_val" : 'X\(.*\)'`
+      eval $ac_var=\$ac_val;;
+  esac
+  # Be sure to have absolute directory names.
+  case $ac_val in
+    [\\/$]* | ?:[\\/]* )  continue;;
+    NONE | '' ) case $ac_var in *prefix ) continue;; esac;;
+  esac
+  as_fn_error $? "expected an absolute directory name for --$ac_var: $ac_val"
+done
+
+# There might be people who depend on the old broken behavior: '$host'
+# used to hold the argument of --host etc.
+# FIXME: To remove some day.
+build=$build_alias
+host=$host_alias
+target=$target_alias
+
+# FIXME: To remove some day.
+if test "x$host_alias" != x; then
+  if test "x$build_alias" = x; then
+    cross_compiling=maybe
+  elif test "x$build_alias" != "x$host_alias"; then
+    cross_compiling=yes
+  fi
+fi
+
+ac_tool_prefix=
+test -n "$host_alias" && ac_tool_prefix=$host_alias-
+
+test "$silent" = yes && exec 6>/dev/null
+
+
+ac_pwd=`pwd` && test -n "$ac_pwd" &&
+ac_ls_di=`ls -di .` &&
+ac_pwd_ls_di=`cd "$ac_pwd" && ls -di .` ||
+  as_fn_error $? "working directory cannot be determined"
+test "X$ac_ls_di" = "X$ac_pwd_ls_di" ||
+  as_fn_error $? "pwd does not report name of working directory"
+
+
+# Find the source files, if location was not specified.
+if test -z "$srcdir"; then
+  ac_srcdir_defaulted=yes
+  # Try the directory containing this script, then the parent directory.
+  ac_confdir=`$as_dirname -- "$as_myself" ||
+$as_expr X"$as_myself" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_myself" : 'X\(//\)[^/]' \| \
+	 X"$as_myself" : 'X\(//\)$' \| \
+	 X"$as_myself" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X"$as_myself" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+  srcdir=$ac_confdir
+  if test ! -r "$srcdir/$ac_unique_file"; then
+    srcdir=..
+  fi
+else
+  ac_srcdir_defaulted=no
+fi
+if test ! -r "$srcdir/$ac_unique_file"; then
+  test "$ac_srcdir_defaulted" = yes && srcdir="$ac_confdir or .."
+  as_fn_error $? "cannot find sources ($ac_unique_file) in $srcdir"
+fi
+ac_msg="sources are in $srcdir, but 'cd $srcdir' does not work"
+ac_abs_confdir=`(
+	cd "$srcdir" && test -r "./$ac_unique_file" || as_fn_error $? "$ac_msg"
+	pwd)`
+# When building in place, set srcdir=.
+if test "$ac_abs_confdir" = "$ac_pwd"; then
+  srcdir=.
+fi
+# Remove unnecessary trailing slashes from srcdir.
+# Double slashes in file names in object file debugging info
+# mess up M-x gdb in Emacs.
+case $srcdir in
+*/) srcdir=`expr "X$srcdir" : 'X\(.*[^/]\)' \| "X$srcdir" : 'X\(.*\)'`;;
+esac
+for ac_var in $ac_precious_vars; do
+  eval ac_env_${ac_var}_set=\${${ac_var}+set}
+  eval ac_env_${ac_var}_value=\$${ac_var}
+  eval ac_cv_env_${ac_var}_set=\${${ac_var}+set}
+  eval ac_cv_env_${ac_var}_value=\$${ac_var}
+done
+
+#
+# Report the --help message.
+#
+if test "$ac_init_help" = "long"; then
+  # Omit some internal or obsolete options to make the list less imposing.
+  # This message is too long to be a string in the A/UX 3.1 sh.
+  cat <<_ACEOF
+'configure' configures Haskell network package 3.2.7.0 to adapt to many kinds of systems.
+
+Usage: $0 [OPTION]... [VAR=VALUE]...
+
+To assign environment variables (e.g., CC, CFLAGS...), specify them as
+VAR=VALUE.  See below for descriptions of some of the useful variables.
+
+Defaults for the options are specified in brackets.
+
+Configuration:
+  -h, --help              display this help and exit
+      --help=short        display options specific to this package
+      --help=recursive    display the short help of all the included packages
+  -V, --version           display version information and exit
+  -q, --quiet, --silent   do not print 'checking ...' messages
+      --cache-file=FILE   cache test results in FILE [disabled]
+  -C, --config-cache      alias for '--cache-file=config.cache'
+  -n, --no-create         do not create output files
+      --srcdir=DIR        find the sources in DIR [configure dir or '..']
+
+Installation directories:
+  --prefix=PREFIX         install architecture-independent files in PREFIX
+                          [$ac_default_prefix]
+  --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
+                          [PREFIX]
+
+By default, 'make install' will install all the files in
+'$ac_default_prefix/bin', '$ac_default_prefix/lib' etc.  You can specify
+an installation prefix other than '$ac_default_prefix' using '--prefix',
+for instance '--prefix=\$HOME'.
+
+For better control, use the options below.
+
+Fine tuning of the installation directories:
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/network]
+  --htmldir=DIR           html documentation [DOCDIR]
+  --dvidir=DIR            dvi documentation [DOCDIR]
+  --pdfdir=DIR            pdf documentation [DOCDIR]
+  --psdir=DIR             ps documentation [DOCDIR]
+_ACEOF
+
+  cat <<\_ACEOF
+
+System types:
+  --build=BUILD     configure for building on BUILD [guessed]
+  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
+_ACEOF
+fi
+
+if test -n "$ac_init_help"; then
+  case $ac_init_help in
+     short | recursive ) echo "Configuration of Haskell network package 3.2.7.0:";;
+   esac
+  cat <<\_ACEOF
+
+Optional Packages:
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+C compiler
+
+Some influential environment variables:
+  CC          C compiler command
+  CFLAGS      C compiler flags
+  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
+              nonstandard directory <lib dir>
+  LIBS        libraries to pass to the linker, e.g. -l<library>
+  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+
+Use these variables to override the choices made by 'configure' or to help
+it to find libraries and programs with nonstandard names/locations.
+
+Report bugs to <libraries@haskell.org>.
+_ACEOF
+ac_status=$?
+fi
+
+if test "$ac_init_help" = "recursive"; then
+  # If there are subdirs, report their specific --help.
+  for ac_dir in : $ac_subdirs_all; do test "x$ac_dir" = x: && continue
+    test -d "$ac_dir" ||
+      { cd "$srcdir" && ac_pwd=`pwd` && srcdir=. && test -d "$ac_dir"; } ||
+      continue
+    ac_builddir=.
+
+case "$ac_dir" in
+.) ac_dir_suffix= ac_top_builddir_sub=. ac_top_build_prefix= ;;
+*)
+  ac_dir_suffix=/`printf "%s\n" "$ac_dir" | sed 's|^\.[\\/]||'`
+  # A ".." for each directory in $ac_dir_suffix.
+  ac_top_builddir_sub=`printf "%s\n" "$ac_dir_suffix" | sed 's|/[^\\/]*|/..|g;s|/||'`
+  case $ac_top_builddir_sub in
+  "") ac_top_builddir_sub=. ac_top_build_prefix= ;;
+  *)  ac_top_build_prefix=$ac_top_builddir_sub/ ;;
+  esac ;;
+esac
+ac_abs_top_builddir=$ac_pwd
+ac_abs_builddir=$ac_pwd$ac_dir_suffix
+# for backward compatibility:
+ac_top_builddir=$ac_top_build_prefix
+
+case $srcdir in
+  .)  # We are building in place.
+    ac_srcdir=.
+    ac_top_srcdir=$ac_top_builddir_sub
+    ac_abs_top_srcdir=$ac_pwd ;;
+  [\\/]* | ?:[\\/]* )  # Absolute name.
+    ac_srcdir=$srcdir$ac_dir_suffix;
+    ac_top_srcdir=$srcdir
+    ac_abs_top_srcdir=$srcdir ;;
+  *) # Relative name.
+    ac_srcdir=$ac_top_build_prefix$srcdir$ac_dir_suffix
+    ac_top_srcdir=$ac_top_build_prefix$srcdir
+    ac_abs_top_srcdir=$ac_pwd/$srcdir ;;
+esac
+ac_abs_srcdir=$ac_abs_top_srcdir$ac_dir_suffix
+
+    cd "$ac_dir" || { ac_status=$?; continue; }
+    # Check for configure.gnu first; this name is used for a wrapper for
+    # Metaconfig's "Configure" on case-insensitive file systems.
+    if test -f "$ac_srcdir/configure.gnu"; then
+      echo &&
+      $SHELL "$ac_srcdir/configure.gnu" --help=recursive
+    elif test -f "$ac_srcdir/configure"; then
+      echo &&
+      $SHELL "$ac_srcdir/configure" --help=recursive
+    else
+      printf "%s\n" "$as_me: WARNING: no configuration information is in $ac_dir" >&2
+    fi || ac_status=$?
+    cd "$ac_pwd" || { ac_status=$?; break; }
+  done
+fi
+
+test -n "$ac_init_help" && exit $ac_status
+if $ac_init_version; then
+  cat <<\_ACEOF
+Haskell network package configure 3.2.7.0
+generated by GNU Autoconf 2.72
+
+Copyright (C) 2023 Free Software Foundation, Inc.
+This configure script is free software; the Free Software Foundation
+gives unlimited permission to copy, distribute and modify it.
+_ACEOF
+  exit
+fi
+
+## ------------------------ ##
+## Autoconf initialization. ##
+## ------------------------ ##
+
+# ac_fn_c_try_compile LINENO
+# --------------------------
+# Try to compile conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext conftest.beam
+  if { { ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_compile") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext
+then :
+  ac_retval=0
+else case e in #(
+  e) printf "%s\n" "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1 ;;
+esac
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_compile
+
+# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_c_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+printf %s "checking for $2... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$3=yes"
+else case e in #(
+  e) eval "$3=no" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_compile
+
+# ac_fn_c_check_type LINENO TYPE VAR INCLUDES
+# -------------------------------------------
+# Tests whether TYPE exists after having included INCLUDES, setting cache
+# variable VAR accordingly.
+ac_fn_c_check_type ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+printf %s "checking for $2... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) eval "$3=no"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main (void)
+{
+if (sizeof ($2))
+	 return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main (void)
+{
+if (sizeof (($2)))
+	    return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+
+else case e in #(
+  e) eval "$3=yes" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_type
+
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_link ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext conftest.beam conftest$ac_exeext
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 test -x conftest$ac_exeext
+       }
+then :
+  ac_retval=0
+else case e in #(
+  e) printf "%s\n" "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1 ;;
+esac
+fi
+  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
+  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
+  # interfere with the next link command; also delete a directory that is
+  # left behind by Apple's compiler.  We do this before executing the actions.
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_link
+
+# ac_fn_c_check_func LINENO FUNC VAR
+# ----------------------------------
+# Tests whether FUNC exists, setting the cache variable VAR accordingly
+ac_fn_c_check_func ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+printf %s "checking for $2... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+/* Define $2 to an innocuous variant, in case <limits.h> declares $2.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define $2 innocuous_$2
+
+/* System header to define __stub macros and hopefully few prototypes,
+   which can conflict with char $2 (void); below.  */
+
+#include <limits.h>
+#undef $2
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char $2 (void);
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined __stub_$2 || defined __stub___$2
+choke me
+#endif
+
+int
+main (void)
+{
+return $2 ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"
+then :
+  eval "$3=yes"
+else case e in #(
+  e) eval "$3=no" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam \
+    conftest$ac_exeext conftest.$ac_ext ;;
+esac
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_func
+
+# ac_fn_check_decl LINENO SYMBOL VAR INCLUDES EXTRA-OPTIONS FLAG-VAR
+# ------------------------------------------------------------------
+# Tests whether SYMBOL is declared in INCLUDES, setting cache variable VAR
+# accordingly. Pass EXTRA-OPTIONS to the compiler, using FLAG-VAR.
+ac_fn_check_decl ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  as_decl_name=`echo $2|sed 's/ *(.*//'`
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
+printf %s "checking whether $as_decl_name is declared... " >&6; }
+if eval test \${$3+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
+  eval ac_save_FLAGS=\$$6
+  as_fn_append $6 " $5"
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main (void)
+{
+#ifndef $as_decl_name
+#ifdef __cplusplus
+  (void) $as_decl_use;
+#else
+  (void) $as_decl_name;
+#endif
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$3=yes"
+else case e in #(
+  e) eval "$3=no" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+  eval $6=\$ac_save_FLAGS
+ ;;
+esac
+fi
+eval ac_res=\$$3
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_check_decl
+
+# ac_fn_c_check_member LINENO AGGR MEMBER VAR INCLUDES
+# ----------------------------------------------------
+# Tries to find if the field MEMBER exists in type AGGR, after including
+# INCLUDES, setting cache variable VAR accordingly.
+ac_fn_c_check_member ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $2.$3" >&5
+printf %s "checking for $2.$3... " >&6; }
+if eval test \${$4+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$5
+int
+main (void)
+{
+static $2 ac_aggr;
+if (ac_aggr.$3)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$4=yes"
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$5
+int
+main (void)
+{
+static $2 ac_aggr;
+if (sizeof ac_aggr.$3)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  eval "$4=yes"
+else case e in #(
+  e) eval "$4=no" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+eval ac_res=\$$4
+	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+printf "%s\n" "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_member
+ac_configure_args_raw=
+for ac_arg
+do
+  case $ac_arg in
+  *\'*)
+    ac_arg=`printf "%s\n" "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
+  esac
+  as_fn_append ac_configure_args_raw " '$ac_arg'"
+done
+
+case $ac_configure_args_raw in
+  *$as_nl*)
+    ac_safe_unquote= ;;
+  *)
+    ac_unsafe_z='|&;<>()$`\\"*?[ ''	' # This string ends in space, tab.
+    ac_unsafe_a="$ac_unsafe_z#~"
+    ac_safe_unquote="s/ '\\([^$ac_unsafe_a][^$ac_unsafe_z]*\\)'/ \\1/g"
+    ac_configure_args_raw=`      printf "%s\n" "$ac_configure_args_raw" | sed "$ac_safe_unquote"`;;
+esac
+
+cat >config.log <<_ACEOF
+This file contains any messages produced by compilers while
+running configure, to aid debugging if configure makes a mistake.
+
+It was created by Haskell network package $as_me 3.2.7.0, which was
+generated by GNU Autoconf 2.72.  Invocation command line was
+
+  $ $0$ac_configure_args_raw
+
+_ACEOF
+exec 5>>config.log
+{
+cat <<_ASUNAME
+## --------- ##
+## Platform. ##
+## --------- ##
+
+hostname = `(hostname || uname -n) 2>/dev/null | sed 1q`
+uname -m = `(uname -m) 2>/dev/null || echo unknown`
+uname -r = `(uname -r) 2>/dev/null || echo unknown`
+uname -s = `(uname -s) 2>/dev/null || echo unknown`
+uname -v = `(uname -v) 2>/dev/null || echo unknown`
+
+/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null || echo unknown`
+/bin/uname -X     = `(/bin/uname -X) 2>/dev/null     || echo unknown`
+
+/bin/arch              = `(/bin/arch) 2>/dev/null              || echo unknown`
+/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null       || echo unknown`
+/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null || echo unknown`
+/usr/bin/hostinfo      = `(/usr/bin/hostinfo) 2>/dev/null      || echo unknown`
+/bin/machine           = `(/bin/machine) 2>/dev/null           || echo unknown`
+/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null       || echo unknown`
+/bin/universe          = `(/bin/universe) 2>/dev/null          || echo unknown`
+
+_ASUNAME
+
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    printf "%s\n" "PATH: $as_dir"
+  done
+IFS=$as_save_IFS
+
+} >&5
+
+cat >&5 <<_ACEOF
+
+
+## ----------- ##
+## Core tests. ##
+## ----------- ##
+
+_ACEOF
+
+
+# Keep a trace of the command line.
+# Strip out --no-create and --no-recursion so they do not pile up.
+# Strip out --silent because we don't want to record it for future runs.
+# Also quote any args containing shell meta-characters.
+# Make two passes to allow for proper duplicate-argument suppression.
+ac_configure_args=
+ac_configure_args0=
+ac_configure_args1=
+ac_must_keep_next=false
+for ac_pass in 1 2
+do
+  for ac_arg
+  do
+    case $ac_arg in
+    -no-create | --no-c* | -n | -no-recursion | --no-r*) continue ;;
+    -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+    | -silent | --silent | --silen | --sile | --sil)
+      continue ;;
+    *\'*)
+      ac_arg=`printf "%s\n" "$ac_arg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    case $ac_pass in
+    1) as_fn_append ac_configure_args0 " '$ac_arg'" ;;
+    2)
+      as_fn_append ac_configure_args1 " '$ac_arg'"
+      if test $ac_must_keep_next = true; then
+	ac_must_keep_next=false # Got value, back to normal.
+      else
+	case $ac_arg in
+	  *=* | --config-cache | -C | -disable-* | --disable-* \
+	  | -enable-* | --enable-* | -gas | --g* | -nfp | --nf* \
+	  | -q | -quiet | --q* | -silent | --sil* | -v | -verb* \
+	  | -with-* | --with-* | -without-* | --without-* | --x)
+	    case "$ac_configure_args0 " in
+	      "$ac_configure_args1"*" '$ac_arg' "* ) continue ;;
+	    esac
+	    ;;
+	  -* ) ac_must_keep_next=true ;;
+	esac
+      fi
+      as_fn_append ac_configure_args " '$ac_arg'"
+      ;;
+    esac
+  done
+done
+{ ac_configure_args0=; unset ac_configure_args0;}
+{ ac_configure_args1=; unset ac_configure_args1;}
+
+# When interrupted or exit'd, cleanup temporary files, and complete
+# config.log.  We remove comments because anyway the quotes in there
+# would cause problems or look ugly.
+# WARNING: Use '\'' to represent an apostrophe within the trap.
+# WARNING: Do not start the trap code with a newline, due to a FreeBSD 4.0 bug.
+trap 'exit_status=$?
+  # Sanitize IFS.
+  IFS=" ""	$as_nl"
+  # Save into config.log some information that might help in debugging.
+  {
+    echo
+
+    printf "%s\n" "## ---------------- ##
+## Cache variables. ##
+## ---------------- ##"
+    echo
+    # The following way of writing the cache mishandles newlines in values,
+(
+  for ac_var in `(set) 2>&1 | sed -n '\''s/^\([a-zA-Z_][a-zA-Z0-9_]*\)=.*/\1/p'\''`; do
+    eval ac_val=\$$ac_var
+    case $ac_val in #(
+    *${as_nl}*)
+      case $ac_var in #(
+      *_cv_*) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+printf "%s\n" "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
+      esac
+      case $ac_var in #(
+      _ | IFS | as_nl) ;; #(
+      BASH_ARGV | BASH_SOURCE) eval $ac_var= ;; #(
+      *) { eval $ac_var=; unset $ac_var;} ;;
+      esac ;;
+    esac
+  done
+  (set) 2>&1 |
+    case $as_nl`(ac_space='\'' '\''; set) 2>&1` in #(
+    *${as_nl}ac_space=\ *)
+      sed -n \
+	"s/'\''/'\''\\\\'\'''\''/g;
+	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\''\\2'\''/p"
+      ;; #(
+    *)
+      sed -n "/^[_$as_cr_alnum]*_cv_[_$as_cr_alnum]*=/p"
+      ;;
+    esac |
+    sort
+)
+    echo
+
+    printf "%s\n" "## ----------------- ##
+## Output variables. ##
+## ----------------- ##"
+    echo
+    for ac_var in $ac_subst_vars
+    do
+      eval ac_val=\$$ac_var
+      case $ac_val in
+      *\'\''*) ac_val=`printf "%s\n" "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+      esac
+      printf "%s\n" "$ac_var='\''$ac_val'\''"
+    done | sort
+    echo
+
+    if test -n "$ac_subst_files"; then
+      printf "%s\n" "## ------------------- ##
+## File substitutions. ##
+## ------------------- ##"
+      echo
+      for ac_var in $ac_subst_files
+      do
+	eval ac_val=\$$ac_var
+	case $ac_val in
+	*\'\''*) ac_val=`printf "%s\n" "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+	esac
+	printf "%s\n" "$ac_var='\''$ac_val'\''"
+      done | sort
+      echo
+    fi
+
+    if test -s confdefs.h; then
+      printf "%s\n" "## ----------- ##
+## confdefs.h. ##
+## ----------- ##"
+      echo
+      cat confdefs.h
+      echo
+    fi
+    test "$ac_signal" != 0 &&
+      printf "%s\n" "$as_me: caught signal $ac_signal"
+    printf "%s\n" "$as_me: exit $exit_status"
+  } >&5
+  rm -f core *.core core.conftest.* &&
+    rm -f -r conftest* confdefs* conf$$* $ac_clean_files &&
+    exit $exit_status
+' 0
+for ac_signal in 1 2 13 15; do
+  trap 'ac_signal='$ac_signal'; as_fn_exit 1' $ac_signal
+done
+ac_signal=0
+
+# confdefs.h avoids OS command line length limits that DEFS can exceed.
+rm -f -r conftest* confdefs.h
+
+printf "%s\n" "/* confdefs.h */" > confdefs.h
+
+# Predefined preprocessor variables.
+
+printf "%s\n" "#define PACKAGE_NAME \"$PACKAGE_NAME\"" >>confdefs.h
+
+printf "%s\n" "#define PACKAGE_TARNAME \"$PACKAGE_TARNAME\"" >>confdefs.h
+
+printf "%s\n" "#define PACKAGE_VERSION \"$PACKAGE_VERSION\"" >>confdefs.h
+
+printf "%s\n" "#define PACKAGE_STRING \"$PACKAGE_STRING\"" >>confdefs.h
+
+printf "%s\n" "#define PACKAGE_BUGREPORT \"$PACKAGE_BUGREPORT\"" >>confdefs.h
+
+printf "%s\n" "#define PACKAGE_URL \"$PACKAGE_URL\"" >>confdefs.h
+
+
+# Let the site file select an alternate cache file if it wants to.
+# Prefer an explicitly selected file to automatically selected ones.
+if test -n "$CONFIG_SITE"; then
+  ac_site_files="$CONFIG_SITE"
+elif test "x$prefix" != xNONE; then
+  ac_site_files="$prefix/share/config.site $prefix/etc/config.site"
+else
+  ac_site_files="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site"
+fi
+
+for ac_site_file in $ac_site_files
+do
+  case $ac_site_file in #(
+  */*) :
+     ;; #(
+  *) :
+    ac_site_file=./$ac_site_file ;;
+esac
+  if test -f "$ac_site_file" && test -r "$ac_site_file"; then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: loading site script $ac_site_file" >&5
+printf "%s\n" "$as_me: loading site script $ac_site_file" >&6;}
+    sed 's/^/| /' "$ac_site_file" >&5
+    . "$ac_site_file" \
+      || { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "failed to load site script $ac_site_file
+See 'config.log' for more details" "$LINENO" 5; }
+  fi
+done
+
+if test -r "$cache_file"; then
+  # Some versions of bash will fail to source /dev/null (special files
+  # actually), so we avoid doing that.  DJGPP emulates it as a regular file.
+  if test /dev/null != "$cache_file" && test -f "$cache_file"; then
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: loading cache $cache_file" >&5
+printf "%s\n" "$as_me: loading cache $cache_file" >&6;}
+    case $cache_file in
+      [\\/]* | ?:[\\/]* ) . "$cache_file";;
+      *)                      . "./$cache_file";;
+    esac
+  fi
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: creating cache $cache_file" >&5
+printf "%s\n" "$as_me: creating cache $cache_file" >&6;}
+  >$cache_file
+fi
+
+# Test code for whether the C compiler supports C89 (global declarations)
+ac_c_conftest_c89_globals='
+/* Does the compiler advertise C89 conformance?
+   Do not test the value of __STDC__, because some compilers set it to 0
+   while being otherwise adequately conformant. */
+#if !defined __STDC__
+# error "Compiler does not advertise C89 conformance"
+#endif
+
+#include <stddef.h>
+#include <stdarg.h>
+struct stat;
+/* Most of the following tests are stolen from RCS 5.7 src/conf.sh.  */
+struct buf { int x; };
+struct buf * (*rcsopen) (struct buf *, struct stat *, int);
+static char *e (char **p, int i)
+{
+  return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+  char *s;
+  va_list v;
+  va_start (v,p);
+  s = g (p, va_arg (v,int));
+  va_end (v);
+  return s;
+}
+
+/* C89 style stringification. */
+#define noexpand_stringify(a) #a
+const char *stringified = noexpand_stringify(arbitrary+token=sequence);
+
+/* C89 style token pasting.  Exercises some of the corner cases that
+   e.g. old MSVC gets wrong, but not very hard. */
+#define noexpand_concat(a,b) a##b
+#define expand_concat(a,b) noexpand_concat(a,b)
+extern int vA;
+extern int vbee;
+#define aye A
+#define bee B
+int *pvA = &expand_concat(v,aye);
+int *pvbee = &noexpand_concat(v,bee);
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not \xHH hex character constants.
+   These do not provoke an error unfortunately, instead are silently treated
+   as an "x".  The following induces an error, until -std is added to get
+   proper ANSI mode.  Curiously \x00 != x always comes out true, for an
+   array size at least.  It is necessary to write \x00 == 0 to get something
+   that is true only with -std.  */
+int osf4_cc_array ['\''\x00'\'' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+   inside strings and character constants.  */
+#define FOO(x) '\''x'\''
+int xlc6_cc_array[FOO(a) == '\''x'\'' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, int *(*)(struct buf *, struct stat *, int),
+               int, int);'
+
+# Test code for whether the C compiler supports C89 (body of main).
+ac_c_conftest_c89_main='
+ok |= (argc == 0 || f (e, argv, 0) != argv[0] || f (e, argv, 1) != argv[1]);
+'
+
+# Test code for whether the C compiler supports C99 (global declarations)
+ac_c_conftest_c99_globals='
+/* Does the compiler advertise C99 conformance? */
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 199901L
+# error "Compiler does not advertise C99 conformance"
+#endif
+
+// See if C++-style comments work.
+
+#include <stdbool.h>
+extern int puts (const char *);
+extern int printf (const char *, ...);
+extern int dprintf (int, const char *, ...);
+extern void *malloc (size_t);
+extern void free (void *);
+
+// Check varargs macros.  These examples are taken from C99 6.10.3.5.
+// dprintf is used instead of fprintf to avoid needing to declare
+// FILE and stderr.
+#define debug(...) dprintf (2, __VA_ARGS__)
+#define showlist(...) puts (#__VA_ARGS__)
+#define report(test,...) ((test) ? puts (#test) : printf (__VA_ARGS__))
+static void
+test_varargs_macros (void)
+{
+  int x = 1234;
+  int y = 5678;
+  debug ("Flag");
+  debug ("X = %d\n", x);
+  showlist (The first, second, and third items.);
+  report (x>y, "x is %d but y is %d", x, y);
+}
+
+// Check long long types.
+#define BIG64 18446744073709551615ull
+#define BIG32 4294967295ul
+#define BIG_OK (BIG64 / BIG32 == 4294967297ull && BIG64 % BIG32 == 0)
+#if !BIG_OK
+  #error "your preprocessor is broken"
+#endif
+#if BIG_OK
+#else
+  #error "your preprocessor is broken"
+#endif
+static long long int bignum = -9223372036854775807LL;
+static unsigned long long int ubignum = BIG64;
+
+struct incomplete_array
+{
+  int datasize;
+  double data[];
+};
+
+struct named_init {
+  int number;
+  const wchar_t *name;
+  double average;
+};
+
+typedef const char *ccp;
+
+static inline int
+test_restrict (ccp restrict text)
+{
+  // Iterate through items via the restricted pointer.
+  // Also check for declarations in for loops.
+  for (unsigned int i = 0; *(text+i) != '\''\0'\''; ++i)
+    continue;
+  return 0;
+}
+
+// Check varargs and va_copy.
+static bool
+test_varargs (const char *format, ...)
+{
+  va_list args;
+  va_start (args, format);
+  va_list args_copy;
+  va_copy (args_copy, args);
+
+  const char *str = "";
+  int number = 0;
+  float fnumber = 0;
+
+  while (*format)
+    {
+      switch (*format++)
+	{
+	case '\''s'\'': // string
+	  str = va_arg (args_copy, const char *);
+	  break;
+	case '\''d'\'': // int
+	  number = va_arg (args_copy, int);
+	  break;
+	case '\''f'\'': // float
+	  fnumber = va_arg (args_copy, double);
+	  break;
+	default:
+	  break;
+	}
+    }
+  va_end (args_copy);
+  va_end (args);
+
+  return *str && number && fnumber;
+}
+'
+
+# Test code for whether the C compiler supports C99 (body of main).
+ac_c_conftest_c99_main='
+  // Check bool.
+  _Bool success = false;
+  success |= (argc != 0);
+
+  // Check restrict.
+  if (test_restrict ("String literal") == 0)
+    success = true;
+  char *restrict newvar = "Another string";
+
+  // Check varargs.
+  success &= test_varargs ("s, d'\'' f .", "string", 65, 34.234);
+  test_varargs_macros ();
+
+  // Check flexible array members.
+  struct incomplete_array *ia =
+    malloc (sizeof (struct incomplete_array) + (sizeof (double) * 10));
+  ia->datasize = 10;
+  for (int i = 0; i < ia->datasize; ++i)
+    ia->data[i] = i * 1.234;
+  // Work around memory leak warnings.
+  free (ia);
+
+  // Check named initializers.
+  struct named_init ni = {
+    .number = 34,
+    .name = L"Test wide string",
+    .average = 543.34343,
+  };
+
+  ni.number = 58;
+
+  int dynamic_array[ni.number];
+  dynamic_array[0] = argv[0][0];
+  dynamic_array[ni.number - 1] = 543;
+
+  // work around unused variable warnings
+  ok |= (!success || bignum == 0LL || ubignum == 0uLL || newvar[0] == '\''x'\''
+	 || dynamic_array[ni.number - 1] != 543);
+'
+
+# Test code for whether the C compiler supports C11 (global declarations)
+ac_c_conftest_c11_globals='
+/* Does the compiler advertise C11 conformance? */
+#if !defined __STDC_VERSION__ || __STDC_VERSION__ < 201112L
+# error "Compiler does not advertise C11 conformance"
+#endif
+
+// Check _Alignas.
+char _Alignas (double) aligned_as_double;
+char _Alignas (0) no_special_alignment;
+extern char aligned_as_int;
+char _Alignas (0) _Alignas (int) aligned_as_int;
+
+// Check _Alignof.
+enum
+{
+  int_alignment = _Alignof (int),
+  int_array_alignment = _Alignof (int[100]),
+  char_alignment = _Alignof (char)
+};
+_Static_assert (0 < -_Alignof (int), "_Alignof is signed");
+
+// Check _Noreturn.
+int _Noreturn does_not_return (void) { for (;;) continue; }
+
+// Check _Static_assert.
+struct test_static_assert
+{
+  int x;
+  _Static_assert (sizeof (int) <= sizeof (long int),
+                  "_Static_assert does not work in struct");
+  long int y;
+};
+
+// Check UTF-8 literals.
+#define u8 syntax error!
+char const utf8_literal[] = u8"happens to be ASCII" "another string";
+
+// Check duplicate typedefs.
+typedef long *long_ptr;
+typedef long int *long_ptr;
+typedef long_ptr long_ptr;
+
+// Anonymous structures and unions -- taken from C11 6.7.2.1 Example 1.
+struct anonymous
+{
+  union {
+    struct { int i; int j; };
+    struct { int k; long int l; } w;
+  };
+  int m;
+} v1;
+'
+
+# Test code for whether the C compiler supports C11 (body of main).
+ac_c_conftest_c11_main='
+  _Static_assert ((offsetof (struct anonymous, i)
+		   == offsetof (struct anonymous, w.k)),
+		  "Anonymous union alignment botch");
+  v1.i = 2;
+  v1.w.k = 5;
+  ok |= v1.i != 5;
+'
+
+# Test code for whether the C compiler supports C11 (complete).
+ac_c_conftest_c11_program="${ac_c_conftest_c89_globals}
+${ac_c_conftest_c99_globals}
+${ac_c_conftest_c11_globals}
+
+int
+main (int argc, char **argv)
+{
+  int ok = 0;
+  ${ac_c_conftest_c89_main}
+  ${ac_c_conftest_c99_main}
+  ${ac_c_conftest_c11_main}
+  return ok;
+}
+"
+
+# Test code for whether the C compiler supports C99 (complete).
+ac_c_conftest_c99_program="${ac_c_conftest_c89_globals}
+${ac_c_conftest_c99_globals}
+
+int
+main (int argc, char **argv)
+{
+  int ok = 0;
+  ${ac_c_conftest_c89_main}
+  ${ac_c_conftest_c99_main}
+  return ok;
+}
+"
+
+# Test code for whether the C compiler supports C89 (complete).
+ac_c_conftest_c89_program="${ac_c_conftest_c89_globals}
+
+int
+main (int argc, char **argv)
+{
+  int ok = 0;
+  ${ac_c_conftest_c89_main}
+  return ok;
+}
+"
+
+as_fn_append ac_header_c_list " stdio.h stdio_h HAVE_STDIO_H"
+as_fn_append ac_header_c_list " stdlib.h stdlib_h HAVE_STDLIB_H"
+as_fn_append ac_header_c_list " string.h string_h HAVE_STRING_H"
+as_fn_append ac_header_c_list " inttypes.h inttypes_h HAVE_INTTYPES_H"
+as_fn_append ac_header_c_list " stdint.h stdint_h HAVE_STDINT_H"
+as_fn_append ac_header_c_list " strings.h strings_h HAVE_STRINGS_H"
+as_fn_append ac_header_c_list " sys/stat.h sys_stat_h HAVE_SYS_STAT_H"
+as_fn_append ac_header_c_list " sys/types.h sys_types_h HAVE_SYS_TYPES_H"
+as_fn_append ac_header_c_list " unistd.h unistd_h HAVE_UNISTD_H"
+
+# Auxiliary files required by this configure script.
+ac_aux_files="config.guess config.sub"
+
+# Locations in which to look for auxiliary files.
+ac_aux_dir_candidates="${srcdir}${PATH_SEPARATOR}${srcdir}/..${PATH_SEPARATOR}${srcdir}/../.."
+
+# Search for a directory containing all of the required auxiliary files,
+# $ac_aux_files, from the $PATH-style list $ac_aux_dir_candidates.
+# If we don't find one directory that contains all the files we need,
+# we report the set of missing files from the *first* directory in
+# $ac_aux_dir_candidates and give up.
+ac_missing_aux_files=""
+ac_first_candidate=:
+printf "%s\n" "$as_me:${as_lineno-$LINENO}: looking for aux files: $ac_aux_files" >&5
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+as_found=false
+for as_dir in $ac_aux_dir_candidates
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+  as_found=:
+
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}:  trying $as_dir" >&5
+  ac_aux_dir_found=yes
+  ac_install_sh=
+  for ac_aux in $ac_aux_files
+  do
+    # As a special case, if "install-sh" is required, that requirement
+    # can be satisfied by any of "install-sh", "install.sh", or "shtool",
+    # and $ac_install_sh is set appropriately for whichever one is found.
+    if test x"$ac_aux" = x"install-sh"
+    then
+      if test -f "${as_dir}install-sh"; then
+        printf "%s\n" "$as_me:${as_lineno-$LINENO}:   ${as_dir}install-sh found" >&5
+        ac_install_sh="${as_dir}install-sh -c"
+      elif test -f "${as_dir}install.sh"; then
+        printf "%s\n" "$as_me:${as_lineno-$LINENO}:   ${as_dir}install.sh found" >&5
+        ac_install_sh="${as_dir}install.sh -c"
+      elif test -f "${as_dir}shtool"; then
+        printf "%s\n" "$as_me:${as_lineno-$LINENO}:   ${as_dir}shtool found" >&5
+        ac_install_sh="${as_dir}shtool install -c"
+      else
+        ac_aux_dir_found=no
+        if $ac_first_candidate; then
+          ac_missing_aux_files="${ac_missing_aux_files} install-sh"
+        else
+          break
+        fi
+      fi
+    else
+      if test -f "${as_dir}${ac_aux}"; then
+        printf "%s\n" "$as_me:${as_lineno-$LINENO}:   ${as_dir}${ac_aux} found" >&5
+      else
+        ac_aux_dir_found=no
+        if $ac_first_candidate; then
+          ac_missing_aux_files="${ac_missing_aux_files} ${ac_aux}"
+        else
+          break
+        fi
+      fi
+    fi
+  done
+  if test "$ac_aux_dir_found" = yes; then
+    ac_aux_dir="$as_dir"
+    break
+  fi
+  ac_first_candidate=false
+
+  as_found=false
+done
+IFS=$as_save_IFS
+if $as_found
+then :
+
+else case e in #(
+  e) as_fn_error $? "cannot find required auxiliary files:$ac_missing_aux_files" "$LINENO" 5 ;;
+esac
+fi
+
+
+# These three variables are undocumented and unsupported,
+# and are intended to be withdrawn in a future Autoconf release.
+# They can cause serious problems if a builder's source tree is in a directory
+# whose full name contains unusual characters.
+if test -f "${ac_aux_dir}config.guess"; then
+  ac_config_guess="$SHELL ${ac_aux_dir}config.guess"
+fi
+if test -f "${ac_aux_dir}config.sub"; then
+  ac_config_sub="$SHELL ${ac_aux_dir}config.sub"
+fi
+if test -f "$ac_aux_dir/configure"; then
+  ac_configure="$SHELL ${ac_aux_dir}configure"
+fi
+
+# Check that the precious variables saved in the cache have kept the same
+# value.
+ac_cache_corrupted=false
+for ac_var in $ac_precious_vars; do
+  eval ac_old_set=\$ac_cv_env_${ac_var}_set
+  eval ac_new_set=\$ac_env_${ac_var}_set
+  eval ac_old_val=\$ac_cv_env_${ac_var}_value
+  eval ac_new_val=\$ac_env_${ac_var}_value
+  case $ac_old_set,$ac_new_set in
+    set,)
+      { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: '$ac_var' was set to '$ac_old_val' in the previous run" >&5
+printf "%s\n" "$as_me: error: '$ac_var' was set to '$ac_old_val' in the previous run" >&2;}
+      ac_cache_corrupted=: ;;
+    ,set)
+      { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: '$ac_var' was not set in the previous run" >&5
+printf "%s\n" "$as_me: error: '$ac_var' was not set in the previous run" >&2;}
+      ac_cache_corrupted=: ;;
+    ,);;
+    *)
+      if test "x$ac_old_val" != "x$ac_new_val"; then
+	# differences in whitespace do not lead to failure.
+	ac_old_val_w=`echo x $ac_old_val`
+	ac_new_val_w=`echo x $ac_new_val`
+	if test "$ac_old_val_w" != "$ac_new_val_w"; then
+	  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: '$ac_var' has changed since the previous run:" >&5
+printf "%s\n" "$as_me: error: '$ac_var' has changed since the previous run:" >&2;}
+	  ac_cache_corrupted=:
+	else
+	  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: warning: ignoring whitespace changes in '$ac_var' since the previous run:" >&5
+printf "%s\n" "$as_me: warning: ignoring whitespace changes in '$ac_var' since the previous run:" >&2;}
+	  eval $ac_var=\$ac_old_val
+	fi
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}:   former value:  '$ac_old_val'" >&5
+printf "%s\n" "$as_me:   former value:  '$ac_old_val'" >&2;}
+	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}:   current value: '$ac_new_val'" >&5
+printf "%s\n" "$as_me:   current value: '$ac_new_val'" >&2;}
+      fi;;
+  esac
+  # Pass precious variables to config.status.
+  if test "$ac_new_set" = set; then
+    case $ac_new_val in
+    *\'*) ac_arg=$ac_var=`printf "%s\n" "$ac_new_val" | sed "s/'/'\\\\\\\\''/g"` ;;
+    *) ac_arg=$ac_var=$ac_new_val ;;
+    esac
+    case " $ac_configure_args " in
+      *" '$ac_arg' "*) ;; # Avoid dups.  Use of quotes ensures accuracy.
+      *) as_fn_append ac_configure_args " '$ac_arg'" ;;
+    esac
+  fi
+done
+if $ac_cache_corrupted; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: changes in the environment can compromise the build" >&5
+printf "%s\n" "$as_me: error: changes in the environment can compromise the build" >&2;}
+  as_fn_error $? "run '${MAKE-make} distclean' and/or 'rm $cache_file'
+	    and start over" "$LINENO" 5
+fi
+## -------------------- ##
+## Main body of script. ##
+## -------------------- ##
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
+ac_includes_default="#ifndef _WIN32
+# define _GNU_SOURCE 1  /* for struct ucred on Linux */
+#endif
+$ac_includes_default
+
+#ifdef _WIN32
+# include <winsock2.h>
+# include <ws2tcpip.h>
+# define IPV6_V6ONLY 27
+#endif
+
+#ifdef HAVE_LIMITS_H
+# include <limits.h>
+#endif
+#ifdef HAVE_STDLIB_H
+# include <stdlib.h>
+#endif
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+#ifdef HAVE_SYS_UIO_H
+# include <sys/uio.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+# include <netinet/in.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
+# include <netinet/tcp.h>
+#endif
+#ifdef HAVE_SYS_UN_H
+# include <sys/un.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#endif
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_NET_IF_H
+# include <net/if.h>
+#endif
+#ifdef HAVE_NETIOAPI_H
+# include <netioapi.h>
+#endif
+"
+
+
+
+ac_config_headers="$ac_config_headers include/HsNetworkConfig.h"
+
+
+
+
+
+  # Make sure we can run config.sub.
+$SHELL "${ac_aux_dir}config.sub" sun4 >/dev/null 2>&1 ||
+  as_fn_error $? "cannot run $SHELL ${ac_aux_dir}config.sub" "$LINENO" 5
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking build system type" >&5
+printf %s "checking build system type... " >&6; }
+if test ${ac_cv_build+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_build_alias=$build_alias
+test "x$ac_build_alias" = x &&
+  ac_build_alias=`$SHELL "${ac_aux_dir}config.guess"`
+test "x$ac_build_alias" = x &&
+  as_fn_error $? "cannot guess build type; you must specify one" "$LINENO" 5
+ac_cv_build=`$SHELL "${ac_aux_dir}config.sub" $ac_build_alias` ||
+  as_fn_error $? "$SHELL ${ac_aux_dir}config.sub $ac_build_alias failed" "$LINENO" 5
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_build" >&5
+printf "%s\n" "$ac_cv_build" >&6; }
+case $ac_cv_build in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical build" "$LINENO" 5;;
+esac
+build=$ac_cv_build
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_build
+shift
+build_cpu=$1
+build_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+build_os=$*
+IFS=$ac_save_IFS
+case $build_os in *\ *) build_os=`echo "$build_os" | sed 's/ /-/g'`;; esac
+
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking host system type" >&5
+printf %s "checking host system type... " >&6; }
+if test ${ac_cv_host+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test "x$host_alias" = x; then
+  ac_cv_host=$ac_cv_build
+else
+  ac_cv_host=`$SHELL "${ac_aux_dir}config.sub" $host_alias` ||
+    as_fn_error $? "$SHELL ${ac_aux_dir}config.sub $host_alias failed" "$LINENO" 5
+fi
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_host" >&5
+printf "%s\n" "$ac_cv_host" >&6; }
+case $ac_cv_host in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical host" "$LINENO" 5;;
+esac
+host=$ac_cv_host
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_host
+shift
+host_cpu=$1
+host_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+host_os=$*
+IFS=$ac_save_IFS
+case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
+
+
+
+
+# Check whether --with-cc was given.
+if test ${with_cc+y}
+then :
+  withval=$with_cc; CC=$withval
+fi
+
+
+
+
+
+
+
+
+
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}gcc; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}gcc"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+printf "%s\n" "$CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_prog_CC"; then
+  ac_ct_CC=$CC
+  # Extract the first word of "gcc", so it can be a program name with args.
+set dummy gcc; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_ac_ct_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="gcc"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+printf "%s\n" "$ac_ct_CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+printf "%s\n" "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+else
+  CC="$ac_cv_prog_CC"
+fi
+
+if test -z "$CC"; then
+          if test -n "$ac_tool_prefix"; then
+    # Extract the first word of "${ac_tool_prefix}cc", so it can be a program name with args.
+set dummy ${ac_tool_prefix}cc; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}cc"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+printf "%s\n" "$CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+  fi
+fi
+if test -z "$CC"; then
+  # Extract the first word of "cc", so it can be a program name with args.
+set dummy cc; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+  ac_prog_rejected=no
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    if test "$as_dir$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then
+       ac_prog_rejected=yes
+       continue
+     fi
+    ac_cv_prog_CC="cc"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+if test $ac_prog_rejected = yes; then
+  # We found a bogon in the path, so make sure we never use it.
+  set dummy $ac_cv_prog_CC
+  shift
+  if test $# != 0; then
+    # We chose a different compiler from the bogus one.
+    # However, it has the same basename, so the bogon will be chosen
+    # first if we set CC to just the basename; use the full file name.
+    shift
+    ac_cv_prog_CC="$as_dir$ac_word${1+' '}$@"
+  fi
+fi
+fi ;;
+esac
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+printf "%s\n" "$CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+fi
+if test -z "$CC"; then
+  if test -n "$ac_tool_prefix"; then
+  for ac_prog in cl.exe
+  do
+    # Extract the first word of "$ac_tool_prefix$ac_prog", so it can be a program name with args.
+set dummy $ac_tool_prefix$ac_prog; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="$ac_tool_prefix$ac_prog"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+printf "%s\n" "$CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+    test -n "$CC" && break
+  done
+fi
+if test -z "$CC"; then
+  ac_ct_CC=$CC
+  for ac_prog in cl.exe
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_ac_ct_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="$ac_prog"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+printf "%s\n" "$ac_ct_CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+  test -n "$ac_ct_CC" && break
+done
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+printf "%s\n" "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+fi
+
+fi
+if test -z "$CC"; then
+  if test -n "$ac_tool_prefix"; then
+  # Extract the first word of "${ac_tool_prefix}clang", so it can be a program name with args.
+set dummy ${ac_tool_prefix}clang; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$CC"; then
+  ac_cv_prog_CC="$CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_CC="${ac_tool_prefix}clang"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+printf "%s\n" "$CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+fi
+if test -z "$ac_cv_prog_CC"; then
+  ac_ct_CC=$CC
+  # Extract the first word of "clang", so it can be a program name with args.
+set dummy clang; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_ac_ct_CC+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) if test -n "$ac_ct_CC"; then
+  ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_ac_ct_CC="clang"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi ;;
+esac
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+printf "%s\n" "$ac_ct_CC" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+printf "%s\n" "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+else
+  CC="$ac_cv_prog_CC"
+fi
+
+fi
+
+
+test -z "$CC" && { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "no acceptable C compiler found in \$PATH
+See 'config.log' for more details" "$LINENO" 5; }
+
+# Provide some information about the compiler.
+printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
+set X $ac_compile
+ac_compiler=$2
+for ac_option in --version -v -V -qversion -version; do
+  { { ac_try="$ac_compiler $ac_option >&5"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_compiler $ac_option >&5") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    sed '10a\
+... rest of stderr output deleted ...
+         10q' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+  fi
+  rm -f conftest.er1 conftest.err
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+done
+
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+ac_clean_files_save=$ac_clean_files
+ac_clean_files="$ac_clean_files a.out a.out.dSYM a.exe b.out"
+# Try to create an executable without -o first, disregard a.out.
+# It will help us diagnose broken compilers, and finding out an intuition
+# of exeext.
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+printf %s "checking whether the C compiler works... " >&6; }
+ac_link_default=`printf "%s\n" "$ac_link" | sed 's/ -o *conftest[^ ]*//'`
+
+# The possible output files:
+ac_files="a.out conftest.exe conftest a.exe a_out.exe b.out conftest.*"
+
+ac_rmfiles=
+for ac_file in $ac_files
+do
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
+    * ) ac_rmfiles="$ac_rmfiles $ac_file";;
+  esac
+done
+rm -f $ac_rmfiles
+
+if { { ac_try="$ac_link_default"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_link_default") 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+then :
+  # Autoconf-2.13 could set the ac_cv_exeext variable to 'no'.
+# So ignore a value of 'no', otherwise this would lead to 'EXEEXT = no'
+# in a Makefile.  We should not override ac_cv_exeext if it was cached,
+# so that the user can short-circuit this test for compilers unknown to
+# Autoconf.
+for ac_file in $ac_files ''
+do
+  test -f "$ac_file" || continue
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj )
+	;;
+    [ab].out )
+	# We found the default executable, but exeext='' is most
+	# certainly right.
+	break;;
+    *.* )
+	if test ${ac_cv_exeext+y} && test "$ac_cv_exeext" != no;
+	then :; else
+	   ac_cv_exeext=`expr "$ac_file" : '[^.]*\(\..*\)'`
+	fi
+	# We set ac_cv_exeext here because the later test for it is not
+	# safe: cross compilers may not add the suffix if given an '-o'
+	# argument, so we may need to know it at that point already.
+	# Even if this section looks crufty: it has the advantage of
+	# actually working.
+	break;;
+    * )
+	break;;
+  esac
+done
+test "$ac_cv_exeext" = no && ac_cv_exeext=
+
+else case e in #(
+  e) ac_file='' ;;
+esac
+fi
+if test -z "$ac_file"
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+printf "%s\n" "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error 77 "C compiler cannot create executables
+See 'config.log' for more details" "$LINENO" 5; }
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+printf "%s\n" "yes" >&6; } ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for C compiler default output file name" >&5
+printf %s "checking for C compiler default output file name... " >&6; }
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_file" >&5
+printf "%s\n" "$ac_file" >&6; }
+ac_exeext=$ac_cv_exeext
+
+rm -f -r a.out a.out.dSYM a.exe conftest$ac_cv_exeext b.out
+ac_clean_files=$ac_clean_files_save
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for suffix of executables" >&5
+printf %s "checking for suffix of executables... " >&6; }
+if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+then :
+  # If both 'conftest.exe' and 'conftest' are 'present' (well, observable)
+# catch 'conftest.exe'.  For instance with Cygwin, 'ls conftest' will
+# work properly (i.e., refer to 'conftest.exe'), while it won't with
+# 'rm'.
+for ac_file in conftest.exe conftest conftest.*; do
+  test -f "$ac_file" || continue
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
+    *.* ) ac_cv_exeext=`expr "$ac_file" : '[^.]*\(\..*\)'`
+	  break;;
+    * ) break;;
+  esac
+done
+else case e in #(
+  e) { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of executables: cannot compile and link
+See 'config.log' for more details" "$LINENO" 5; } ;;
+esac
+fi
+rm -f conftest conftest$ac_cv_exeext
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_exeext" >&5
+printf "%s\n" "$ac_cv_exeext" >&6; }
+
+rm -f conftest.$ac_ext
+EXEEXT=$ac_cv_exeext
+ac_exeext=$EXEEXT
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdio.h>
+int
+main (void)
+{
+FILE *f = fopen ("conftest.out", "w");
+ if (!f)
+  return 1;
+ return ferror (f) || fclose (f) != 0;
+
+  ;
+  return 0;
+}
+_ACEOF
+ac_clean_files="$ac_clean_files conftest.out"
+# Check that the compiler produces executables we can run.  If not, either
+# the compiler is broken, or we cross compile.
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether we are cross compiling" >&5
+printf %s "checking whether we are cross compiling... " >&6; }
+if test "$cross_compiling" != yes; then
+  { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+  if { ac_try='./conftest$ac_cv_exeext'
+  { { case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+    cross_compiling=no
+  else
+    if test "$cross_compiling" = maybe; then
+	cross_compiling=yes
+    else
+	{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error 77 "cannot run C compiled programs.
+If you meant to cross compile, use '--host'.
+See 'config.log' for more details" "$LINENO" 5; }
+    fi
+  fi
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $cross_compiling" >&5
+printf "%s\n" "$cross_compiling" >&6; }
+
+rm -f conftest.$ac_ext conftest$ac_cv_exeext \
+  conftest.o conftest.obj conftest.out
+ac_clean_files=$ac_clean_files_save
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
+printf %s "checking for suffix of object files... " >&6; }
+if test ${ac_cv_objext+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.o conftest.obj
+if { { ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+printf "%s\n" "$ac_try_echo"; } >&5
+  (eval "$ac_compile") 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }
+then :
+  for ac_file in conftest.o conftest.obj conftest.*; do
+  test -f "$ac_file" || continue;
+  case $ac_file in
+    *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM ) ;;
+    *) ac_cv_objext=`expr "$ac_file" : '.*\.\(.*\)'`
+       break;;
+  esac
+done
+else case e in #(
+  e) printf "%s\n" "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of object files: cannot compile
+See 'config.log' for more details" "$LINENO" 5; } ;;
+esac
+fi
+rm -f conftest.$ac_cv_objext conftest.$ac_ext ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_objext" >&5
+printf "%s\n" "$ac_cv_objext" >&6; }
+OBJEXT=$ac_cv_objext
+ac_objext=$OBJEXT
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports GNU C" >&5
+printf %s "checking whether the compiler supports GNU C... " >&6; }
+if test ${ac_cv_c_compiler_gnu+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+#ifndef __GNUC__
+       choke me
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_compiler_gnu=yes
+else case e in #(
+  e) ac_compiler_gnu=no ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+ac_cv_c_compiler_gnu=$ac_compiler_gnu
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_compiler_gnu" >&5
+printf "%s\n" "$ac_cv_c_compiler_gnu" >&6; }
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+if test $ac_compiler_gnu = yes; then
+  GCC=yes
+else
+  GCC=
+fi
+ac_test_CFLAGS=${CFLAGS+y}
+ac_save_CFLAGS=$CFLAGS
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
+printf %s "checking whether $CC accepts -g... " >&6; }
+if test ${ac_cv_prog_cc_g+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_save_c_werror_flag=$ac_c_werror_flag
+   ac_c_werror_flag=yes
+   ac_cv_prog_cc_g=no
+   CFLAGS="-g"
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_prog_cc_g=yes
+else case e in #(
+  e) CFLAGS=""
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+
+else case e in #(
+  e) ac_c_werror_flag=$ac_save_c_werror_flag
+	 CFLAGS="-g"
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_prog_cc_g=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+   ac_c_werror_flag=$ac_save_c_werror_flag ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_g" >&5
+printf "%s\n" "$ac_cv_prog_cc_g" >&6; }
+if test $ac_test_CFLAGS; then
+  CFLAGS=$ac_save_CFLAGS
+elif test $ac_cv_prog_cc_g = yes; then
+  if test "$GCC" = yes; then
+    CFLAGS="-g -O2"
+  else
+    CFLAGS="-g"
+  fi
+else
+  if test "$GCC" = yes; then
+    CFLAGS="-O2"
+  else
+    CFLAGS=
+  fi
+fi
+ac_prog_cc_stdc=no
+if test x$ac_prog_cc_stdc = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C11 features" >&5
+printf %s "checking for $CC option to enable C11 features... " >&6; }
+if test ${ac_cv_prog_cc_c11+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_cv_prog_cc_c11=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$ac_c_conftest_c11_program
+_ACEOF
+for ac_arg in '' -std=gnu11
+do
+  CC="$ac_save_CC $ac_arg"
+  if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_prog_cc_c11=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam
+  test "x$ac_cv_prog_cc_c11" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC ;;
+esac
+fi
+
+if test "x$ac_cv_prog_cc_c11" = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else case e in #(
+  e) if test "x$ac_cv_prog_cc_c11" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c11" >&5
+printf "%s\n" "$ac_cv_prog_cc_c11" >&6; }
+     CC="$CC $ac_cv_prog_cc_c11" ;;
+esac
+fi
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c11
+  ac_prog_cc_stdc=c11 ;;
+esac
+fi
+fi
+if test x$ac_prog_cc_stdc = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C99 features" >&5
+printf %s "checking for $CC option to enable C99 features... " >&6; }
+if test ${ac_cv_prog_cc_c99+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_cv_prog_cc_c99=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$ac_c_conftest_c99_program
+_ACEOF
+for ac_arg in '' -std=gnu99 -std=c99 -c99 -qlanglvl=extc1x -qlanglvl=extc99 -AC99 -D_STDC_C99=
+do
+  CC="$ac_save_CC $ac_arg"
+  if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_prog_cc_c99=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam
+  test "x$ac_cv_prog_cc_c99" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC ;;
+esac
+fi
+
+if test "x$ac_cv_prog_cc_c99" = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else case e in #(
+  e) if test "x$ac_cv_prog_cc_c99" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c99" >&5
+printf "%s\n" "$ac_cv_prog_cc_c99" >&6; }
+     CC="$CC $ac_cv_prog_cc_c99" ;;
+esac
+fi
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c99
+  ac_prog_cc_stdc=c99 ;;
+esac
+fi
+fi
+if test x$ac_prog_cc_stdc = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC option to enable C89 features" >&5
+printf %s "checking for $CC option to enable C89 features... " >&6; }
+if test ${ac_cv_prog_cc_c89+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_cv_prog_cc_c89=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$ac_c_conftest_c89_program
+_ACEOF
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std -Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+do
+  CC="$ac_save_CC $ac_arg"
+  if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_prog_cc_c89=$ac_arg
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam
+  test "x$ac_cv_prog_cc_c89" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC ;;
+esac
+fi
+
+if test "x$ac_cv_prog_cc_c89" = xno
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+printf "%s\n" "unsupported" >&6; }
+else case e in #(
+  e) if test "x$ac_cv_prog_cc_c89" = x
+then :
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+printf "%s\n" "none needed" >&6; }
+else case e in #(
+  e) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+printf "%s\n" "$ac_cv_prog_cc_c89" >&6; }
+     CC="$CC $ac_cv_prog_cc_c89" ;;
+esac
+fi
+  ac_cv_prog_cc_stdc=$ac_cv_prog_cc_c89
+  ac_prog_cc_stdc=c89 ;;
+esac
+fi
+fi
+
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for an ANSI C-conforming const" >&5
+printf %s "checking for an ANSI C-conforming const... " >&6; }
+if test ${ac_cv_c_const+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+
+#ifndef __cplusplus
+  /* Ultrix mips cc rejects this sort of thing.  */
+  typedef int charset[2];
+  const charset cs = { 0, 0 };
+  /* SunOS 4.1.1 cc rejects this.  */
+  char const *const *pcpcc;
+  char **ppc;
+  /* NEC SVR4.0.2 mips cc rejects this.  */
+  struct point {int x, y;};
+  static struct point const zero = {0,0};
+  /* IBM XL C 1.02.0.0 rejects this.
+     It does not let you subtract one const X* pointer from another in
+     an arm of an if-expression whose if-part is not a constant
+     expression */
+  const char *g = "string";
+  pcpcc = &g + (g ? g-g : 0);
+  /* HPUX 7.0 cc rejects these. */
+  ++pcpcc;
+  ppc = (char**) pcpcc;
+  pcpcc = (char const *const *) ppc;
+  { /* SCO 3.2v4 cc rejects this sort of thing.  */
+    char tx;
+    char *t = &tx;
+    char const *s = 0 ? (char *) 0 : (char const *) 0;
+
+    *t++ = 0;
+    if (s) return 0;
+  }
+  { /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
+    int x[] = {25, 17};
+    const int *foo = &x[0];
+    ++foo;
+  }
+  { /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
+    typedef const int *iptr;
+    iptr p = 0;
+    ++p;
+  }
+  { /* IBM XL C 1.02.0.0 rejects this sort of thing, saying
+       "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
+    struct s { int j; const int *ap[3]; } bx;
+    struct s *b = &bx; b->j = 5;
+  }
+  { /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
+    const int foo = 10;
+    if (!foo) return 0;
+  }
+  return !cs[0] && !zero.x;
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  ac_cv_c_const=yes
+else case e in #(
+  e) ac_cv_c_const=no ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_const" >&5
+printf "%s\n" "$ac_cv_c_const" >&6; }
+if test $ac_cv_c_const = no; then
+
+printf "%s\n" "#define const /**/" >>confdefs.h
+
+fi
+
+
+ac_header= ac_cache=
+for ac_item in $ac_header_c_list
+do
+  if test $ac_cache; then
+    ac_fn_c_check_header_compile "$LINENO" $ac_header ac_cv_header_$ac_cache "$ac_includes_default"
+    if eval test \"x\$ac_cv_header_$ac_cache\" = xyes; then
+      printf "%s\n" "#define $ac_item 1" >> confdefs.h
+    fi
+    ac_header= ac_cache=
+  elif test $ac_header; then
+    ac_cache=$ac_item
+  else
+    ac_header=$ac_item
+  fi
+done
+
+
+
+
+
+
+
+
+if test $ac_cv_header_stdlib_h = yes && test $ac_cv_header_string_h = yes
+then :
+
+printf "%s\n" "#define STDC_HEADERS 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "limits.h" "ac_cv_header_limits_h" "$ac_includes_default"
+if test "x$ac_cv_header_limits_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_LIMITS_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "stdlib.h" "ac_cv_header_stdlib_h" "$ac_includes_default"
+if test "x$ac_cv_header_stdlib_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_STDLIB_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "unistd.h" "ac_cv_header_unistd_h" "$ac_includes_default"
+if test "x$ac_cv_header_unistd_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_UNISTD_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "sys/types.h" "ac_cv_header_sys_types_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_types_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYS_TYPES_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "fcntl.h" "ac_cv_header_fcntl_h" "$ac_includes_default"
+if test "x$ac_cv_header_fcntl_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_FCNTL_H 1" >>confdefs.h
+
+fi
+
+ac_fn_c_check_header_compile "$LINENO" "sys/uio.h" "ac_cv_header_sys_uio_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_uio_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYS_UIO_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "sys/socket.h" "ac_cv_header_sys_socket_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_socket_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYS_SOCKET_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "netinet/in.h" "ac_cv_header_netinet_in_h" "$ac_includes_default"
+if test "x$ac_cv_header_netinet_in_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_NETINET_IN_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "netinet/tcp.h" "ac_cv_header_netinet_tcp_h" "$ac_includes_default"
+if test "x$ac_cv_header_netinet_tcp_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_NETINET_TCP_H 1" >>confdefs.h
+
+fi
+
+ac_fn_c_check_header_compile "$LINENO" "sys/un.h" "ac_cv_header_sys_un_h" "$ac_includes_default"
+if test "x$ac_cv_header_sys_un_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_SYS_UN_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "arpa/inet.h" "ac_cv_header_arpa_inet_h" "$ac_includes_default"
+if test "x$ac_cv_header_arpa_inet_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_ARPA_INET_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "netdb.h" "ac_cv_header_netdb_h" "$ac_includes_default"
+if test "x$ac_cv_header_netdb_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_NETDB_H 1" >>confdefs.h
+
+fi
+
+ac_fn_c_check_header_compile "$LINENO" "net/if.h" "ac_cv_header_net_if_h" "$ac_includes_default"
+if test "x$ac_cv_header_net_if_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_NET_IF_H 1" >>confdefs.h
+
+fi
+ac_fn_c_check_header_compile "$LINENO" "netioapi.h" "ac_cv_header_netioapi_h" "$ac_includes_default"
+if test "x$ac_cv_header_netioapi_h" = xyes
+then :
+  printf "%s\n" "#define HAVE_NETIOAPI_H 1" >>confdefs.h
+
+fi
+
+
+ac_fn_c_check_type "$LINENO" "struct ucred" "ac_cv_type_struct_ucred" "$ac_includes_default"
+if test "x$ac_cv_type_struct_ucred" = xyes
+then :
+
+printf "%s\n" "#define HAVE_STRUCT_UCRED 1" >>confdefs.h
+
+
+fi
+
+
+ac_fn_c_check_func "$LINENO" "gai_strerror" "ac_cv_func_gai_strerror"
+if test "x$ac_cv_func_gai_strerror" = xyes
+then :
+  printf "%s\n" "#define HAVE_GAI_STRERROR 1" >>confdefs.h
+
+fi
+ac_fn_c_check_func "$LINENO" "gethostent" "ac_cv_func_gethostent"
+if test "x$ac_cv_func_gethostent" = xyes
+then :
+  printf "%s\n" "#define HAVE_GETHOSTENT 1" >>confdefs.h
+
+fi
+ac_fn_c_check_func "$LINENO" "accept4" "ac_cv_func_accept4"
+if test "x$ac_cv_func_accept4" = xyes
+then :
+  printf "%s\n" "#define HAVE_ACCEPT4 1" >>confdefs.h
+
+fi
+
+ac_fn_c_check_func "$LINENO" "getpeereid" "ac_cv_func_getpeereid"
+if test "x$ac_cv_func_getpeereid" = xyes
+then :
+  printf "%s\n" "#define HAVE_GETPEEREID 1" >>confdefs.h
+
+fi
+
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5
+printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; }
+if test ${ac_cv_c_undeclared_builtin_options+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) ac_save_CFLAGS=$CFLAGS
+   ac_cv_c_undeclared_builtin_options='cannot detect'
+   for ac_arg in '' -fno-builtin; do
+     CFLAGS="$ac_save_CFLAGS $ac_arg"
+     # This test program should *not* compile successfully.
+     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main (void)
+{
+(void) strchr;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+
+else case e in #(
+  e) # This test program should compile successfully.
+        # No library function is consistently available on
+        # freestanding implementations, so test against a dummy
+        # declaration.  Include always-available headers on the
+        # off chance that they somehow elicit warnings.
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <float.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <stddef.h>
+extern void ac_decl (int, char *);
+
+int
+main (void)
+{
+(void) ac_decl (0, (char *) 0);
+  (void) ac_decl;
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"
+then :
+  if test x"$ac_arg" = x
+then :
+  ac_cv_c_undeclared_builtin_options='none needed'
+else case e in #(
+  e) ac_cv_c_undeclared_builtin_options=$ac_arg ;;
+esac
+fi
+          break
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
+    done
+    CFLAGS=$ac_save_CFLAGS
+   ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_undeclared_builtin_options" >&5
+printf "%s\n" "$ac_cv_c_undeclared_builtin_options" >&6; }
+  case $ac_cv_c_undeclared_builtin_options in #(
+  'cannot detect') :
+    { { printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: in '$ac_pwd':" >&5
+printf "%s\n" "$as_me: error: in '$ac_pwd':" >&2;}
+as_fn_error $? "cannot make $CC report undeclared builtins
+See 'config.log' for more details" "$LINENO" 5; } ;; #(
+  'none needed') :
+    ac_c_undeclared_builtin_options='' ;; #(
+  *) :
+    ac_c_undeclared_builtin_options=$ac_cv_c_undeclared_builtin_options ;;
+esac
+
+ac_fn_check_decl "$LINENO" "AI_ADDRCONFIG" "ac_cv_have_decl_AI_ADDRCONFIG" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_AI_ADDRCONFIG" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_AI_ADDRCONFIG $ac_have_decl" >>confdefs.h
+ac_fn_check_decl "$LINENO" "AI_ALL" "ac_cv_have_decl_AI_ALL" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_AI_ALL" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_AI_ALL $ac_have_decl" >>confdefs.h
+ac_fn_check_decl "$LINENO" "AI_NUMERICSERV" "ac_cv_have_decl_AI_NUMERICSERV" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_AI_NUMERICSERV" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_AI_NUMERICSERV $ac_have_decl" >>confdefs.h
+ac_fn_check_decl "$LINENO" "AI_V4MAPPED" "ac_cv_have_decl_AI_V4MAPPED" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_AI_V4MAPPED" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_AI_V4MAPPED $ac_have_decl" >>confdefs.h
+
+ac_fn_check_decl "$LINENO" "IPV6_V6ONLY" "ac_cv_have_decl_IPV6_V6ONLY" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IPV6_V6ONLY" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IPV6_V6ONLY $ac_have_decl" >>confdefs.h
+
+ac_fn_check_decl "$LINENO" "IPPROTO_IP" "ac_cv_have_decl_IPPROTO_IP" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IPPROTO_IP" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IPPROTO_IP $ac_have_decl" >>confdefs.h
+ac_fn_check_decl "$LINENO" "IPPROTO_TCP" "ac_cv_have_decl_IPPROTO_TCP" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IPPROTO_TCP" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IPPROTO_TCP $ac_have_decl" >>confdefs.h
+ac_fn_check_decl "$LINENO" "IPPROTO_IPV6" "ac_cv_have_decl_IPPROTO_IPV6" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IPPROTO_IPV6" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IPPROTO_IPV6 $ac_have_decl" >>confdefs.h
+
+ac_fn_check_decl "$LINENO" "SO_PEERCRED" "ac_cv_have_decl_SO_PEERCRED" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_SO_PEERCRED" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_SO_PEERCRED $ac_have_decl" >>confdefs.h
+
+ac_fn_check_decl "$LINENO" "IP_DONTFRAG" "ac_cv_have_decl_IP_DONTFRAG" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IP_DONTFRAG" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IP_DONTFRAG $ac_have_decl" >>confdefs.h
+
+ac_fn_check_decl "$LINENO" "IP_MTU_DISCOVER" "ac_cv_have_decl_IP_MTU_DISCOVER" "$ac_includes_default" "$ac_c_undeclared_builtin_options" "CFLAGS"
+if test "x$ac_cv_have_decl_IP_MTU_DISCOVER" = xyes
+then :
+  ac_have_decl=1
+else case e in #(
+  e) ac_have_decl=0 ;;
+esac
+fi
+printf "%s\n" "#define HAVE_DECL_IP_MTU_DISCOVER $ac_have_decl" >>confdefs.h
+
+
+ac_fn_c_check_member "$LINENO" "struct msghdr" "msg_control" "ac_cv_member_struct_msghdr_msg_control" "$ac_includes_default"
+if test "x$ac_cv_member_struct_msghdr_msg_control" = xyes
+then :
+
+printf "%s\n" "#define HAVE_STRUCT_MSGHDR_MSG_CONTROL 1" >>confdefs.h
+
+
+fi
+ac_fn_c_check_member "$LINENO" "struct msghdr" "msg_accrights" "ac_cv_member_struct_msghdr_msg_accrights" "$ac_includes_default"
+if test "x$ac_cv_member_struct_msghdr_msg_accrights" = xyes
+then :
+
+printf "%s\n" "#define HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS 1" >>confdefs.h
+
+
+fi
+
+ac_fn_c_check_member "$LINENO" "struct sockaddr" "sa_len" "ac_cv_member_struct_sockaddr_sa_len" "$ac_includes_default"
+if test "x$ac_cv_member_struct_sockaddr_sa_len" = xyes
+then :
+
+printf "%s\n" "#define HAVE_STRUCT_SOCKADDR_SA_LEN 1" >>confdefs.h
+
+
+fi
+
+
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: creating ./network.buildinfo" >&5
+printf "%s\n" "$as_me: creating ./network.buildinfo" >&6;}
+echo "install-includes: HsNetworkConfig.h" > network.buildinfo
+
+cat >confcache <<\_ACEOF
+# This file is a shell script that caches the results of configure
+# tests run on this system so they can be shared between configure
+# scripts and configure runs, see configure's option --config-cache.
+# It is not useful on other systems.  If it contains results you don't
+# want to keep, you may remove or edit it.
+#
+# config.status only pays attention to the cache file if you give it
+# the --recheck option to rerun configure.
+#
+# 'ac_cv_env_foo' variables (set or unset) will be overridden when
+# loading this file, other *unset* 'ac_cv_foo' will be assigned the
+# following values.
+
+_ACEOF
+
+# The following way of writing the cache mishandles newlines in values,
+# but we know of no workaround that is simple, portable, and efficient.
+# So, we kill variables containing newlines.
+# Ultrix sh set writes to stderr and can't be redirected directly,
+# and sets the high bit in the cache file unless we assign to the vars.
+(
+  for ac_var in `(set) 2>&1 | sed -n 's/^\([a-zA-Z_][a-zA-Z0-9_]*\)=.*/\1/p'`; do
+    eval ac_val=\$$ac_var
+    case $ac_val in #(
+    *${as_nl}*)
+      case $ac_var in #(
+      *_cv_*) { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+printf "%s\n" "$as_me: WARNING: cache variable $ac_var contains a newline" >&2;} ;;
+      esac
+      case $ac_var in #(
+      _ | IFS | as_nl) ;; #(
+      BASH_ARGV | BASH_SOURCE) eval $ac_var= ;; #(
+      *) { eval $ac_var=; unset $ac_var;} ;;
+      esac ;;
+    esac
+  done
+
+  (set) 2>&1 |
+    case $as_nl`(ac_space=' '; set) 2>&1` in #(
+    *${as_nl}ac_space=\ *)
+      # 'set' does not quote correctly, so add quotes: double-quote
+      # substitution turns \\\\ into \\, and sed turns \\ into \.
+      sed -n \
+	"s/'/'\\\\''/g;
+	  s/^\\([_$as_cr_alnum]*_cv_[_$as_cr_alnum]*\\)=\\(.*\\)/\\1='\\2'/p"
+      ;; #(
+    *)
+      # 'set' quotes correctly as required by POSIX, so do not add quotes.
+      sed -n "/^[_$as_cr_alnum]*_cv_[_$as_cr_alnum]*=/p"
+      ;;
+    esac |
+    sort
+) |
+  sed '
+     /^ac_cv_env_/b end
+     t clear
+     :clear
+     s/^\([^=]*\)=\(.*[{}].*\)$/test ${\1+y} || &/
+     t end
+     s/^\([^=]*\)=\(.*\)$/\1=${\1=\2}/
+     :end' >>confcache
+if diff "$cache_file" confcache >/dev/null 2>&1; then :; else
+  if test -w "$cache_file"; then
+    if test "x$cache_file" != "x/dev/null"; then
+      { printf "%s\n" "$as_me:${as_lineno-$LINENO}: updating cache $cache_file" >&5
+printf "%s\n" "$as_me: updating cache $cache_file" >&6;}
+      if test ! -f "$cache_file" || test -h "$cache_file"; then
+	cat confcache >"$cache_file"
+      else
+        case $cache_file in #(
+        */* | ?:*)
+	  mv -f confcache "$cache_file"$$ &&
+	  mv -f "$cache_file"$$ "$cache_file" ;; #(
+        *)
+	  mv -f confcache "$cache_file" ;;
+	esac
+      fi
+    fi
+  else
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: not updating unwritable cache $cache_file" >&5
+printf "%s\n" "$as_me: not updating unwritable cache $cache_file" >&6;}
+  fi
+fi
+rm -f confcache
+
+test "x$prefix" = xNONE && prefix=$ac_default_prefix
+# Let make expand exec_prefix.
+test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
+
+DEFS=-DHAVE_CONFIG_H
+
+ac_libobjs=
+ac_ltlibobjs=
+U=
+for ac_i in : $LIBOBJS; do test "x$ac_i" = x: && continue
+  # 1. Remove the extension, and $U if already installed.
+  ac_script='s/\$U\././;s/\.o$//;s/\.obj$//'
+  ac_i=`printf "%s\n" "$ac_i" | sed "$ac_script"`
+  # 2. Prepend LIBOBJDIR.  When used with automake>=1.10 LIBOBJDIR
+  #    will be set to the directory where LIBOBJS objects are built.
+  as_fn_append ac_libobjs " \${LIBOBJDIR}$ac_i\$U.$ac_objext"
+  as_fn_append ac_ltlibobjs " \${LIBOBJDIR}$ac_i"'$U.lo'
+done
+LIBOBJS=$ac_libobjs
+
+LTLIBOBJS=$ac_ltlibobjs
+
+
+
+: "${CONFIG_STATUS=./config.status}"
+ac_write_fail=0
+ac_clean_files_save=$ac_clean_files
+ac_clean_files="$ac_clean_files $CONFIG_STATUS"
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: creating $CONFIG_STATUS" >&5
+printf "%s\n" "$as_me: creating $CONFIG_STATUS" >&6;}
+as_write_fail=0
+cat >$CONFIG_STATUS <<_ASEOF || as_write_fail=1
+#! $SHELL
+# Generated by $as_me.
+# Run this file to recreate the current configuration.
+# Compiler output produced by configure, useful for debugging
+# configure, is in config.log if it exists.
+
+debug=false
+ac_cs_recheck=false
+ac_cs_silent=false
+
+SHELL=\${CONFIG_SHELL-$SHELL}
+export SHELL
+_ASEOF
+cat >>$CONFIG_STATUS <<\_ASEOF || as_write_fail=1
+## -------------------- ##
+## M4sh Initialization. ##
+## -------------------- ##
+
+# Be more Bourne compatible
+DUALCASE=1; export DUALCASE # for MKS sh
+if test ${ZSH_VERSION+y} && (emulate sh) >/dev/null 2>&1
+then :
+  emulate sh
+  NULLCMD=:
+  # Pre-4.2 versions of Zsh do word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else case e in #(
+  e) case `(set -o) 2>/dev/null` in #(
+  *posix*) :
+    set -o posix ;; #(
+  *) :
+     ;;
+esac ;;
+esac
+fi
+
+
+
+# Reset variables that may have inherited troublesome values from
+# the environment.
+
+# IFS needs to be set, to space, tab, and newline, in precisely that order.
+# (If _AS_PATH_WALK were called with IFS unset, it would have the
+# side effect of setting IFS to empty, thus disabling word splitting.)
+# Quoting is to prevent editors from complaining about space-tab.
+as_nl='
+'
+export as_nl
+IFS=" ""	$as_nl"
+
+PS1='$ '
+PS2='> '
+PS4='+ '
+
+# Ensure predictable behavior from utilities with locale-dependent output.
+LC_ALL=C
+export LC_ALL
+LANGUAGE=C
+export LANGUAGE
+
+# We cannot yet rely on "unset" to work, but we need these variables
+# to be unset--not just set to an empty or harmless value--now, to
+# avoid bugs in old shells (e.g. pre-3.0 UWIN ksh).  This construct
+# also avoids known problems related to "unset" and subshell syntax
+# in other old shells (e.g. bash 2.01 and pdksh 5.2.14).
+for as_var in BASH_ENV ENV MAIL MAILPATH CDPATH
+do eval test \${$as_var+y} \
+  && ( (unset $as_var) || exit 1) >/dev/null 2>&1 && unset $as_var || :
+done
+
+# Ensure that fds 0, 1, and 2 are open.
+if (exec 3>&0) 2>/dev/null; then :; else exec 0</dev/null; fi
+if (exec 3>&1) 2>/dev/null; then :; else exec 1>/dev/null; fi
+if (exec 3>&2)            ; then :; else exec 2>/dev/null; fi
+
+# The user is always right.
+if ${PATH_SEPARATOR+false} :; then
+  PATH_SEPARATOR=:
+  (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 && {
+    (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 ||
+      PATH_SEPARATOR=';'
+  }
+fi
+
+
+# Find who we are.  Look in the path if we contain no directory separator.
+as_myself=
+case $0 in #((
+  *[\\/]* ) as_myself=$0 ;;
+  *) as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    test -r "$as_dir$0" && as_myself=$as_dir$0 && break
+  done
+IFS=$as_save_IFS
+
+     ;;
+esac
+# We did not find ourselves, most probably we were run as 'sh COMMAND'
+# in which case we are not to be found in the path.
+if test "x$as_myself" = x; then
+  as_myself=$0
+fi
+if test ! -f "$as_myself"; then
+  printf "%s\n" "$as_myself: error: cannot find myself; rerun with an absolute file name" >&2
+  exit 1
+fi
+
+
+
+# as_fn_error STATUS ERROR [LINENO LOG_FD]
+# ----------------------------------------
+# Output "`basename $0`: error: ERROR" to stderr. If LINENO and LOG_FD are
+# provided, also output the error to LOG_FD, referencing LINENO. Then exit the
+# script with STATUS, using 1 if that was 0.
+as_fn_error ()
+{
+  as_status=$1; test $as_status -eq 0 && as_status=1
+  if test "$4"; then
+    as_lineno=${as_lineno-"$3"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: error: $2" >&$4
+  fi
+  printf "%s\n" "$as_me: error: $2" >&2
+  as_fn_exit $as_status
+} # as_fn_error
+
+
+# as_fn_set_status STATUS
+# -----------------------
+# Set $? to STATUS, without forking.
+as_fn_set_status ()
+{
+  return $1
+} # as_fn_set_status
+
+# as_fn_exit STATUS
+# -----------------
+# Exit the shell with STATUS, even in a "trap 0" or "set -e" context.
+as_fn_exit ()
+{
+  set +e
+  as_fn_set_status $1
+  exit $1
+} # as_fn_exit
+
+# as_fn_unset VAR
+# ---------------
+# Portably unset VAR.
+as_fn_unset ()
+{
+  { eval $1=; unset $1;}
+}
+as_unset=as_fn_unset
+
+# as_fn_append VAR VALUE
+# ----------------------
+# Append the text in VALUE to the end of the definition contained in VAR. Take
+# advantage of any shell optimizations that allow amortized linear growth over
+# repeated appends, instead of the typical quadratic growth present in naive
+# implementations.
+if (eval "as_var=1; as_var+=2; test x\$as_var = x12") 2>/dev/null
+then :
+  eval 'as_fn_append ()
+  {
+    eval $1+=\$2
+  }'
+else case e in #(
+  e) as_fn_append ()
+  {
+    eval $1=\$$1\$2
+  } ;;
+esac
+fi # as_fn_append
+
+# as_fn_arith ARG...
+# ------------------
+# Perform arithmetic evaluation on the ARGs, and store the result in the
+# global $as_val. Take advantage of shells that can avoid forks. The arguments
+# must be portable across $(()) and expr.
+if (eval "test \$(( 1 + 1 )) = 2") 2>/dev/null
+then :
+  eval 'as_fn_arith ()
+  {
+    as_val=$(( $* ))
+  }'
+else case e in #(
+  e) as_fn_arith ()
+  {
+    as_val=`expr "$@" || test $? -eq 1`
+  } ;;
+esac
+fi # as_fn_arith
+
+
+if expr a : '\(a\)' >/dev/null 2>&1 &&
+   test "X`expr 00001 : '.*\(...\)'`" = X001; then
+  as_expr=expr
+else
+  as_expr=false
+fi
+
+if (basename -- /) >/dev/null 2>&1 && test "X`basename -- / 2>&1`" = "X/"; then
+  as_basename=basename
+else
+  as_basename=false
+fi
+
+if (as_dir=`dirname -- /` && test "X$as_dir" = X/) >/dev/null 2>&1; then
+  as_dirname=dirname
+else
+  as_dirname=false
+fi
+
+as_me=`$as_basename -- "$0" ||
+$as_expr X/"$0" : '.*/\([^/][^/]*\)/*$' \| \
+	 X"$0" : 'X\(//\)$' \| \
+	 X"$0" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X/"$0" |
+    sed '/^.*\/\([^/][^/]*\)\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\/\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+
+# Avoid depending upon Character Ranges.
+as_cr_letters='abcdefghijklmnopqrstuvwxyz'
+as_cr_LETTERS='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+as_cr_Letters=$as_cr_letters$as_cr_LETTERS
+as_cr_digits='0123456789'
+as_cr_alnum=$as_cr_Letters$as_cr_digits
+
+
+# Determine whether it's possible to make 'echo' print without a newline.
+# These variables are no longer used directly by Autoconf, but are AC_SUBSTed
+# for compatibility with existing Makefiles.
+ECHO_C= ECHO_N= ECHO_T=
+case `echo -n x` in #(((((
+-n*)
+  case `echo 'xy\c'` in
+  *c*) ECHO_T='	';;	# ECHO_T is single tab character.
+  xy)  ECHO_C='\c';;
+  *)   echo `echo ksh88 bug on AIX 6.1` > /dev/null
+       ECHO_T='	';;
+  esac;;
+*)
+  ECHO_N='-n';;
+esac
+
+# For backward compatibility with old third-party macros, we provide
+# the shell variables $as_echo and $as_echo_n.  New code should use
+# AS_ECHO(["message"]) and AS_ECHO_N(["message"]), respectively.
+as_echo='printf %s\n'
+as_echo_n='printf %s'
+
+rm -f conf$$ conf$$.exe conf$$.file
+if test -d conf$$.dir; then
+  rm -f conf$$.dir/conf$$.file
+else
+  rm -f conf$$.dir
+  mkdir conf$$.dir 2>/dev/null
+fi
+if (echo >conf$$.file) 2>/dev/null; then
+  if ln -s conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s='ln -s'
+    # ... but there are two gotchas:
+    # 1) On MSYS, both 'ln -s file dir' and 'ln file dir' fail.
+    # 2) DJGPP < 2.04 has no symlinks; 'ln -s' creates a wrapper executable.
+    # In both cases, we have to default to 'cp -pR'.
+    ln -s conf$$.file conf$$.dir 2>/dev/null && test ! -f conf$$.exe ||
+      as_ln_s='cp -pR'
+  elif ln conf$$.file conf$$ 2>/dev/null; then
+    as_ln_s=ln
+  else
+    as_ln_s='cp -pR'
+  fi
+else
+  as_ln_s='cp -pR'
+fi
+rm -f conf$$ conf$$.exe conf$$.dir/conf$$.file conf$$.file
+rmdir conf$$.dir 2>/dev/null
+
+
+# as_fn_mkdir_p
+# -------------
+# Create "$as_dir" as a directory, including parents if necessary.
+as_fn_mkdir_p ()
+{
+
+  case $as_dir in #(
+  -*) as_dir=./$as_dir;;
+  esac
+  test -d "$as_dir" || eval $as_mkdir_p || {
+    as_dirs=
+    while :; do
+      case $as_dir in #(
+      *\'*) as_qdir=`printf "%s\n" "$as_dir" | sed "s/'/'\\\\\\\\''/g"`;; #'(
+      *) as_qdir=$as_dir;;
+      esac
+      as_dirs="'$as_qdir' $as_dirs"
+      as_dir=`$as_dirname -- "$as_dir" ||
+$as_expr X"$as_dir" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$as_dir" : 'X\(//\)[^/]' \| \
+	 X"$as_dir" : 'X\(//\)$' \| \
+	 X"$as_dir" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X"$as_dir" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+      test -d "$as_dir" && break
+    done
+    test -z "$as_dirs" || eval "mkdir $as_dirs"
+  } || test -d "$as_dir" || as_fn_error $? "cannot create directory $as_dir"
+
+
+} # as_fn_mkdir_p
+if mkdir -p . 2>/dev/null; then
+  as_mkdir_p='mkdir -p "$as_dir"'
+else
+  test -d ./-p && rmdir ./-p
+  as_mkdir_p=false
+fi
+
+
+# as_fn_executable_p FILE
+# -----------------------
+# Test if FILE is an executable regular file.
+as_fn_executable_p ()
+{
+  test -f "$1" && test -x "$1"
+} # as_fn_executable_p
+as_test_x='test -x'
+as_executable_p=as_fn_executable_p
+
+# Sed expression to map a string onto a valid CPP name.
+as_sed_cpp="y%*$as_cr_letters%P$as_cr_LETTERS%;s%[^_$as_cr_alnum]%_%g"
+as_tr_cpp="eval sed '$as_sed_cpp'" # deprecated
+
+# Sed expression to map a string onto a valid variable name.
+as_sed_sh="y%*+%pp%;s%[^_$as_cr_alnum]%_%g"
+as_tr_sh="eval sed '$as_sed_sh'" # deprecated
+
+
+exec 6>&1
+## ----------------------------------- ##
+## Main body of $CONFIG_STATUS script. ##
+## ----------------------------------- ##
+_ASEOF
+test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+# Save the log message, to keep $0 and so on meaningful, and to
+# report actual input values of CONFIG_FILES etc. instead of their
+# values after options handling.
+ac_log="
+This file was extended by Haskell network package $as_me 3.2.7.0, which was
+generated by GNU Autoconf 2.72.  Invocation command line was
+
+  CONFIG_FILES    = $CONFIG_FILES
+  CONFIG_HEADERS  = $CONFIG_HEADERS
+  CONFIG_LINKS    = $CONFIG_LINKS
+  CONFIG_COMMANDS = $CONFIG_COMMANDS
+  $ $0 $@
+
+on `(hostname || uname -n) 2>/dev/null | sed 1q`
+"
+
+_ACEOF
+
+
+case $ac_config_headers in *"
+"*) set x $ac_config_headers; shift; ac_config_headers=$*;;
+esac
+
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+# Files that config.status was made for.
+config_headers="$ac_config_headers"
+
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+ac_cs_usage="\
+'$as_me' instantiates files and other configuration actions
+from templates according to the current configuration.  Unless the files
+and actions are specified as TAGs, all are instantiated by default.
+
+Usage: $0 [OPTION]... [TAG]...
+
+  -h, --help       print this help, then exit
+  -V, --version    print version number and configuration settings, then exit
+      --config     print configuration, then exit
+  -q, --quiet, --silent
+                   do not print progress messages
+  -d, --debug      don't remove temporary files
+      --recheck    update $as_me by reconfiguring in the same conditions
+      --header=FILE[:TEMPLATE]
+                   instantiate the configuration header FILE
+
+Configuration headers:
+$config_headers
+
+Report bugs to <libraries@haskell.org>."
+
+_ACEOF
+ac_cs_config=`printf "%s\n" "$ac_configure_args" | sed "$ac_safe_unquote"`
+ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\''/g"`
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+ac_cs_config='$ac_cs_config_escaped'
+ac_cs_version="\\
+Haskell network package config.status 3.2.7.0
+configured by $0, generated by GNU Autoconf 2.72,
+  with options \\"\$ac_cs_config\\"
+
+Copyright (C) 2023 Free Software Foundation, Inc.
+This config.status script is free software; the Free Software Foundation
+gives unlimited permission to copy, distribute and modify it."
+
+ac_pwd='$ac_pwd'
+srcdir='$srcdir'
+test -n "\$AWK" || AWK=awk
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+# The default lists apply if the user does not specify any file.
+ac_need_defaults=:
+while test $# != 0
+do
+  case $1 in
+  --*=?*)
+    ac_option=`expr "X$1" : 'X\([^=]*\)='`
+    ac_optarg=`expr "X$1" : 'X[^=]*=\(.*\)'`
+    ac_shift=:
+    ;;
+  --*=)
+    ac_option=`expr "X$1" : 'X\([^=]*\)='`
+    ac_optarg=
+    ac_shift=:
+    ;;
+  *)
+    ac_option=$1
+    ac_optarg=$2
+    ac_shift=shift
+    ;;
+  esac
+
+  case $ac_option in
+  # Handling of the options.
+  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
+    ac_cs_recheck=: ;;
+  --version | --versio | --versi | --vers | --ver | --ve | --v | -V )
+    printf "%s\n" "$ac_cs_version"; exit ;;
+  --config | --confi | --conf | --con | --co | --c )
+    printf "%s\n" "$ac_cs_config"; exit ;;
+  --debug | --debu | --deb | --de | --d | -d )
+    debug=: ;;
+  --header | --heade | --head | --hea )
+    $ac_shift
+    case $ac_optarg in
+    *\'*) ac_optarg=`printf "%s\n" "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"` ;;
+    esac
+    as_fn_append CONFIG_HEADERS " '$ac_optarg'"
+    ac_need_defaults=false;;
+  --he | --h)
+    # Conflict between --help and --header
+    as_fn_error $? "ambiguous option: '$1'
+Try '$0 --help' for more information.";;
+  --help | --hel | -h )
+    printf "%s\n" "$ac_cs_usage"; exit ;;
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil | --si | --s)
+    ac_cs_silent=: ;;
+
+  # This is an error.
+  -*) as_fn_error $? "unrecognized option: '$1'
+Try '$0 --help' for more information." ;;
+
+  *) as_fn_append ac_config_targets " $1"
+     ac_need_defaults=false ;;
+
+  esac
+  shift
+done
+
+ac_configure_extra_args=
+
+if $ac_cs_silent; then
+  exec 6>/dev/null
+  ac_configure_extra_args="$ac_configure_extra_args --silent"
+fi
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+if \$ac_cs_recheck; then
+  set X $SHELL '$0' $ac_configure_args \$ac_configure_extra_args --no-create --no-recursion
+  shift
+  \printf "%s\n" "running CONFIG_SHELL=$SHELL \$*" >&6
+  CONFIG_SHELL='$SHELL'
+  export CONFIG_SHELL
+  exec "\$@"
+fi
+
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+exec 5>>config.log
+{
+  echo
+  sed 'h;s/./-/g;s/^.../## /;s/...$/ ##/;p;x;p;x' <<_ASBOX
+## Running $as_me. ##
+_ASBOX
+  printf "%s\n" "$ac_log"
+} >&5
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+_ACEOF
+
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+
+# Handling of arguments.
+for ac_config_target in $ac_config_targets
+do
+  case $ac_config_target in
+    "include/HsNetworkConfig.h") CONFIG_HEADERS="$CONFIG_HEADERS include/HsNetworkConfig.h" ;;
+
+  *) as_fn_error $? "invalid argument: '$ac_config_target'" "$LINENO" 5;;
+  esac
+done
+
+
+# If the user did not use the arguments to specify the items to instantiate,
+# then the envvar interface is used.  Set only those that are not.
+# We use the long form for the default assignment because of an extremely
+# bizarre bug on SunOS 4.1.3.
+if $ac_need_defaults; then
+  test ${CONFIG_HEADERS+y} || CONFIG_HEADERS=$config_headers
+fi
+
+# Have a temporary directory for convenience.  Make it in the build tree
+# simply because there is no reason against having it here, and in addition,
+# creating and moving files from /tmp can sometimes cause problems.
+# Hook for its removal unless debugging.
+# Note that there is a small window in which the directory will not be cleaned:
+# after its creation but before its name has been assigned to '$tmp'.
+$debug ||
+{
+  tmp= ac_tmp=
+  trap 'exit_status=$?
+  : "${ac_tmp:=$tmp}"
+  { test ! -d "$ac_tmp" || rm -fr "$ac_tmp"; } && exit $exit_status
+' 0
+  trap 'as_fn_exit 1' 1 2 13 15
+}
+# Create a (secure) tmp directory for tmp files.
+
+{
+  tmp=`(umask 077 && mktemp -d "./confXXXXXX") 2>/dev/null` &&
+  test -d "$tmp"
+}  ||
+{
+  tmp=./conf$$-$RANDOM
+  (umask 077 && mkdir "$tmp")
+} || as_fn_error $? "cannot create a temporary directory in ." "$LINENO" 5
+ac_tmp=$tmp
+
+# Set up the scripts for CONFIG_HEADERS section.
+# No need to generate them if there are no CONFIG_HEADERS.
+# This happens for instance with './config.status Makefile'.
+if test -n "$CONFIG_HEADERS"; then
+cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
+BEGIN {
+_ACEOF
+
+# Transform confdefs.h into an awk script 'defines.awk', embedded as
+# here-document in config.status, that substitutes the proper values into
+# config.h.in to produce config.h.
+
+# Create a delimiter string that does not exist in confdefs.h, to ease
+# handling of long lines.
+ac_delim='%!_!# '
+for ac_last_try in false false :; do
+  ac_tt=`sed -n "/$ac_delim/p" confdefs.h`
+  if test -z "$ac_tt"; then
+    break
+  elif $ac_last_try; then
+    as_fn_error $? "could not make $CONFIG_HEADERS" "$LINENO" 5
+  else
+    ac_delim="$ac_delim!$ac_delim _$ac_delim!! "
+  fi
+done
+
+# For the awk script, D is an array of macro values keyed by name,
+# likewise P contains macro parameters if any.  Preserve backslash
+# newline sequences.
+
+ac_word_re=[_$as_cr_Letters][_$as_cr_alnum]*
+sed -n '
+s/.\{148\}/&'"$ac_delim"'/g
+t rset
+:rset
+s/^[	 ]*#[	 ]*define[	 ][	 ]*/ /
+t def
+d
+:def
+s/\\$//
+t bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3"/p
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2"/p
+d
+:bsnl
+s/["\\]/\\&/g
+s/^ \('"$ac_word_re"'\)\(([^()]*)\)[	 ]*\(.*\)/P["\1"]="\2"\
+D["\1"]=" \3\\\\\\n"\\/p
+t cont
+s/^ \('"$ac_word_re"'\)[	 ]*\(.*\)/D["\1"]=" \2\\\\\\n"\\/p
+t cont
+d
+:cont
+n
+s/.\{148\}/&'"$ac_delim"'/g
+t clear
+:clear
+s/\\$//
+t bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/"/p
+d
+:bsnlc
+s/["\\]/\\&/g; s/^/"/; s/$/\\\\\\n"\\/p
+b cont
+' <confdefs.h | sed '
+s/'"$ac_delim"'/"\\\
+"/g' >>$CONFIG_STATUS || ac_write_fail=1
+
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+  for (key in D) D_is_set[key] = 1
+  FS = ""
+}
+/^[\t ]*#[\t ]*(define|undef)[\t ]+$ac_word_re([\t (]|\$)/ {
+  line = \$ 0
+  split(line, arg, " ")
+  if (arg[1] == "#") {
+    defundef = arg[2]
+    mac1 = arg[3]
+  } else {
+    defundef = substr(arg[1], 2)
+    mac1 = arg[2]
+  }
+  split(mac1, mac2, "(") #)
+  macro = mac2[1]
+  prefix = substr(line, 1, index(line, defundef) - 1)
+  if (D_is_set[macro]) {
+    # Preserve the white space surrounding the "#".
+    print prefix "define", macro P[macro] D[macro]
+    next
+  } else {
+    # Replace #undef with comments.  This is necessary, for example,
+    # in the case of _POSIX_SOURCE, which is predefined and required
+    # on some systems where configure will not decide to define it.
+    if (defundef == "undef") {
+      print "/*", prefix defundef, macro, "*/"
+      next
+    }
+  }
+}
+{ print }
+_ACAWK
+_ACEOF
+cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
+  as_fn_error $? "could not setup config headers machinery" "$LINENO" 5
+fi # test -n "$CONFIG_HEADERS"
+
+
+eval set X "    :H $CONFIG_HEADERS    "
+shift
+for ac_tag
+do
+  case $ac_tag in
+  :[FHLC]) ac_mode=$ac_tag; continue;;
+  esac
+  case $ac_mode$ac_tag in
+  :[FHL]*:*);;
+  :L* | :C*:*) as_fn_error $? "invalid tag '$ac_tag'" "$LINENO" 5;;
+  :[FH]-) ac_tag=-:-;;
+  :[FH]*) ac_tag=$ac_tag:$ac_tag.in;;
+  esac
+  ac_save_IFS=$IFS
+  IFS=:
+  set x $ac_tag
+  IFS=$ac_save_IFS
+  shift
+  ac_file=$1
+  shift
+
+  case $ac_mode in
+  :L) ac_source=$1;;
+  :[FH])
+    ac_file_inputs=
+    for ac_f
+    do
+      case $ac_f in
+      -) ac_f="$ac_tmp/stdin";;
+      *) # Look for the file first in the build tree, then in the source tree
+	 # (if the path is not absolute).  The absolute path cannot be DOS-style,
+	 # because $ac_f cannot contain ':'.
+	 test -f "$ac_f" ||
+	   case $ac_f in
+	   [\\/$]*) false;;
+	   *) test -f "$srcdir/$ac_f" && ac_f="$srcdir/$ac_f";;
+	   esac ||
+	   as_fn_error 1 "cannot find input file: '$ac_f'" "$LINENO" 5;;
+      esac
+      case $ac_f in *\'*) ac_f=`printf "%s\n" "$ac_f" | sed "s/'/'\\\\\\\\''/g"`;; esac
+      as_fn_append ac_file_inputs " '$ac_f'"
+    done
+
+    # Let's still pretend it is 'configure' which instantiates (i.e., don't
+    # use $as_me), people would be surprised to read:
+    #    /* config.h.  Generated by config.status.  */
+    configure_input='Generated from '`
+	  printf "%s\n" "$*" | sed 's|^[^:]*/||;s|:[^:]*/|, |g'
+	`' by configure.'
+    if test x"$ac_file" != x-; then
+      configure_input="$ac_file.  $configure_input"
+      { printf "%s\n" "$as_me:${as_lineno-$LINENO}: creating $ac_file" >&5
+printf "%s\n" "$as_me: creating $ac_file" >&6;}
+    fi
+    # Neutralize special characters interpreted by sed in replacement strings.
+    case $configure_input in #(
+    *\&* | *\|* | *\\* )
+       ac_sed_conf_input=`printf "%s\n" "$configure_input" |
+       sed 's/[\\\\&|]/\\\\&/g'`;; #(
+    *) ac_sed_conf_input=$configure_input;;
+    esac
+
+    case $ac_tag in
+    *:-:* | *:-) cat >"$ac_tmp/stdin" \
+      || as_fn_error $? "could not create $ac_file" "$LINENO" 5 ;;
+    esac
+    ;;
+  esac
+
+  ac_dir=`$as_dirname -- "$ac_file" ||
+$as_expr X"$ac_file" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
+	 X"$ac_file" : 'X\(//\)[^/]' \| \
+	 X"$ac_file" : 'X\(//\)$' \| \
+	 X"$ac_file" : 'X\(/\)' \| . 2>/dev/null ||
+printf "%s\n" X"$ac_file" |
+    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)[^/].*/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\/\)$/{
+	    s//\1/
+	    q
+	  }
+	  /^X\(\/\).*/{
+	    s//\1/
+	    q
+	  }
+	  s/.*/./; q'`
+  as_dir="$ac_dir"; as_fn_mkdir_p
+  ac_builddir=.
+
+case "$ac_dir" in
+.) ac_dir_suffix= ac_top_builddir_sub=. ac_top_build_prefix= ;;
+*)
+  ac_dir_suffix=/`printf "%s\n" "$ac_dir" | sed 's|^\.[\\/]||'`
+  # A ".." for each directory in $ac_dir_suffix.
+  ac_top_builddir_sub=`printf "%s\n" "$ac_dir_suffix" | sed 's|/[^\\/]*|/..|g;s|/||'`
+  case $ac_top_builddir_sub in
+  "") ac_top_builddir_sub=. ac_top_build_prefix= ;;
+  *)  ac_top_build_prefix=$ac_top_builddir_sub/ ;;
+  esac ;;
+esac
+ac_abs_top_builddir=$ac_pwd
+ac_abs_builddir=$ac_pwd$ac_dir_suffix
+# for backward compatibility:
+ac_top_builddir=$ac_top_build_prefix
+
+case $srcdir in
+  .)  # We are building in place.
+    ac_srcdir=.
+    ac_top_srcdir=$ac_top_builddir_sub
+    ac_abs_top_srcdir=$ac_pwd ;;
+  [\\/]* | ?:[\\/]* )  # Absolute name.
+    ac_srcdir=$srcdir$ac_dir_suffix;
+    ac_top_srcdir=$srcdir
+    ac_abs_top_srcdir=$srcdir ;;
+  *) # Relative name.
+    ac_srcdir=$ac_top_build_prefix$srcdir$ac_dir_suffix
+    ac_top_srcdir=$ac_top_build_prefix$srcdir
+    ac_abs_top_srcdir=$ac_pwd/$srcdir ;;
+esac
+ac_abs_srcdir=$ac_abs_top_srcdir$ac_dir_suffix
+
+
+  case $ac_mode in
+
+  :H)
+  #
+  # CONFIG_HEADER
+  #
+  if test x"$ac_file" != x-; then
+    {
+      printf "%s\n" "/* $configure_input  */" >&1 \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs"
+    } >"$ac_tmp/config.h" \
+      || as_fn_error $? "could not create $ac_file" "$LINENO" 5
+    if diff "$ac_file" "$ac_tmp/config.h" >/dev/null 2>&1; then
+      { printf "%s\n" "$as_me:${as_lineno-$LINENO}: $ac_file is unchanged" >&5
+printf "%s\n" "$as_me: $ac_file is unchanged" >&6;}
+    else
+      rm -f "$ac_file"
+      mv "$ac_tmp/config.h" "$ac_file" \
+	|| as_fn_error $? "could not create $ac_file" "$LINENO" 5
+    fi
+  else
+    printf "%s\n" "/* $configure_input  */" >&1 \
+      && eval '$AWK -f "$ac_tmp/defines.awk"' "$ac_file_inputs" \
+      || as_fn_error $? "could not create -" "$LINENO" 5
+  fi
+ ;;
+
+
+  esac
+
+done # for ac_tag
+
+
+as_fn_exit 0
+_ACEOF
+ac_clean_files=$ac_clean_files_save
+
+test $ac_write_fail = 0 ||
+  as_fn_error $? "write failure creating $CONFIG_STATUS" "$LINENO" 5
+
+
+# configure is writing to config.log, and then calls config.status.
+# config.status does its own redirection, appending to config.log.
+# Unfortunately, on DOS this fails, as config.log is still kept open
+# by configure, so config.status won't be able to write to it; its
+# output is simply discarded.  So we exec the FD to /dev/null,
+# effectively closing config.log, so it can be properly (re)opened and
+# appended to by config.status.  When coming back to configure, we
+# need to make the FD available again.
+if test "$no_create" != yes; then
+  ac_cs_success=:
+  ac_config_status_args=
+  test "$silent" = yes &&
+    ac_config_status_args="$ac_config_status_args --quiet"
+  exec 5>/dev/null
+  $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false
+  exec 5>>config.log
+  # Use ||, not &&, to avoid exiting from the if with $? = 1, which
+  # would make configure fail if this is the last instruction.
+  $ac_cs_success || as_fn_exit 1
+fi
+if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: unrecognized options: $ac_unrecognized_opts" >&5
+printf "%s\n" "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
+fi
+
 
diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_INIT([Haskell network package],
-        [3.1.2.9],
+        [3.2.7.0],
         [libraries@haskell.org],
         [network])
 
@@ -86,6 +86,8 @@
 AC_CHECK_DECLS([IPV6_V6ONLY])
 AC_CHECK_DECLS([IPPROTO_IP, IPPROTO_TCP, IPPROTO_IPV6])
 AC_CHECK_DECLS([SO_PEERCRED])
+AC_CHECK_DECLS([IP_DONTFRAG])
+AC_CHECK_DECLS([IP_MTU_DISCOVER])
 
 AC_CHECK_MEMBERS([struct msghdr.msg_control, struct msghdr.msg_accrights])
 AC_CHECK_MEMBERS([struct sockaddr.sa_len])
diff --git a/examples/EchoClient.hs b/examples/EchoClient.hs
--- a/examples/EchoClient.hs
+++ b/examples/EchoClient.hs
@@ -1,9 +1,11 @@
 {-# LANGUAGE OverloadedStrings #-}
+
 -- Echo client program
 module Main (main) where
 
 import qualified Control.Exception as E
 import qualified Data.ByteString.Char8 as C
+import qualified Data.List.NonEmpty as NE
 import Network.Socket
 import Network.Socket.ByteString (recv, sendAll)
 
@@ -21,8 +23,8 @@
     E.bracket (open addr) close client
   where
     resolve = do
-        let hints = defaultHints { addrSocketType = Stream }
-        head <$> getAddrInfo (Just hints) (Just host) (Just port)
+        let hints = defaultHints{addrSocketType = Stream}
+        NE.head <$> getAddrInfo (Just hints) (Just host) (Just port)
     open addr = E.bracketOnError (openSocket addr) close $ \sock -> do
         connect sock $ addrAddress addr
         return sock
diff --git a/examples/EchoServer.hs b/examples/EchoServer.hs
--- a/examples/EchoServer.hs
+++ b/examples/EchoServer.hs
@@ -3,8 +3,9 @@
 
 import Control.Concurrent (forkFinally)
 import qualified Control.Exception as E
-import Control.Monad (unless, forever, void)
+import Control.Monad (forever, unless, void)
 import qualified Data.ByteString as S
+import qualified Data.List.NonEmpty as NE
 import Network.Socket
 import Network.Socket.ByteString (recv, sendAll)
 
@@ -14,8 +15,8 @@
     talk s = do
         msg <- recv s 1024
         unless (S.null msg) $ do
-          sendAll s msg
-          talk s
+            sendAll s msg
+            talk s
 
 -- from the "network-run" package.
 runTCPServer :: Maybe HostName -> ServiceName -> (Socket -> IO a) -> IO a
@@ -24,21 +25,24 @@
     E.bracket (open addr) close loop
   where
     resolve = do
-        let hints = defaultHints {
-                addrFlags = [AI_PASSIVE]
-              , addrSocketType = Stream
-              }
-        head <$> getAddrInfo (Just hints) mhost (Just port)
+        let hints =
+                defaultHints
+                    { addrFlags = [AI_PASSIVE]
+                    , addrSocketType = Stream
+                    }
+        NE.head <$> getAddrInfo (Just hints) mhost (Just port)
     open addr = E.bracketOnError (openSocket addr) close $ \sock -> do
         setSocketOption sock ReuseAddr 1
         withFdSocket sock setCloseOnExecIfNeeded
         bind sock $ addrAddress addr
         listen sock 1024
         return sock
-    loop sock = forever $ E.bracketOnError (accept sock) (close . fst)
-        $ \(conn, _peer) -> void $
-            -- 'forkFinally' alone is unlikely to fail thus leaking @conn@,
-            -- but 'E.bracketOnError' above will be necessary if some
-            -- non-atomic setups (e.g. spawning a subprocess to handle
-            -- @conn@) before proper cleanup of @conn@ is your case
-            forkFinally (server conn) (const $ gracefulClose conn 5000)
+    loop sock = forever $
+        E.bracketOnError (accept sock) (close . fst) $
+            \(conn, _peer) ->
+                void $
+                    -- 'forkFinally' alone is unlikely to fail thus leaking @conn@,
+                    -- but 'E.bracketOnError' above will be necessary if some
+                    -- non-atomic setups (e.g. spawning a subprocess to handle
+                    -- @conn@) before proper cleanup of @conn@ is your case
+                    forkFinally (server conn) (const $ gracefulClose conn 5000)
diff --git a/include/HsNet.h b/include/HsNet.h
--- a/include/HsNet.h
+++ b/include/HsNet.h
@@ -29,6 +29,7 @@
 # include <ws2tcpip.h>
 # include <mswsock.h>
 # include "win32defs.h"
+# include "afunix_compat.h"
 # define IPV6_V6ONLY 27
 #endif
 
diff --git a/include/HsNetDef.h b/include/HsNetDef.h
--- a/include/HsNetDef.h
+++ b/include/HsNetDef.h
@@ -10,10 +10,6 @@
 #undef PACKAGE_TARNAME
 #undef PACKAGE_VERSION
 
-#if !defined(mingw32_HOST_OS) && !defined(_WIN32)
-# define DOMAIN_SOCKET_SUPPORT 1
-#endif
-
 #if defined(HAVE_STRUCT_UCRED) && HAVE_DECL_SO_PEERCRED
 # define HAVE_STRUCT_UCRED_SO_PEERCRED 1
 #else
diff --git a/include/HsNetworkConfig.h.in b/include/HsNetworkConfig.h.in
--- a/include/HsNetworkConfig.h.in
+++ b/include/HsNetworkConfig.h.in
@@ -1,57 +1,65 @@
 /* include/HsNetworkConfig.h.in.  Generated from configure.ac by autoheader.  */
 
-/* Define to 1 if you have the `accept4' function. */
+/* Define to 1 if you have the 'accept4' function. */
 #undef HAVE_ACCEPT4
 
 /* Define to 1 if you have the <arpa/inet.h> header file. */
 #undef HAVE_ARPA_INET_H
 
-/* Define to 1 if you have the declaration of `AI_ADDRCONFIG', and to 0 if you
+/* Define to 1 if you have the declaration of 'AI_ADDRCONFIG', and to 0 if you
    don't. */
 #undef HAVE_DECL_AI_ADDRCONFIG
 
-/* Define to 1 if you have the declaration of `AI_ALL', and to 0 if you don't.
+/* Define to 1 if you have the declaration of 'AI_ALL', and to 0 if you don't.
    */
 #undef HAVE_DECL_AI_ALL
 
-/* Define to 1 if you have the declaration of `AI_NUMERICSERV', and to 0 if
+/* Define to 1 if you have the declaration of 'AI_NUMERICSERV', and to 0 if
    you don't. */
 #undef HAVE_DECL_AI_NUMERICSERV
 
-/* Define to 1 if you have the declaration of `AI_V4MAPPED', and to 0 if you
+/* Define to 1 if you have the declaration of 'AI_V4MAPPED', and to 0 if you
    don't. */
 #undef HAVE_DECL_AI_V4MAPPED
 
-/* Define to 1 if you have the declaration of `IPPROTO_IP', and to 0 if you
+/* Define to 1 if you have the declaration of 'IPPROTO_IP', and to 0 if you
    don't. */
 #undef HAVE_DECL_IPPROTO_IP
 
-/* Define to 1 if you have the declaration of `IPPROTO_IPV6', and to 0 if you
+/* Define to 1 if you have the declaration of 'IPPROTO_IPV6', and to 0 if you
    don't. */
 #undef HAVE_DECL_IPPROTO_IPV6
 
-/* Define to 1 if you have the declaration of `IPPROTO_TCP', and to 0 if you
+/* Define to 1 if you have the declaration of 'IPPROTO_TCP', and to 0 if you
    don't. */
 #undef HAVE_DECL_IPPROTO_TCP
 
-/* Define to 1 if you have the declaration of `IPV6_V6ONLY', and to 0 if you
+/* Define to 1 if you have the declaration of 'IPV6_V6ONLY', and to 0 if you
    don't. */
 #undef HAVE_DECL_IPV6_V6ONLY
 
-/* Define to 1 if you have the declaration of `SO_PEERCRED', and to 0 if you
+/* Define to 1 if you have the declaration of 'IP_DONTFRAG', and to 0 if you
    don't. */
+#undef HAVE_DECL_IP_DONTFRAG
+
+/* Define to 1 if you have the declaration of 'IP_MTU_DISCOVER', and to 0 if
+   you don't. */
+#undef HAVE_DECL_IP_MTU_DISCOVER
+
+/* Define to 1 if you have the declaration of 'SO_PEERCRED', and to 0 if you
+   don't. */
 #undef HAVE_DECL_SO_PEERCRED
 
 /* Define to 1 if you have the <fcntl.h> header file. */
 #undef HAVE_FCNTL_H
 
-/* Define to 1 if you have the `gai_strerror' function. */
+/* Define to 1 if you have the 'gai_strerror' function. */
 #undef HAVE_GAI_STRERROR
 
-/* Define to 1 if you have the `gethostent' function. */
+/* Define to 1 if you have the 'gethostent' function. */
 #undef HAVE_GETHOSTENT
 
-/* Define to 1 if you have the `getpeereid' function. */
+/* Define to 1 if you have the 'getpeereid' function. */
 #undef HAVE_GETPEEREID
 
 /* Define to 1 if you have the <inttypes.h> header file. */
@@ -60,9 +68,6 @@
 /* Define to 1 if you have the <limits.h> header file. */
 #undef HAVE_LIMITS_H
 
-/* Define to 1 if you have the <memory.h> header file. */
-#undef HAVE_MEMORY_H
-
 /* Define to 1 if you have the <netdb.h> header file. */
 #undef HAVE_NETDB_H
 
@@ -81,6 +86,9 @@
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
+/* Define to 1 if you have the <stdio.h> header file. */
+#undef HAVE_STDIO_H
+
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 
@@ -90,16 +98,16 @@
 /* Define to 1 if you have the <string.h> header file. */
 #undef HAVE_STRING_H
 
-/* Define to 1 if `msg_accrights' is a member of `struct msghdr'. */
+/* Define to 1 if 'msg_accrights' is a member of 'struct msghdr'. */
 #undef HAVE_STRUCT_MSGHDR_MSG_ACCRIGHTS
 
-/* Define to 1 if `msg_control' is a member of `struct msghdr'. */
+/* Define to 1 if 'msg_control' is a member of 'struct msghdr'. */
 #undef HAVE_STRUCT_MSGHDR_MSG_CONTROL
 
-/* Define to 1 if `sa_len' is a member of `struct sockaddr'. */
+/* Define to 1 if 'sa_len' is a member of 'struct sockaddr'. */
 #undef HAVE_STRUCT_SOCKADDR_SA_LEN
 
-/* Define to 1 if the system has the type `struct ucred'. */
+/* Define to 1 if the system has the type 'struct ucred'. */
 #undef HAVE_STRUCT_UCRED
 
 /* Define to 1 if you have the <sys/socket.h> header file. */
@@ -138,8 +146,10 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION
 
-/* Define to 1 if you have the ANSI C header files. */
+/* Define to 1 if all of the C89 standard headers exist (not just the ones
+   required in a freestanding environment). This macro is provided for
+   backward compatibility; new code need not use it. */
 #undef STDC_HEADERS
 
-/* Define to empty if `const' does not conform to ANSI C. */
+/* Define to empty if 'const' does not conform to ANSI C. */
 #undef const
diff --git a/include/afunix_compat.h b/include/afunix_compat.h
new file mode 100644
--- /dev/null
+++ b/include/afunix_compat.h
@@ -0,0 +1,23 @@
+/* The version of afunix.h provided by the version of MSYS2 included with x86
+ * versions of GHC before GHC 9.2 excludes certain components introduced with
+ * Windows Vista.
+ */
+
+#ifndef AFUNIX_COMPAT_H
+#define AFUNIX_COMPAT_H
+
+#if defined(_AFUNIX_) || !defined(_WIN32) || __GLASGOW_HASKELL__ > 902
+# include <afunix.h>
+#else
+
+#define UNIX_PATH_MAX 108
+
+typedef struct sockaddr_un {
+  ADDRESS_FAMILY sun_family;
+  char sun_path[UNIX_PATH_MAX];
+} SOCKADDR_UN, *PSOCKADDR_UN;
+
+#define SIO_AF_UNIX_GETPEERPID _WSAIOR(IOC_VENDOR, 256)
+
+#endif /* GHC version check */
+#endif /* AFUNIX_COMPAT_H */
diff --git a/network.cabal b/network.cabal
--- a/network.cabal
+++ b/network.cabal
@@ -1,14 +1,15 @@
 cabal-version:      1.18
 name:               network
-version:            3.1.2.9
+version:            3.2.8.0
 license:            BSD3
 license-file:       LICENSE
-maintainer:         Kazu Yamamoto, Evan Borden
+maintainer:         Kazu Yamamoto, Tamar Christina
 
 tested-with:
-    GHC == 9.6.1
-    GHC == 9.4.4
-    GHC == 9.2.7
+    GHC == 9.8.2
+    GHC == 9.6.4
+    GHC == 9.4.8
+    GHC == 9.2.8
     GHC == 9.0.2
     GHC == 8.10.7
     GHC == 8.8.4
@@ -66,6 +67,7 @@
     include/HsNetworkConfig.h.in
     include/HsNet.h
     include/HsNetDef.h
+    include/afunix_compat.h
     cbits/asyncAccept.c
     cbits/initWinSock.c
     cbits/winSockErr.c
@@ -113,6 +115,7 @@
         Network.Socket.Name
         Network.Socket.Options
         Network.Socket.ReadShow
+        Network.Socket.STM
         Network.Socket.Shutdown
         Network.Socket.SockAddr
         Network.Socket.Syscall
@@ -121,14 +124,17 @@
 
     default-language: Haskell2010
     include-dirs:     include
-    includes:         HsNet.h HsNetDef.h alignment.h win32defs.h
     install-includes: HsNet.h HsNetDef.h alignment.h win32defs.h
+    if os(windows)
+        install-includes: afunix_compat.h
+
     ghc-options:      -Wall -fwarn-tabs
     build-depends:
         base >=4.9 && <5,
-        bytestring >=0.10 && <0.12,
+        bytestring >=0.10,
         deepseq,
-        directory
+        directory,
+        stm
 
     if !os(windows)
         other-modules:
@@ -167,6 +173,12 @@
             cpp-options: -D_WIN32_WINNT=0x0600
             cc-options:  -D_WIN32_WINNT=0x0600
 
+        build-depends:
+            temporary
+
+    if impl(ghc >=8)
+        default-extensions: Strict StrictData
+
 test-suite spec
     type:             exitcode-stdio-1.0
     main-is:          Spec.hs
@@ -181,7 +193,7 @@
     default-language: Haskell2010
     ghc-options:      -Wall -threaded
     build-depends:
-        base >=4.9 && <5,
+        base,
         bytestring,
         directory,
         HUnit,
@@ -192,3 +204,9 @@
 
     if flag(devel)
         cpp-options: -DDEVELOPMENT
+
+    if impl(ghc >=8)
+        default-extensions: Strict StrictData
+
+    if os(windows)
+        cpp-options: -D_WIN32
diff --git a/tests/BadFileDescriptor.hs b/tests/BadFileDescriptor.hs
--- a/tests/BadFileDescriptor.hs
+++ b/tests/BadFileDescriptor.hs
@@ -7,7 +7,7 @@
 module Main where
 
 import Control.Concurrent (forkIO)
-import Control.Monad (void, forever)
+import Control.Monad (forever, void)
 import Network.Socket hiding (recv)
 import Network.Socket.ByteString (recv, sendAll)
 
@@ -32,11 +32,12 @@
 
 serverSocket :: HostName -> ServiceName -> IO Socket
 serverSocket host port = do
-    let hints = defaultHints {
-                addrFlags = [AI_PASSIVE]
-              , addrSocketType = Stream
-              }
-    addr:_ <- getAddrInfo (Just hints) (Just host) (Just port)
+    let hints =
+            defaultHints
+                { addrFlags = [AI_PASSIVE]
+                , addrSocketType = Stream
+                }
+    addr : _ <- getAddrInfo (Just hints) (Just host) (Just port)
     sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
     bind sock (addrAddress addr)
     listen sock 1
@@ -44,8 +45,8 @@
 
 clientSocket :: HostName -> ServiceName -> IO Socket
 clientSocket host port = do
-    let hints = defaultHints { addrSocketType = Stream }
-    addr:_ <- getAddrInfo (Just hints) (Just host) (Just port)
+    let hints = defaultHints{addrSocketType = Stream}
+    addr : _ <- getAddrInfo (Just hints) (Just host) (Just port)
     sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
     connect sock (addrAddress addr)
     return sock
diff --git a/tests/Network/Socket/ByteString/LazySpec.hs b/tests/Network/Socket/ByteString/LazySpec.hs
--- a/tests/Network/Socket/ByteString/LazySpec.hs
+++ b/tests/Network/Socket/ByteString/LazySpec.hs
@@ -5,11 +5,11 @@
 
 import Prelude hiding (getContents)
 
+import Control.Monad
 import qualified Data.ByteString.Lazy as L
 import Network.Socket
 import Network.Socket.ByteString.Lazy
 import Network.Test.Common
-import Control.Monad
 
 import Test.Hspec
 
diff --git a/tests/Network/Socket/ByteStringSpec.hs b/tests/Network/Socket/ByteStringSpec.hs
--- a/tests/Network/Socket/ByteStringSpec.hs
+++ b/tests/Network/Socket/ByteStringSpec.hs
@@ -3,11 +3,11 @@
 module Network.Socket.ByteStringSpec (main, spec) where
 
 import Control.Concurrent.MVar (newEmptyMVar, putMVar, takeMVar)
-import Data.Bits
-import Data.Maybe
 import Control.Monad
+import Data.Bits
 import qualified Data.ByteString as S
 import qualified Data.ByteString.Char8 as C
+import Data.Maybe
 import Network.Socket
 import Network.Socket.ByteString
 import Network.Test.Common
@@ -243,20 +243,23 @@
             serverReady <- newEmptyMVar
 
             let server sock = do
-                    whenSupported RecvIPv4TTL     $ setSocketOption sock RecvIPv4TTL 1
+                    whenSupported RecvIPv4TTL $ setSocketOption sock RecvIPv4TTL 1
                     whenSupported RecvIPv4PktInfo $ setSocketOption sock RecvIPv4PktInfo 1
-                    whenSupported RecvIPv4TOS     $ setSocketOption sock RecvIPv4TOS 1
+                    whenSupported RecvIPv4TOS $ setSocketOption sock RecvIPv4TOS 1
                     putMVar serverReady ()
 
                     (_, _, cmsgs, _) <- recvMsg sock 1024 128 mempty
 
                     whenSupported RecvIPv4PktInfo $
-                      ((lookupCmsg CmsgIdIPv4PktInfo cmsgs >>= decodeCmsg) :: Maybe IPv4PktInfo) `shouldNotBe` Nothing
+                        ((lookupCmsg CmsgIdIPv4PktInfo cmsgs >>= decodeCmsg) :: Maybe IPv4PktInfo)
+                            `shouldNotBe` Nothing
                     when (not isAppVeyor) $ do
-                      whenSupported RecvIPv4TTL $
-                        ((lookupCmsg CmsgIdIPv4TTL cmsgs >>= decodeCmsg) :: Maybe IPv4TTL) `shouldNotBe` Nothing
-                      whenSupported RecvIPv4TOS $
-                        ((lookupCmsg CmsgIdIPv4TOS cmsgs >>= decodeCmsg) :: Maybe IPv4TOS) `shouldNotBe` Nothing
+                        whenSupported RecvIPv4TTL $
+                            ((lookupCmsg CmsgIdIPv4TTL cmsgs >>= decodeCmsg) :: Maybe IPv4TTL)
+                                `shouldNotBe` Nothing
+                        whenSupported RecvIPv4TOS $
+                            ((lookupCmsg CmsgIdIPv4TOS cmsgs >>= decodeCmsg) :: Maybe IPv4TOS)
+                                `shouldNotBe` Nothing
                 client sock addr = takeMVar serverReady >> sendTo sock seg addr
 
                 seg = C.pack "This is a test message"
@@ -270,18 +273,21 @@
 
             let server sock = do
                     whenSupported RecvIPv6HopLimit $ setSocketOption sock RecvIPv6HopLimit 1
-                    whenSupported RecvIPv6TClass   $ setSocketOption sock RecvIPv6TClass 1
-                    whenSupported RecvIPv6PktInfo  $ setSocketOption sock RecvIPv6PktInfo 1
+                    whenSupported RecvIPv6TClass $ setSocketOption sock RecvIPv6TClass 1
+                    whenSupported RecvIPv6PktInfo $ setSocketOption sock RecvIPv6PktInfo 1
                     putMVar serverReady ()
 
                     (_, _, cmsgs, _) <- recvMsg sock 1024 128 mempty
 
                     whenSupported RecvIPv6HopLimit $
-                      ((lookupCmsg CmsgIdIPv6HopLimit cmsgs >>= decodeCmsg) :: Maybe IPv6HopLimit) `shouldNotBe` Nothing
+                        ((lookupCmsg CmsgIdIPv6HopLimit cmsgs >>= decodeCmsg) :: Maybe IPv6HopLimit)
+                            `shouldNotBe` Nothing
                     whenSupported RecvIPv6TClass $
-                      ((lookupCmsg CmsgIdIPv6TClass cmsgs >>= decodeCmsg) :: Maybe IPv6TClass) `shouldNotBe` Nothing
+                        ((lookupCmsg CmsgIdIPv6TClass cmsgs >>= decodeCmsg) :: Maybe IPv6TClass)
+                            `shouldNotBe` Nothing
                     whenSupported RecvIPv6PktInfo $
-                      ((lookupCmsg CmsgIdIPv6PktInfo cmsgs >>= decodeCmsg) :: Maybe IPv6PktInfo) `shouldNotBe` Nothing
+                        ((lookupCmsg CmsgIdIPv6PktInfo cmsgs >>= decodeCmsg) :: Maybe IPv6PktInfo)
+                            `shouldNotBe` Nothing
                 client sock addr = takeMVar serverReady >> sendTo sock seg addr
 
                 seg = C.pack "This is a test message"
@@ -294,8 +300,8 @@
             serverReady <- newEmptyMVar
 
             let server sock = do
-                    whenSupported RecvIPv4TTL     $ setSocketOption sock RecvIPv4TTL 1
-                    whenSupported RecvIPv4TOS     $ setSocketOption sock RecvIPv4TOS 1
+                    whenSupported RecvIPv4TTL $ setSocketOption sock RecvIPv4TTL 1
+                    whenSupported RecvIPv4TOS $ setSocketOption sock RecvIPv4TOS 1
                     whenSupported RecvIPv4PktInfo $ setSocketOption sock RecvIPv4PktInfo 1
                     putMVar serverReady ()
 
diff --git a/tests/Network/SocketSpec.hs b/tests/Network/SocketSpec.hs
--- a/tests/Network/SocketSpec.hs
+++ b/tests/Network/SocketSpec.hs
@@ -12,8 +12,9 @@
 import Network.Socket.ByteString
 import Network.Test.Common
 import System.Mem (performGC)
-import System.IO.Error (tryIOError, isAlreadyInUseError)
+import System.IO.Error (tryIOError)
 import System.IO.Temp (withSystemTempDirectory)
+import System.Posix.Types (Fd(..))
 import Foreign.C.Types ()
 
 import Test.Hspec
@@ -70,9 +71,12 @@
             bind sock (addrAddress addr) `shouldThrow` anyIOException
 #endif
 
-        it "successfully binds to a unix socket, twice" $ do
+        it "successfully binds to a unix socket" $ do
             withSystemTempDirectory "haskell-network" $ \path -> do
                 let sfile = path ++ "/socket-file"
+                -- exist <- doesFileExist sfile
+                -- when exist $ removeFile sfile
+                -- removeFile sfile
                 let addr = SockAddrUnix sfile
                 when (isSupportedSockAddr addr) $ do
                     sock0 <- socket AF_UNIX Stream defaultProtocol
@@ -82,23 +86,10 @@
                     sock1 <- socket AF_UNIX Stream defaultProtocol
                     tryIOError (bind sock1 addr) >>= \o -> case o of
                         Right () -> error "bind should have failed but succeeded"
-                        Left e | not (isAlreadyInUseError e) -> ioError e
-                        _ -> return ()
+                        _        -> return ()
 
                     close sock0
-
-                    -- Unix systems tend to leave the file existing, which is
-                    -- why our `bind` does its workaround. however if any
-                    -- system in the future does fix this issue, we don't want
-                    -- this test to fail, since that would defeat the purpose
-                    -- of our workaround. but you can uncomment the below lines
-                    -- if you want to play with this on your own system.
-                    --import System.Directory (doesPathExist)
-                    --ex <- doesPathExist sfile
-                    --unless ex $ error "socket file was deleted unexpectedly"
-
-                    sock2 <- socket AF_UNIX Stream defaultProtocol
-                    bind sock2 addr
+                    close sock1
 
     describe "UserTimeout" $ do
         it "can be set" $ do
@@ -127,7 +118,7 @@
 
         it "does not cause segfault on macOS 10.8.2 due to AI_NUMERICSERV" $ do
             let hints = defaultHints { addrFlags = [AI_NUMERICSERV] }
-            void $ getAddrInfo (Just hints) (Just "localhost") Nothing
+            void (getAddrInfo (Just hints) (Just "localhost") Nothing :: IO [AddrInfo])
 
 #if defined(mingw32_HOST_OS)
     let lpdevname = "loopback_0"
@@ -388,6 +379,12 @@
             let msgid = CmsgId (-300) (-300) in
             show msgid `shouldBe` "CmsgId (-300) (-300)"
 
+#if !defined(_WIN32)
+    describe "bijective encodeCmsg-decodeCmsg roundtrip equality" $ do
+        it "holds for [Fd]" $ forAll genFds $
+            \x -> (decodeCmsg . encodeCmsg $ x) == Just (x :: [Fd])
+#endif
+
     describe "bijective read-show roundtrip equality" $ do
         it "holds for Family" $ forAll familyGen $
             \x -> (read . show $ x) == (x :: Family)
@@ -425,6 +422,9 @@
 cmsgidGen :: Gen CmsgId
 cmsgidGen = biasedGen (\g -> CmsgId <$> g <*> g) cmsgidPatterns arbitrary
 
+genFds :: Gen [Fd]
+genFds = listOf (Fd <$> arbitrary)
+
 -- pruned lists of pattern synonym values for each type to generate values from
 
 familyPatterns :: [Family]
@@ -456,11 +456,11 @@
 sockoptPatterns = nub
     [UnsupportedSocketOption
     ,Debug,ReuseAddr,SoDomain,Type,SoProtocol,SoError,DontRoute
-    ,Broadcast,SendBuffer,RecvBuffer,KeepAlive,OOBInline,TimeToLive
-    ,MaxSegment,NoDelay,Cork,Linger,ReusePort
+    ,Broadcast,SendBuffer,RecvBuffer,KeepAlive,KeepInit,OOBInline
+    ,TimeToLive,MaxSegment,NoDelay,Cork,Linger,ReusePort
     ,RecvLowWater,SendLowWater,RecvTimeOut,SendTimeOut
     ,UseLoopBack,UserTimeout,IPv6Only
-    ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo
+    ,RecvIPv4TTL,RecvIPv4TOS,RecvIPv4PktInfo,DontFragment
     ,RecvIPv6HopLimit,RecvIPv6TClass,RecvIPv6PktInfo]
 
 cmsgidPatterns :: [CmsgId]
@@ -472,5 +472,5 @@
     , CmsgIdIPv6TClass
     , CmsgIdIPv4PktInfo
     , CmsgIdIPv6PktInfo
-    , CmsgIdFd
+    , CmsgIdFds
     ]
diff --git a/tests/Network/Test/Common.hs b/tests/Network/Test/Common.hs
--- a/tests/Network/Test/Common.hs
+++ b/tests/Network/Test/Common.hs
@@ -35,6 +35,7 @@
 import Control.Monad
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Lazy as L
+import qualified Data.List.NonEmpty as NE
 import Network.Socket
 import System.Directory
 import System.Timeout (timeout)
@@ -244,7 +245,7 @@
 
 resolveClient :: SocketType -> HostName -> PortNumber -> IO AddrInfo
 resolveClient socketType host port =
-    head <$> getAddrInfo (Just hints) (Just host) (Just $ show port)
+    NE.head <$> getAddrInfo (Just hints) (Just host) (Just $ show port)
   where
     hints = defaultHints {
         addrSocketType = socketType
@@ -253,7 +254,7 @@
 
 resolveServer :: SocketType -> HostName -> IO AddrInfo
 resolveServer socketType host =
-    head <$> getAddrInfo (Just hints) (Just host) Nothing
+    NE.head <$> getAddrInfo (Just hints) (Just host) Nothing
   where
     hints = defaultHints {
         addrSocketType = socketType
