diff --git a/README b/README
deleted file mode 100644
--- a/README
+++ /dev/null
@@ -1,30 +0,0 @@
-hosc - haskell open sound control
----------------------------------
-
-[hosc][hosc] provides `Sound.OSC`, a [haskell][hs]
-module implementing a subset of the [Open Sound Control][osc] byte protocol.
-hosc is required by the [hsc3][hsc3] haskell [supercollider][sc3] bindings.
-
-See also:
-
-- [hosc-json](?t=hosc-json): JSON text encoding of OSC
-- [hosc-util](?t=hosc-util): non-core OSC functions
-
-© [rohan drape][rd], [stefan kersten][sk] and others, 2007-2020,
-[gpl][gpl]. with contributions by:
-
-- [alex mclean][am]
-- [henning thielemann][ht]
-
-see the [git](https://git-scm.com/) [history](?t=hosc&q=history) for details
-
-[hosc]: http://rohandrape.net/?t=hosc
-[hs]: http://haskell.org/
-[osc]: http://opensoundcontrol.org/
-[hsc3]: http://rohandrape.net/?t=hsc3
-[sc3]: http://audiosynth.com/
-[rd]:  http://rohandrape.net/
-[sk]: http://space.k-hornz.de/
-[am]: http://yaxu.org/
-[ht]: http://www.henning-thielemann.de/Research.html
-[gpl]: http://gnu.org/copyleft/
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,31 @@
+hosc - haskell open sound control
+---------------------------------
+
+[hosc][hosc] provides `Sound.OSC`, a [haskell][hs]
+module implementing a subset of the [Open Sound Control][osc] byte protocol.
+hosc is required by the [hsc3][hsc3] haskell [supercollider][sc3] bindings.
+
+See also:
+
+- [hosc-json](http://rohandrape.net/?t=hosc-json): JSON text encoding of OSC
+- [hosc-util](http://rohandrape.net/?t=hosc-util): non-core OSC functions
+
+© [rohan drape][rd], [stefan kersten][sk] and others, 2007-2021,
+[gpl-3][gpl-3]. with contributions by:
+
+- [alex mclean][am]
+- [henning thielemann][ht]
+
+see the [git](https://git-scm.com/) [history](http://rohandrape.net/?t=hosc&q=history) for details
+
+[hosc]: http://rohandrape.net/?t=hosc
+[hs]: http://haskell.org/
+[osc]: http://opensoundcontrol.org/
+[hsc3]: http://rohandrape.net/?t=hsc3
+[sc3]: http://audiosynth.com/
+[rd]:  http://rohandrape.net/
+[sk]: http://space.k-hornz.de/
+[am]: http://yaxu.org/
+[ht]: http://www.henning-thielemann.de/Research.html
+[gpl]: http://gnu.org/copyleft/
+[gpl-3]: http://gnu.org/licenses/gpl-3.0.html
diff --git a/Sound/OSC/Coding/Decode/Base.hs b/Sound/OSC/Coding/Decode/Base.hs
--- a/Sound/OSC/Coding/Decode/Base.hs
+++ b/Sound/OSC/Coding/Decode/Base.hs
@@ -16,22 +16,22 @@
 import Sound.OSC.Packet {- hosc -}
 import Sound.OSC.Time {- hosc -}
 
--- The plain byte count of an OSC value.
+-- | The plain byte count of an OSC value.
 size :: Datum_Type -> B.ByteString -> Int
 size ty b =
     case ty of
-      'i' -> 4
-      'f' -> 4
-      'd' -> 8
-      't' -> 8 -- timetag
-      'm' -> 4 -- MIDI message
+      'i' -> 4 -- Int32
+      'f' -> 4 -- Float
+      'd' -> 8 -- Double
+      't' -> 8 -- Time (NTP)
+      'm' -> 4 -- MIDI
       's' -> int64_to_int (fromMaybe
                            (error ("size: no terminating zero: " ++ show b))
                            (B.elemIndex 0 b))
       'b' -> decode_i32 (B.take 4 b)
       _ -> error "size: illegal type"
 
--- The storage byte count of an OSC value.
+-- | The storage byte count (aligned) of an OSC value.
 storage :: Datum_Type -> B.ByteString -> Int
 storage ty b =
     case ty of
@@ -39,7 +39,7 @@
       'b' -> let n = size 'b' b in n + align n + 4
       _ -> size ty B.empty
 
--- Decode an OSC datum
+-- | Decode an OSC datum
 decode_datum :: Datum_Type -> B.ByteString -> Datum
 decode_datum ty b =
     case ty of
@@ -50,11 +50,10 @@
       's' -> ASCII_String (decode_ascii (b_take (size 's' b) b))
       'b' -> Blob (b_take (size 'b' b) (B.drop 4 b))
       't' -> TimeStamp (ntpi_to_ntpr (decode_word64 b))
-      'm' -> let [b0,b1,b2,b3] = B.unpack (B.take 4 b)
-             in midi (b0,b1,b2,b3)
+      'm' -> let [b0,b1,b2,b3] = B.unpack (B.take 4 b) in midi (b0,b1,b2,b3)
       _ -> error ("decode_datum: illegal type (" ++ [ty] ++ ")")
 
--- Decode a sequence of OSC datum given a type descriptor string.
+-- | Decode a sequence of OSC datum given a type descriptor string.
 decode_datum_seq :: ASCII -> B.ByteString -> [Datum]
 decode_datum_seq cs b =
     let swap (x,y) = (y,x)
@@ -72,7 +71,7 @@
         arg = decode_datum_seq (descriptor_tags dsc) (b_drop (n + m) b)
     in Message (C.unpack cmd) arg
 
--- Decode a sequence of OSC messages, each one headed by its length
+-- | Decode a sequence of length prefixed (Int32) OSC messages.
 decode_message_seq :: B.ByteString -> [Message]
 decode_message_seq b =
     let s = decode_i32 b
@@ -84,7 +83,7 @@
 decodeBundle :: B.ByteString -> Bundle
 decodeBundle b =
     let h = storage 's' b -- header (should be '#bundle')
-        t = storage 't' (b_drop h b) -- time tag
+        t = storage 't' (b_drop h b) -- time
         (TimeStamp timeStamp) = decode_datum 't' (b_drop h b)
         ms = decode_message_seq (b_drop (h+t) b)
     in Bundle timeStamp ms
diff --git a/Sound/OSC/Coding/Decode/Binary.hs b/Sound/OSC/Coding/Decode/Binary.hs
--- a/Sound/OSC/Coding/Decode/Binary.hs
+++ b/Sound/OSC/Coding/Decode/Binary.hs
@@ -8,13 +8,14 @@
 
 import Control.Applicative {- base -}
 import Control.Monad {- base -}
+import Data.Int {- base -}
+import Data.Word {- base -}
+
 import qualified Data.Binary.Get as G {- binary -}
 import qualified Data.Binary.IEEE754 as I {- data-binary-ieee754 -}
 import qualified Data.ByteString.Char8 as S.C {- bytestring -}
 import qualified Data.ByteString.Lazy as B {- bytestring -}
 import qualified Data.ByteString.Lazy.Char8 as C {- bytestring -}
-import Data.Int {- base -}
-import Data.Word {- base -}
 
 import qualified Sound.OSC.Coding.Byte as Byte {- hosc -}
 import Sound.OSC.Coding.Convert {- hosc -}
@@ -24,18 +25,18 @@
 
 -- | Get a 32 bit integer in big-endian byte order.
 getInt32be :: G.Get Int32
-getInt32be = word32_to_int32 <$> G.getWord32be
+getInt32be = fmap word32_to_int32 G.getWord32be
 
 -- | Get a 64 bit integer in big-endian byte order.
 getInt64be :: G.Get Int64
-getInt64be = word64_to_int64 <$> G.getWord64be
+getInt64be = fmap word64_to_int64 G.getWord64be
 
 -- | Get an aligned OSC string.
 get_string :: G.Get String
 get_string = do
     s <- G.getLazyByteStringNul
     G.skip (int64_to_int (Byte.align (B.length s + 1)))
-    return $ C.unpack s
+    return (C.unpack s)
 
 -- | Get an aligned OSC string.
 get_ascii :: G.Get ASCII
@@ -57,18 +58,18 @@
 get_datum :: Datum_Type -> G.Get Datum
 get_datum ty =
     case ty of
-      'i' -> Int32 <$> getInt32be
-      'h' -> Int64 <$> getInt64be
-      'f' -> Float <$> I.getFloat32be
-      'd' -> Double <$> I.getFloat64be
-      's' -> ASCII_String <$> get_ascii
-      'b' -> Blob   <$> (get_bytes =<< G.getWord32be)
-      't' -> TimeStamp <$> Time.ntpi_to_ntpr <$> G.getWord64be
+      'i' -> fmap Int32 getInt32be
+      'h' -> fmap Int64 getInt64be
+      'f' -> fmap Float I.getFloat32be
+      'd' -> fmap Double I.getFloat64be
+      's' -> fmap ASCII_String get_ascii
+      'b' -> fmap Blob (get_bytes =<< G.getWord32be)
+      't' -> fmap (TimeStamp . Time.ntpi_to_ntpr) G.getWord64be
       'm' -> do b0 <- G.getWord8
                 b1 <- G.getWord8
                 b2 <- G.getWord8
                 b3 <- G.getWord8
-                return $ Midi (MIDI b0 b1 b2 b3)
+                return (Midi (MIDI b0 b1 b2 b3))
       _ -> fail ("get_datum: illegal type " ++ show ty)
 
 -- | Get an OSC 'Message', fail if type descriptor is invalid.
@@ -79,7 +80,7 @@
     case S.C.unpack dsc of
         ',':tags -> do
             arg <- mapM get_datum tags
-            return $ Message cmd arg
+            return (Message cmd arg)
         e -> fail ("get_message: invalid type descriptor string: " ++ e)
 
 -- | Get a sequence of OSC 'Message's, each one headed by its length.
@@ -98,13 +99,12 @@
 get_bundle = do
     h <- G.getByteString (S.C.length Byte.bundleHeader_strict)
     when (h /= Byte.bundleHeader_strict) (fail "get_bundle: not a bundle")
-    t <- Time.ntpi_to_ntpr <$> G.getWord64be
-    ps <- get_message_seq
-    return $ Bundle t ps
+    t <- fmap Time.ntpi_to_ntpr G.getWord64be
+    fmap (Bundle t) get_message_seq
 
 -- | Get an OSC 'Packet'.
 get_packet :: G.Get Packet
-get_packet = (Packet_Bundle <$> get_bundle) <|> (Packet_Message <$> get_message)
+get_packet = fmap Packet_Bundle get_bundle <|> fmap Packet_Message get_message
 
 {-# INLINE decodeMessage #-}
 {-# INLINE decodeBundle #-}
@@ -131,6 +131,6 @@
 decodePacket :: B.ByteString -> Packet
 decodePacket = G.runGet get_packet
 
--- | Decode an OSC packet from a strict ByteString.
+-- | Decode an OSC packet from a strict Char8 ByteString.
 decodePacket_strict :: S.C.ByteString -> Packet
 decodePacket_strict = G.runGet get_packet . B.fromChunks . (:[])
diff --git a/Sound/OSC/Coding/Encode/Builder.hs b/Sound/OSC/Coding/Encode/Builder.hs
--- a/Sound/OSC/Coding/Encode/Builder.hs
+++ b/Sound/OSC/Coding/Encode/Builder.hs
@@ -1,5 +1,3 @@
-{-# LANGUAGE CPP #-}
-
 -- | Optimised encode function for OSC packets.
 module Sound.OSC.Coding.Encode.Builder
     (build_packet
@@ -15,10 +13,6 @@
 import qualified Data.ByteString.Lazy as L {- bytestring -}
 import qualified Blaze.ByteString.Builder as B {- bytestring -}
 import qualified Blaze.ByteString.Builder.Char8 as B {- bytestring -}
-
-#ifdef IMPORT_SEMIGROUP
-import Data.Semigroup
-#endif
 
 import qualified Sound.OSC.Coding.Byte as Byte {- hosc -}
 import qualified Sound.OSC.Coding.Convert as Convert {- hosc -}
diff --git a/Sound/OSC/Datum.hs b/Sound/OSC/Datum.hs
--- a/Sound/OSC/Datum.hs
+++ b/Sound/OSC/Datum.hs
@@ -1,6 +1,7 @@
 -- | Data type for OSC datum.
 module Sound.OSC.Datum where
 
+import Data.Char {- base -}
 import Data.Int {- base -}
 import Data.List {- base -}
 import Data.Maybe {- base -}
@@ -143,7 +144,7 @@
 
 -- * Constructors
 
--- | Type generalised Int32.
+-- | Type generalised 'Int32'.
 --
 -- > int32 (1::Int32) == int32 (1::Integer)
 -- > d_int32 (int32 (maxBound::Int32)) == maxBound
@@ -185,6 +186,10 @@
 midi :: (Word8,Word8,Word8,Word8) -> Datum
 midi (p,q,r,s) = Midi (MIDI p q r s)
 
+-- | 'Blob' of 'blob_pack'.
+blob :: [Word8] -> Datum
+blob = Blob . blob_pack
+
 -- * Descriptor
 
 -- | Message argument types are given by a descriptor.
@@ -205,7 +210,7 @@
 -- | Variant of 'showFFloat' that deletes trailing zeros.
 --
 -- > map (floatPP (Just 4)) [1,pi] == ["1.0","3.1416"]
-floatPP :: RealFloat n => Maybe Int -> n -> String
+floatPP :: RealFloat n => FP_Precision -> n -> String
 floatPP p n =
     let s = showFFloat p n ""
         s' = dropWhile (== '0') (reverse s)
@@ -221,18 +226,22 @@
 
 -- | Pretty printer for vectors.
 --
--- > vecPP [1::Int,2,3] == "<1,2,3>"
-vecPP :: Show a => [a] -> String
-vecPP v = '<' : intercalate "," (map show v) ++ ">"
+-- > vecPP show [1::Int,2,3] == "<1,2,3>"
+vecPP :: (a -> String) -> [a] -> String
+vecPP f v = '<' : intercalate "," (map f v) ++ ">"
 
 -- | Pretty printer for blobs, two-digit zero-padded hexadecimal.
 blobPP :: BLOB -> String
-blobPP = unwords . map (printf "%02X") . Lazy.unpack
+blobPP = ('B':) . vecPP (printf "%02X") . Lazy.unpack
 
+-- | Print strings in double quotes iff they contain white space.
+stringPP :: String -> String
+stringPP x = if any isSpace x then show x else x
+
 {- | Pretty printer for 'Datum'.
 
-> let d = [Int32 1,Float 1.2,string "str",midi (0,0x90,0x40,0x60)]
-> map (datumPP (Just 5)) d ==  ["1","1.2","\"str\"","<0,144,64,96>"]
+> let d = [Int32 1,Float 1.2,string "str",midi (0,0x90,0x40,0x60),blob [12,16]]
+> map (datumPP (Just 5)) d==  ["1","1.2","str","M<0,144,64,96>","B<0C,10>"]
 
 -}
 datumPP :: FP_Precision -> Datum -> String
@@ -242,10 +251,10 @@
       Int64 n -> show n
       Float n -> floatPP p n
       Double n -> floatPP p n
-      ASCII_String s -> show (Char8.unpack s)
+      ASCII_String s -> stringPP (Char8.unpack s)
       Blob s -> blobPP s
       TimeStamp t -> timePP p t
-      Midi (MIDI b1 b2 b3 b4) -> vecPP [b1,b2,b3,b4]
+      Midi (MIDI b1 b2 b3 b4) -> 'M': vecPP show [b1,b2,b3,b4]
 
 -- | Variant of 'datumPP' that appends the 'datum_type_name'.
 datum_pp_typed :: FP_Precision -> Datum -> String
diff --git a/Sound/OSC/Packet.hs b/Sound/OSC/Packet.hs
--- a/Sound/OSC/Packet.hs
+++ b/Sound/OSC/Packet.hs
@@ -10,7 +10,7 @@
 
 -- | OSC address pattern.  This is strictly an ASCII value, however it
 --   is very common to pattern match on addresses and matching on
---   'C.ByteString' requires @OverloadedStrings@.
+--   Data.ByteString.Char8 requires @OverloadedStrings@.
 type Address_Pattern = String
 
 -- | An OSC message, an 'Address_Pattern' and a sequence of 'Datum'.
@@ -116,17 +116,16 @@
 
 -- * Pretty printing
 
--- | Pretty printer for 'Message'.
+{- | Pretty printer for 'Message'.
+
+> messagePP Nothing (Message "/m" [int32 0,float 1.0,string "s",midi (1,2,3,4),blob [1,2,3]])
+-}
 messagePP :: FP_Precision -> Message -> String
-messagePP p (Message a d) =
-    let d' = map (datumPP p) d
-    in unwords ("#message" : a : d')
+messagePP p (Message a d) = let d' = map (datumPP p) d in unwords (a : d')
 
 -- | Pretty printer for 'Bundle'.
 bundlePP :: FP_Precision -> Bundle -> String
-bundlePP p (Bundle t m) =
-    let m' = intersperse ";" (map (messagePP p) m)
-    in unwords ("#bundle" : timePP p t : m')
+bundlePP p (Bundle t m) = let m' = intersperse ";" (map (messagePP p) m) in unwords (timePP p t : m')
 
 -- | Pretty printer for 'Packet'.
 packetPP :: FP_Precision -> Packet -> String
diff --git a/Sound/OSC/Transport/FD/TCP.hs b/Sound/OSC/Transport/FD/TCP.hs
--- a/Sound/OSC/Transport/FD/TCP.hs
+++ b/Sound/OSC/Transport/FD/TCP.hs
@@ -14,7 +14,7 @@
 import qualified Sound.OSC.Transport.FD as FD {- hosc -}
 
 -- | The TCP transport handle data type.
-data TCP = TCP {tcpHandle :: IO.Handle}
+newtype TCP = TCP {tcpHandle :: IO.Handle}
 
 -- | Send packet over TCP.
 tcp_send_packet :: TCP -> Packet.Packet -> IO ()
@@ -49,7 +49,8 @@
 tcp_socket :: (N.Socket -> N.SockAddr -> IO ()) -> Maybe String -> Int -> IO N.Socket
 tcp_socket f host port = do
   fd <- N.socket N.AF_INET N.Stream 0
-  i:_ <- N.getAddrInfo Nothing host (Just (show port))
+  let hints = N.defaultHints {N.addrFamily = N.AF_INET} -- localhost=ipv4
+  i:_ <- N.getAddrInfo (Just hints) host (Just (show port))
   let sa = N.addrAddress i
   _ <- f fd sa
   return fd
diff --git a/Sound/OSC/Transport/FD/UDP.hs b/Sound/OSC/Transport/FD/UDP.hs
--- a/Sound/OSC/Transport/FD/UDP.hs
+++ b/Sound/OSC/Transport/FD/UDP.hs
@@ -2,8 +2,8 @@
 module Sound.OSC.Transport.FD.UDP where
 
 import Control.Exception {- base -}
-import Control.Monad {- base -}
 import Data.Bifunctor {- base -}
+
 import qualified Network.Socket as N {- network -}
 import qualified Network.Socket.ByteString as C {- network -}
 
@@ -13,15 +13,15 @@
 import qualified Sound.OSC.Transport.FD as FD {- hosc -}
 
 -- | The UDP transport handle data type.
-data UDP = UDP {udpSocket :: N.Socket}
+newtype UDP = UDP {udpSocket :: N.Socket}
 
 -- | Return the port number associated with the UDP socket.
 udpPort :: Integral n => UDP -> IO n
 udpPort = fmap fromIntegral . N.socketPort . udpSocket
 
--- | Send packet over UDP.
+-- | Send packet over UDP using 'C.sendAll'.
 upd_send_packet :: UDP -> Packet.Packet -> IO ()
-upd_send_packet (UDP fd) p = void (C.send fd (Builder.encodePacket_strict p))
+upd_send_packet (UDP fd) p = C.sendAll fd (Builder.encodePacket_strict p)
 
 -- | Receive packet over UDP.
 udp_recv_packet :: UDP -> IO Packet.Packet
@@ -45,7 +45,8 @@
 udp_socket :: (N.Socket -> N.SockAddr -> IO ()) -> String -> Int -> IO UDP
 udp_socket f host port = do
   fd <- N.socket N.AF_INET N.Datagram 0
-  i:_ <- N.getAddrInfo Nothing (Just host) (Just (show port))
+  let hints = N.defaultHints {N.addrFamily = N.AF_INET} -- localhost=ipv4
+  i:_ <- N.getAddrInfo (Just hints) (Just host) (Just (show port))
   let sa = N.addrAddress i
   f fd sa
   return (UDP fd)
@@ -80,7 +81,8 @@
 udp_server p = do
   let hints =
         N.defaultHints
-        {N.addrFlags = [N.AI_PASSIVE,N.AI_NUMERICSERV]
+        {N.addrFamily = N.AF_INET -- localhost=ipv4
+        ,N.addrFlags = [N.AI_PASSIVE,N.AI_NUMERICSERV]
         ,N.addrSocketType = N.Datagram}
   a:_ <- N.getAddrInfo (Just hints) Nothing (Just (show p))
   s <- N.socket (N.addrFamily a) (N.addrSocketType a) (N.addrProtocol a)
@@ -88,9 +90,9 @@
   N.bind s (N.addrAddress a)
   return (UDP s)
 
--- | Send variant to send to specified address.
+-- | Send to specified address using 'C.sendAllTo.
 sendTo :: UDP -> Packet.Packet -> N.SockAddr -> IO ()
-sendTo (UDP fd) p = void . C.sendTo fd (Builder.encodePacket_strict p)
+sendTo (UDP fd) p = C.sendAllTo fd (Builder.encodePacket_strict p)
 
 -- | Recv variant to collect message source address.
 recvFrom :: UDP -> IO (Packet.Packet, N.SockAddr)
diff --git a/Sound/OSC/Transport/Monad.hs b/Sound/OSC/Transport/Monad.hs
--- a/Sound/OSC/Transport/Monad.hs
+++ b/Sound/OSC/Transport/Monad.hs
@@ -68,11 +68,11 @@
 
 -- | Variant of 'recvPacket' that runs 'packet_to_bundle'.
 recvBundle :: (RecvOSC m) => m Packet.Bundle
-recvBundle = liftM Packet.packet_to_bundle recvPacket
+recvBundle = fmap Packet.packet_to_bundle recvPacket
 
 -- | Variant of 'recvPacket' that runs 'packet_to_message'.
 recvMessage :: (RecvOSC m) => m (Maybe Packet.Message)
-recvMessage = liftM Packet.packet_to_message recvPacket
+recvMessage = fmap Packet.packet_to_message recvPacket
 
 -- | Erroring variant.
 recvMessage_err :: RecvOSC m => m Packet.Message
@@ -80,7 +80,7 @@
 
 -- | Variant of 'recvPacket' that runs 'packetMessages'.
 recvMessages :: (RecvOSC m) => m [Packet.Message]
-recvMessages = liftM Packet.packetMessages recvPacket
+recvMessages = fmap Packet.packetMessages recvPacket
 
 -- * Wait
 
@@ -116,8 +116,8 @@
     let f = fromMaybe (error "waitReply: message not located?") .
             find (Packet.message_has_address s) .
             Packet.packetMessages
-    in liftM f (waitAddress s)
+    in fmap f (waitAddress s)
 
 -- | Variant of 'waitReply' that runs 'messageDatum'.
 waitDatum :: RecvOSC m => Packet.Address_Pattern -> m [Datum.Datum]
-waitDatum = liftM Packet.messageDatum . waitReply
+waitDatum = fmap Packet.messageDatum . waitReply
diff --git a/contrib/LICENSE b/contrib/LICENSE
new file mode 100644
--- /dev/null
+++ b/contrib/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
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+                     END OF TERMS AND CONDITIONS
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+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/hosc.cabal b/hosc.cabal
--- a/hosc.cabal
+++ b/hosc.cabal
@@ -1,21 +1,22 @@
 Name:              hosc
-Version:           0.18.1
+Version:           0.19
 Synopsis:          Haskell Open Sound Control
 Description:       @hosc@ implements a subset of the Open Sound Control
                    byte protocol, <http://opensoundcontrol.org/>.
                    .
                    See "Sound.OSC.Core" or "Sound.OSC" or "Sound.OSC.FD".
 License:           GPL-3
+License-File:      contrib/LICENSE
 Category:          Sound
-Copyright:         (c) Rohan Drape, Stefan Kersten and others, 2007-2020
+Copyright:         (c) Rohan Drape, Stefan Kersten and others, 2007-2021
 Author:            Rohan Drape, Stefan Kersten
 Maintainer:        rd@rohandrape.net
 Stability:         Experimental
 Homepage:          http://rohandrape.net/t/hosc
-Tested-With:       GHC == 8.6.5
+Tested-With:       GHC == 8.8.4
 Build-Type:        Simple
 Cabal-Version:     >= 1.10
-Data-Files:        README
+Data-Files:        README.md
 
 Library
   Build-Depends:   base >= 4.8 && < 5,
@@ -28,8 +29,6 @@
                    transformers
   Default-Language:Haskell2010
   GHC-Options:     -Wall -fwarn-tabs
-  if impl(ghc < 8.4)
-    cpp-options: -DIMPORT_SEMIGROUP
   Exposed-modules: Sound.OSC
                    Sound.OSC.Coding.Byte
                    Sound.OSC.Coding.Cast
@@ -51,4 +50,4 @@
 
 Source-Repository  head
   Type:            git
-  Location:        https://github.com/rd--/hosc.git
+  Location:        https://gitlab.com/rd--/hosc
