version 0.6.1HEAD0.6.1master

21 files changed, 5938 insertions, 349 deletions

diff --git a/Changelog.md b/Changelog.md
index 1721c8b..1624afc 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,15 @@
+## 0.6.1
+
+### Bug Fixes
+
+* Fix a bug that caused `maxThreads` directive to be ignored when rate control
+  was not used.
+
+### Enhancements
+
+* Add GHCJS support
+* Remove dependency on "clock" package
+
 ## 0.6.0
 
 ### Breaking changes
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
index 0000000..54f57d6
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,6 @@
+module Main (main) where
+
+import Distribution.Simple
+
+main :: IO ()
+main = defaultMainWithHooks autoconfUserHooks
diff --git a/configure b/configure
new file mode 100755
index 0000000..660e8cc
--- /dev/null
+++ b/configure
@@ -0,0 +1,4331 @@
+#! /bin/sh
+# Guess values for system-dependent variables and create Makefiles.
+# Generated by GNU Autoconf 2.69 for streamly 0.6.0.
+#
+# Report bugs to <harendra.kumar@gmail.com>.
+#
+#
+# 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: harendra.kumar@gmail.com about your system, including
+$0: any error possibly output before this message. Then
+$0: install a modern shell, or manually run the script
+$0: under such a shell if you do have one."
+  fi
+  exit 1
+fi
+fi
+fi
+SHELL=${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='streamly'
+PACKAGE_TARNAME='streamly'
+PACKAGE_VERSION='0.6.0'
+PACKAGE_STRING='streamly 0.6.0'
+PACKAGE_BUGREPORT='harendra.kumar@gmail.com'
+PACKAGE_URL=''
+
+# 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"
+
+ac_subst_vars='LTLIBOBJS
+LIBOBJS
+EGREP
+GREP
+CPP
+OBJEXT
+EXEEXT
+ac_ct_CC
+CPPFLAGS
+LDFLAGS
+CFLAGS
+CC
+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
+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_compiler
+'
+      ac_precious_vars='build_alias
+host_alias
+target_alias
+CC
+CFLAGS
+LDFLAGS
+LIBS
+CPPFLAGS
+CPP'
+
+
+# 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'
+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
+
+  # Accept the important Cygnus configure options, so we can diagnose typos.
+
+  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=`$as_echo "$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=`$as_echo "$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=$ac_optarg ;;
+
+  -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+  | -silent | --silent | --silen | --sile | --sil)
+    silent=yes ;;
+
+  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
+    ac_prev=sbindir ;;
+  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
+  | --sbi=* | --sb=*)
+    sbindir=$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=`$as_echo "$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=`$as_echo "$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.
+    $as_echo "$as_me: WARNING: you should use --build, --host, --target" >&2
+    expr "x$ac_option" : ".*[^-._$as_cr_alnum]" >/dev/null &&
+      $as_echo "$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" ;;
+    *)     $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2 ;;
+  esac
+fi
+
+# Check all directory arguments for consistency.
+for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
+		datadir sysconfdir sharedstatedir localstatedir includedir \
+		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
+		libdir localedir mandir
+do
+  eval ac_val=\$$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 ||
+$as_echo X"$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 streamly 0.6.0 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 \`$ac_default_prefix' using \`--prefix',
+for instance \`--prefix=\$HOME'.
+
+For better control, use the options below.
+
+Fine tuning of the installation directories:
+  --bindir=DIR            user executables [EPREFIX/bin]
+  --sbindir=DIR           system admin executables [EPREFIX/sbin]
+  --libexecdir=DIR        program executables [EPREFIX/libexec]
+  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
+  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
+  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --libdir=DIR            object code libraries [EPREFIX/lib]
+  --includedir=DIR        C header files [PREFIX/include]
+  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
+  --datarootdir=DIR       read-only arch.-independent data root [PREFIX/share]
+  --datadir=DIR           read-only architecture-independent data [DATAROOTDIR]
+  --infodir=DIR           info documentation [DATAROOTDIR/info]
+  --localedir=DIR         locale-dependent data [DATAROOTDIR/locale]
+  --mandir=DIR            man documentation [DATAROOTDIR/man]
+  --docdir=DIR            documentation root [DATAROOTDIR/doc/streamly]
+  --htmldir=DIR           html documentation [DOCDIR]
+  --dvidir=DIR            dvi documentation [DOCDIR]
+  --pdfdir=DIR            pdf documentation [DOCDIR]
+  --psdir=DIR             ps documentation [DOCDIR]
+_ACEOF
+
+  cat <<\_ACEOF
+_ACEOF
+fi
+
+if test -n "$ac_init_help"; then
+  case $ac_init_help in
+     short | recursive ) echo "Configuration of streamly 0.6.0:";;
+   esac
+  cat <<\_ACEOF
+
+Optional Packages:
+  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
+  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
+GHC
+
+Some influential environment variables:
+  CC          C compiler command
+  CFLAGS      C compiler flags
+  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
+              nonstandard directory <lib dir>
+  LIBS        libraries to pass to the linker, e.g. -l<library>
+  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+  CPP         C preprocessor
+
+Use these variables to override the choices made by `configure' or to help
+it to find libraries and programs with nonstandard names/locations.
+
+Report bugs to <harendra.kumar@gmail.com>.
+_ACEOF
+ac_status=$?
+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=/`$as_echo "$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
+
+    cd "$ac_dir" || { ac_status=$?; continue; }
+    # Check for guested configure.
+    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
+      $as_echo "$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 $ac_init_version; then
+  cat <<\_ACEOF
+streamly configure 0.6.0
+generated by GNU Autoconf 2.69
+
+Copyright (C) 2012 Free Software Foundation, Inc.
+This configure script is free software; the Free Software Foundation
+gives unlimited permission to copy, distribute and modify it.
+_ACEOF
+  exit
+fi
+
+## ------------------------ ##
+## Autoconf initialization. ##
+## ------------------------ ##
+
+# ac_fn_c_try_compile LINENO
+# --------------------------
+# Try to compile conftest.$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.$ac_objext
+  if { { ac_try="$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$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
+  $as_echo "$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
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_compile
+
+# ac_fn_c_try_cpp LINENO
+# ----------------------
+# Try to preprocess conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_cpp ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if { { ac_try="$ac_cpp conftest.$ac_ext"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } > conftest.i && {
+	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+    ac_retval=1
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_cpp
+
+# ac_fn_c_check_header_mongrel LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists, giving a warning if it cannot be compiled using
+# the include files in INCLUDES and setting the cache variable VAR
+# accordingly.
+ac_fn_c_check_header_mongrel ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  if eval \${$3+:} false; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+else
+  # Is the header compilable?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 usability" >&5
+$as_echo_n "checking $2 usability... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_header_compiler=yes
+else
+  ac_header_compiler=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_compiler" >&5
+$as_echo "$ac_header_compiler" >&6; }
+
+# Is the header present?
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking $2 presence" >&5
+$as_echo_n "checking $2 presence... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <$2>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  ac_header_preproc=yes
+else
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_header_preproc" >&5
+$as_echo "$ac_header_preproc" >&6; }
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in #((
+  yes:no: )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&5
+$as_echo "$as_me: WARNING: $2: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+    ;;
+  no:yes:* )
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: present but cannot be compiled" >&5
+$as_echo "$as_me: WARNING: $2: present but cannot be compiled" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     check for missing prerequisite headers?" >&5
+$as_echo "$as_me: WARNING: $2:     check for missing prerequisite headers?" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: see the Autoconf documentation" >&5
+$as_echo "$as_me: WARNING: $2: see the Autoconf documentation" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&5
+$as_echo "$as_me: WARNING: $2:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: $2: proceeding with the compiler's result" >&5
+$as_echo "$as_me: WARNING: $2: proceeding with the compiler's result" >&2;}
+( $as_echo "## --------------------------------------- ##
+## Report this to harendra.kumar@gmail.com ##
+## --------------------------------------- ##"
+     ) | sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  eval "$3=\$ac_header_compiler"
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+fi
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_mongrel
+
+# ac_fn_c_try_run LINENO
+# ----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
+# that executables *can* be run.
+ac_fn_c_try_run ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && { ac_try='./conftest$ac_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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: program exited with status $ac_status" >&5
+       $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+       ac_retval=$ac_status
+fi
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+  as_fn_set_status $ac_retval
+
+} # ac_fn_c_try_run
+
+# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
+# -------------------------------------------------------
+# Tests whether HEADER exists and can be compiled using the include files in
+# INCLUDES, setting the cache variable VAR accordingly.
+ac_fn_c_check_header_compile ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+#include <$2>
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_header_compile
+
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$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.$ac_objext conftest$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$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
+  $as_echo "$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
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1
+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
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$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 (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#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 ();
+/* 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 ()
+{
+return $2 ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_func
+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 streamly $as_me 0.6.0, which was
+generated by GNU Autoconf 2.69.  Invocation command line was
+
+  $ $0 $@
+
+_ACEOF
+exec 5>>config.log
+{
+cat <<_ASUNAME
+## --------- ##
+## Platform. ##
+## --------- ##
+
+hostname = `(hostname || uname -n) 2>/dev/null | sed 1q`
+uname -m = `(uname -m) 2>/dev/null || echo unknown`
+uname -r = `(uname -r) 2>/dev/null || echo unknown`
+uname -s = `(uname -s) 2>/dev/null || echo unknown`
+uname -v = `(uname -v) 2>/dev/null || echo unknown`
+
+/usr/bin/uname -p = `(/usr/bin/uname -p) 2>/dev/null || echo unknown`
+/bin/uname -X     = `(/bin/uname -X) 2>/dev/null     || echo unknown`
+
+/bin/arch              = `(/bin/arch) 2>/dev/null              || echo unknown`
+/usr/bin/arch -k       = `(/usr/bin/arch -k) 2>/dev/null       || echo unknown`
+/usr/convex/getsysinfo = `(/usr/convex/getsysinfo) 2>/dev/null || echo unknown`
+/usr/bin/hostinfo      = `(/usr/bin/hostinfo) 2>/dev/null      || echo unknown`
+/bin/machine           = `(/bin/machine) 2>/dev/null           || echo unknown`
+/usr/bin/oslevel       = `(/usr/bin/oslevel) 2>/dev/null       || echo unknown`
+/bin/universe          = `(/bin/universe) 2>/dev/null          || echo unknown`
+
+_ASUNAME
+
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    $as_echo "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 $ac_arg in
+    -no-create | --no-c* | -n | -no-recursion | --no-r*) continue ;;
+    -q | -quiet | --quiet | --quie | --qui | --qu | --q \
+    | -silent | --silent | --silen | --sile | --sil)
+      continue ;;
+    *\'*)
+      ac_arg=`$as_echo "$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 " '$ac_arg'"
+      ;;
+    esac
+  done
+done
+{ ac_configure_args0=; unset ac_configure_args0;}
+{ ac_configure_args1=; unset ac_configure_args1;}
+
+# When interrupted or exit'd, cleanup temporary files, and complete
+# config.log.  We remove comments because anyway the quotes in there
+# would cause problems or look ugly.
+# WARNING: Use '\'' to represent an apostrophe within the trap.
+# WARNING: Do not start the trap code with a newline, due to a FreeBSD 4.0 bug.
+trap 'exit_status=$?
+  # Save into config.log some information that might help in debugging.
+  {
+    echo
+
+    $as_echo "## ---------------- ##
+## 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_*) { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+$as_echo "$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
+
+    $as_echo "## ----------------- ##
+## Output variables. ##
+## ----------------- ##"
+    echo
+    for ac_var in $ac_subst_vars
+    do
+      eval ac_val=\$$ac_var
+      case $ac_val in
+      *\'\''*) ac_val=`$as_echo "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+      esac
+      $as_echo "$ac_var='\''$ac_val'\''"
+    done | sort
+    echo
+
+    if test -n "$ac_subst_files"; then
+      $as_echo "## ------------------- ##
+## File substitutions. ##
+## ------------------- ##"
+      echo
+      for ac_var in $ac_subst_files
+      do
+	eval ac_val=\$$ac_var
+	case $ac_val in
+	*\'\''*) ac_val=`$as_echo "$ac_val" | sed "s/'\''/'\''\\\\\\\\'\'''\''/g"`;;
+	esac
+	$as_echo "$ac_var='\''$ac_val'\''"
+      done | sort
+      echo
+    fi
+
+    if test -s confdefs.h; then
+      $as_echo "## ----------- ##
+## confdefs.h. ##
+## ----------- ##"
+      echo
+      cat confdefs.h
+      echo
+    fi
+    test "$ac_signal" != 0 &&
+      $as_echo "$as_me: caught signal $ac_signal"
+    $as_echo "$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' $ac_signal
+done
+ac_signal=0
+
+# confdefs.h avoids OS command line length limits that DEFS can exceed.
+rm -f -r conftest* confdefs.h
+
+$as_echo "/* confdefs.h */" > confdefs.h
+
+# Predefined preprocessor variables.
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_NAME "$PACKAGE_NAME"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_TARNAME "$PACKAGE_TARNAME"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_VERSION "$PACKAGE_VERSION"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_STRING "$PACKAGE_STRING"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_BUGREPORT "$PACKAGE_BUGREPORT"
+_ACEOF
+
+cat >>confdefs.h <<_ACEOF
+#define PACKAGE_URL "$PACKAGE_URL"
+_ACEOF
+
+
+# Let the site file select an alternate cache file if it wants to.
+# Prefer an explicitly selected file to automatically selected ones.
+ac_site_file1=NONE
+ac_site_file2=NONE
+if test -n "$CONFIG_SITE"; then
+  # We do not want a PATH search for config.site.
+  case $CONFIG_SITE in #((
+    -*)  ac_site_file1=./$CONFIG_SITE;;
+    */*) ac_site_file1=$CONFIG_SITE;;
+    *)   ac_site_file1=./$CONFIG_SITE;;
+  esac
+elif test "x$prefix" != xNONE; then
+  ac_site_file1=$prefix/share/config.site
+  ac_site_file2=$prefix/etc/config.site
+else
+  ac_site_file1=$ac_default_prefix/share/config.site
+  ac_site_file2=$ac_default_prefix/etc/config.site
+fi
+for ac_site_file in "$ac_site_file1" "$ac_site_file2"
+do
+  test "x$ac_site_file" = xNONE && continue
+  if test /dev/null != "$ac_site_file" && test -r "$ac_site_file"; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: loading site script $ac_site_file" >&5
+$as_echo "$as_me: loading site script $ac_site_file" >&6;}
+    sed 's/^/| /' "$ac_site_file" >&5
+    . "$ac_site_file" \
+      || { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$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
+    { $as_echo "$as_me:${as_lineno-$LINENO}: loading cache $cache_file" >&5
+$as_echo "$as_me: loading cache $cache_file" >&6;}
+    case $cache_file in
+      [\\/]* | ?:[\\/]* ) . "$cache_file";;
+      *)                      . "./$cache_file";;
+    esac
+  fi
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: creating cache $cache_file" >&5
+$as_echo "$as_me: creating cache $cache_file" >&6;}
+  >$cache_file
+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,)
+      { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&5
+$as_echo "$as_me: error: \`$ac_var' was set to \`$ac_old_val' in the previous run" >&2;}
+      ac_cache_corrupted=: ;;
+    ,set)
+      { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' was not set in the previous run" >&5
+$as_echo "$as_me: error: \`$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
+	  { $as_echo "$as_me:${as_lineno-$LINENO}: error: \`$ac_var' has changed since the previous run:" >&5
+$as_echo "$as_me: error: \`$ac_var' has changed since the previous run:" >&2;}
+	  ac_cache_corrupted=:
+	else
+	  { $as_echo "$as_me:${as_lineno-$LINENO}: warning: ignoring whitespace changes in \`$ac_var' since the previous run:" >&5
+$as_echo "$as_me: warning: ignoring whitespace changes in \`$ac_var' since the previous run:" >&2;}
+	  eval $ac_var=\$ac_old_val
+	fi
+	{ $as_echo "$as_me:${as_lineno-$LINENO}:   former value:  \`$ac_old_val'" >&5
+$as_echo "$as_me:   former value:  \`$ac_old_val'" >&2;}
+	{ $as_echo "$as_me:${as_lineno-$LINENO}:   current value: \`$ac_new_val'" >&5
+$as_echo "$as_me:   current value: \`$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=`$as_echo "$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
+  { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+  { $as_echo "$as_me:${as_lineno-$LINENO}: error: changes in the environment can compromise the build" >&5
+$as_echo "$as_me: error: changes in the environment can compromise the build" >&2;}
+  as_fn_error $? "run \`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
+
+
+
+# To suppress "WARNING: unrecognized options: --with-compiler"
+
+# Check whether --with-compiler was given.
+if test "${with_compiler+set}" = set; then :
+  withval=$with_compiler;
+fi
+
+
+# Check headers and functions required
+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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  fi
+fi
+if test -z "$CC"; then
+  # Extract the first word of "cc", so it can be a program name with args.
+set dummy cc; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$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+' '}$@"
+  fi
+fi
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+fi
+if test -z "$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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+CC=$ac_cv_prog_CC
+if test -n "$CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CC" >&5
+$as_echo "$CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+    test -n "$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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_prog_ac_ct_CC+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -n "$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
+  test -z "$as_dir" && as_dir=.
+    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"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+ac_ct_CC=$ac_cv_prog_ac_ct_CC
+if test -n "$ac_ct_CC"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_ct_CC" >&5
+$as_echo "$ac_ct_CC" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$ac_ct_CC" && break
+done
+
+  if test "x$ac_ct_CC" = x; then
+    CC=""
+  else
+    case $cross_compiling:$ac_tool_warned in
+yes:)
+{ $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: using cross tools not prefixed with host triplet" >&5
+$as_echo "$as_me: WARNING: using cross tools not prefixed with host triplet" >&2;}
+ac_tool_warned=yes ;;
+esac
+    CC=$ac_ct_CC
+  fi
+fi
+
+fi
+
+
+test -z "$CC" && { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$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.
+$as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler version" >&5
+set X $ac_compile
+ac_compiler=$2
+for ac_option in --version -v -V -qversion; do
+  { { ac_try="$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$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
+  $as_echo "$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 ()
+{
+
+  ;
+  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.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the C compiler works" >&5
+$as_echo_n "checking whether the C compiler works... " >&6; }
+ac_link_default=`$as_echo "$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link_default") 2>&5
+  ac_status=$?
+  $as_echo "$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 "${ac_cv_exeext+set}" = set && test "$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 "$ac_cv_exeext" = no && ac_cv_exeext=
+
+else
+  ac_file=''
+fi
+if test -z "$ac_file"; then :
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+$as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 77 "C compiler cannot create executables
+See \`config.log' for more details" "$LINENO" 5; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for C compiler default output file name" >&5
+$as_echo_n "checking for C compiler default output file name... " >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_file" >&5
+$as_echo "$ac_file" >&6; }
+ac_exeext=$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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of executables" >&5
+$as_echo_n "checking for suffix of executables... " >&6; }
+if { { ac_try="$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$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
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of executables: cannot compile and link
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+rm -f conftest conftest$ac_cv_exeext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_exeext" >&5
+$as_echo "$ac_cv_exeext" >&6; }
+
+rm -f conftest.$ac_ext
+EXEEXT=$ac_cv_exeext
+ac_exeext=$EXEEXT
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdio.h>
+int
+main ()
+{
+FILE *f = fopen ("conftest.out", "w");
+ return ferror (f) || fclose (f) != 0;
+
+  ;
+  return 0;
+}
+_ACEOF
+ac_clean_files="$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.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are cross compiling" >&5
+$as_echo_n "checking whether we are cross compiling... " >&6; }
+if test "$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>&5
+  ac_status=$?
+  $as_echo "$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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  $as_echo "$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
+	{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot run C compiled programs.
+If you meant to cross compile, use \`--host'.
+See \`config.log' for more details" "$LINENO" 5; }
+    fi
+  fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $cross_compiling" >&5
+$as_echo "$cross_compiling" >&6; }
+
+rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
+ac_clean_files=$ac_clean_files_save
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for suffix of object files" >&5
+$as_echo_n "checking for suffix of object files... " >&6; }
+if ${ac_cv_objext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  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}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_compile") 2>&5
+  ac_status=$?
+  $as_echo "$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
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "cannot compute suffix of object files: cannot compile
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+rm -f conftest.$ac_cv_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_objext" >&5
+$as_echo "$ac_cv_objext" >&6; }
+OBJEXT=$ac_cv_objext
+ac_objext=$OBJEXT
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we are using the GNU C compiler" >&5
+$as_echo_n "checking whether we are using the GNU C compiler... " >&6; }
+if ${ac_cv_c_compiler_gnu+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+#ifndef __GNUC__
+       choke me
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_compiler_gnu=yes
+else
+  ac_compiler_gnu=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ac_cv_c_compiler_gnu=$ac_compiler_gnu
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_c_compiler_gnu" >&5
+$as_echo "$ac_cv_c_compiler_gnu" >&6; }
+if test $ac_compiler_gnu = yes; then
+  GCC=yes
+else
+  GCC=
+fi
+ac_test_CFLAGS=${CFLAGS+set}
+ac_save_CFLAGS=$CFLAGS
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC accepts -g" >&5
+$as_echo_n "checking whether $CC accepts -g... " >&6; }
+if ${ac_cv_prog_cc_g+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_save_c_werror_flag=$ac_c_werror_flag
+   ac_c_werror_flag=yes
+   ac_cv_prog_cc_g=no
+   CFLAGS="-g"
+   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_prog_cc_g=yes
+else
+  CFLAGS=""
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  ac_c_werror_flag=$ac_save_c_werror_flag
+	 CFLAGS="-g"
+	 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  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.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+   ac_c_werror_flag=$ac_save_c_werror_flag
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_g" >&5
+$as_echo "$ac_cv_prog_cc_g" >&6; }
+if test "$ac_test_CFLAGS" = set; 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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to accept ISO C89" >&5
+$as_echo_n "checking for $CC option to accept ISO C89... " >&6; }
+if ${ac_cv_prog_cc_c89+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_prog_cc_c89=no
+ac_save_CC=$CC
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdarg.h>
+#include <stdio.h>
+struct stat;
+/* Most of the following tests are stolen from RCS 5.7's src/conf.sh.  */
+struct buf { int x; };
+FILE * (*rcsopen) (struct buf *, struct stat *, int);
+static char *e (p, i)
+     char **p;
+     int i;
+{
+  return p[i];
+}
+static char *f (char * (*g) (char **, int), char **p, ...)
+{
+  char *s;
+  va_list v;
+  va_start (v,p);
+  s = g (p, va_arg (v,int));
+  va_end (v);
+  return s;
+}
+
+/* OSF 4.0 Compaq cc is some sort of almost-ANSI by default.  It has
+   function prototypes and stuff, but not '\xHH' hex character constants.
+   These don't provoke an error unfortunately, instead are silently treated
+   as 'x'.  The following induces an error, until -std is added to get
+   proper ANSI mode.  Curiously '\x00'!='x' always comes out true, for an
+   array size at least.  It's necessary to write '\x00'==0 to get something
+   that's true only with -std.  */
+int osf4_cc_array ['\x00' == 0 ? 1 : -1];
+
+/* IBM C 6 for AIX is almost-ANSI by default, but it replaces macro parameters
+   inside strings and character constants.  */
+#define FOO(x) 'x'
+int xlc6_cc_array[FOO(a) == 'x' ? 1 : -1];
+
+int test (int i, double x);
+struct s1 {int (*f) (int a);};
+struct s2 {int (*f) (double a);};
+int pairnames (int, char **, FILE *(*)(struct buf *, struct stat *, int), int, int);
+int argc;
+char **argv;
+int
+main ()
+{
+return f (e, argv, 0) != argv[0]  ||  f (e, argv, 1) != argv[1];
+  ;
+  return 0;
+}
+_ACEOF
+for ac_arg in '' -qlanglvl=extc89 -qlanglvl=ansi -std \
+	-Ae "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
+do
+  CC="$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
+  test "x$ac_cv_prog_cc_c89" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+
+fi
+# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_c89" in
+  x)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: none needed" >&5
+$as_echo "none needed" >&6; } ;;
+  xno)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: unsupported" >&5
+$as_echo "unsupported" >&6; } ;;
+  *)
+    CC="$CC $ac_cv_prog_cc_c89"
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_cc_c89" >&5
+$as_echo "$ac_cv_prog_cc_c89" >&6; } ;;
+esac
+if test "x$ac_cv_prog_cc_c89" != xno; then :
+
+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
+
+
+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
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how to run the C preprocessor" >&5
+$as_echo_n "checking how to run the C preprocessor... " >&6; }
+# On Suns, sometimes $CPP names a directory.
+if test -n "$CPP" && test -d "$CPP"; then
+  CPP=
+fi
+if test -z "$CPP"; then
+  if ${ac_cv_prog_CPP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+      # Double quotes because CPP needs to be expanded
+    for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp"
+    do
+      ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.i conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+  break
+fi
+
+    done
+    ac_cv_prog_CPP=$CPP
+
+fi
+  CPP=$ac_cv_prog_CPP
+else
+  ac_cv_prog_CPP=$CPP
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $CPP" >&5
+$as_echo "$CPP" >&6; }
+ac_preproc_ok=false
+for ac_c_preproc_warn_flag in '' yes
+do
+  # Use a header file that comes with gcc, so configuring glibc
+  # with a fresh cross-compiler works.
+  # Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+  # <limits.h> exists even on freestanding compilers.
+  # On the NeXT, cc -E runs the code through the compiler's parser,
+  # not just through cpp. "Syntax error" is here to catch this case.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+		     Syntax error
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+
+else
+  # Broken: fails on valid input.
+continue
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+  # OK, works on sane cases.  Now check whether nonexistent headers
+  # can be detected and how.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ac_nonexistent.h>
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  # Broken: success on invalid input.
+continue
+else
+  # Passes both tests.
+ac_preproc_ok=:
+break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+
+done
+# Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped.
+rm -f conftest.i conftest.err conftest.$ac_ext
+if $ac_preproc_ok; then :
+
+else
+  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error $? "C preprocessor \"$CPP\" fails sanity check
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+
+ac_ext=c
+ac_cpp='$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
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for grep that handles long lines and -e" >&5
+$as_echo_n "checking for grep that handles long lines and -e... " >&6; }
+if ${ac_cv_path_GREP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -z "$GREP"; then
+  ac_path_GREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in grep ggrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_GREP="$as_dir/$ac_prog$ac_exec_ext"
+      as_fn_executable_p "$ac_path_GREP" || continue
+# Check for GNU ac_path_GREP and select it if it is found.
+  # Check for GNU $ac_path_GREP
+case `"$ac_path_GREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_GREP="$ac_path_GREP" ac_path_GREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'GREP' >> "conftest.nl"
+    "$ac_path_GREP" -e 'GREP$' -e '-(cannot match)-' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_GREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_GREP="$ac_path_GREP"
+      ac_path_GREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_GREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_GREP"; then
+    as_fn_error $? "no acceptable grep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_GREP=$GREP
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_GREP" >&5
+$as_echo "$ac_cv_path_GREP" >&6; }
+ GREP="$ac_cv_path_GREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for egrep" >&5
+$as_echo_n "checking for egrep... " >&6; }
+if ${ac_cv_path_EGREP+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if echo a | $GREP -E '(a|b)' >/dev/null 2>&1
+   then ac_cv_path_EGREP="$GREP -E"
+   else
+     if test -z "$EGREP"; then
+  ac_path_EGREP_found=false
+  # Loop through the user's path and test for each of PROGNAME-LIST
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH$PATH_SEPARATOR/usr/xpg4/bin
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_prog in egrep; do
+    for ac_exec_ext in '' $ac_executable_extensions; do
+      ac_path_EGREP="$as_dir/$ac_prog$ac_exec_ext"
+      as_fn_executable_p "$ac_path_EGREP" || continue
+# Check for GNU ac_path_EGREP and select it if it is found.
+  # Check for GNU $ac_path_EGREP
+case `"$ac_path_EGREP" --version 2>&1` in
+*GNU*)
+  ac_cv_path_EGREP="$ac_path_EGREP" ac_path_EGREP_found=:;;
+*)
+  ac_count=0
+  $as_echo_n 0123456789 >"conftest.in"
+  while :
+  do
+    cat "conftest.in" "conftest.in" >"conftest.tmp"
+    mv "conftest.tmp" "conftest.in"
+    cp "conftest.in" "conftest.nl"
+    $as_echo 'EGREP' >> "conftest.nl"
+    "$ac_path_EGREP" 'EGREP$' < "conftest.nl" >"conftest.out" 2>/dev/null || break
+    diff "conftest.out" "conftest.nl" >/dev/null 2>&1 || break
+    as_fn_arith $ac_count + 1 && ac_count=$as_val
+    if test $ac_count -gt ${ac_path_EGREP_max-0}; then
+      # Best one so far, save it but keep looking for a better one
+      ac_cv_path_EGREP="$ac_path_EGREP"
+      ac_path_EGREP_max=$ac_count
+    fi
+    # 10*(2^10) chars as input seems more than enough
+    test $ac_count -gt 10 && break
+  done
+  rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
+esac
+
+      $ac_path_EGREP_found && break 3
+    done
+  done
+  done
+IFS=$as_save_IFS
+  if test -z "$ac_cv_path_EGREP"; then
+    as_fn_error $? "no acceptable egrep could be found in $PATH$PATH_SEPARATOR/usr/xpg4/bin" "$LINENO" 5
+  fi
+else
+  ac_cv_path_EGREP=$EGREP
+fi
+
+   fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_path_EGREP" >&5
+$as_echo "$ac_cv_path_EGREP" >&6; }
+ EGREP="$ac_cv_path_EGREP"
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
+$as_echo_n "checking for ANSI C header files... " >&6; }
+if ${ac_cv_header_stdc+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <float.h>
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_header_stdc=yes
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+if test $ac_cv_header_stdc = yes; then
+  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <string.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "memchr" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+
+_ACEOF
+if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
+  $EGREP "free" >/dev/null 2>&1; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f conftest*
+
+fi
+
+if test $ac_cv_header_stdc = yes; then
+  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
+  if test "$cross_compiling" = yes; then :
+  :
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <ctype.h>
+#include <stdlib.h>
+#if ((' ' & 0x0FF) == 0x020)
+# define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
+# define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
+#else
+# define ISLOWER(c) \
+		   (('a' <= (c) && (c) <= 'i') \
+		     || ('j' <= (c) && (c) <= 'r') \
+		     || ('s' <= (c) && (c) <= 'z'))
+# define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c))
+#endif
+
+#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 256; i++)
+    if (XOR (islower (i), ISLOWER (i))
+	|| toupper (i) != TOUPPER (i))
+      return 2;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_run "$LINENO"; then :
+
+else
+  ac_cv_header_stdc=no
+fi
+rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+  conftest.$ac_objext conftest.beam conftest.$ac_ext
+fi
+
+fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_header_stdc" >&5
+$as_echo "$ac_cv_header_stdc" >&6; }
+if test $ac_cv_header_stdc = yes; then
+
+$as_echo "#define STDC_HEADERS 1" >>confdefs.h
+
+fi
+
+# On IRIX 5.3, sys/types and inttypes.h are conflicting.
+for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \
+		  inttypes.h stdint.h unistd.h
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_c_check_header_compile "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default
+"
+if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
+
+for ac_header in time.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "time.h" "ac_cv_header_time_h" "$ac_includes_default"
+if test "x$ac_cv_header_time_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_TIME_H 1
+_ACEOF
+
+fi
+
+done
+
+for ac_func in clock_gettime
+do :
+  ac_fn_c_check_func "$LINENO" "clock_gettime" "ac_cv_func_clock_gettime"
+if test "x$ac_cv_func_clock_gettime" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_CLOCK_GETTIME 1
+_ACEOF
+
+fi
+done
+
+
+# Output
+ac_config_headers="$ac_config_headers src/Streamly/Time/config.h"
+
+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_*) { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: cache variable $ac_var contains a newline" >&5
+$as_echo "$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+set}" = set || &/
+     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
+      { $as_echo "$as_me:${as_lineno-$LINENO}: updating cache $cache_file" >&5
+$as_echo "$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
+    { $as_echo "$as_me:${as_lineno-$LINENO}: not updating unwritable cache $cache_file" >&5
+$as_echo "$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$//'
+  ac_i=`$as_echo "$ac_i" | sed "$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"
+{ $as_echo "$as_me:${as_lineno-$LINENO}: creating $CONFIG_STATUS" >&5
+$as_echo "$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 >>$CONFIG_STATUS <<\_ASEOF || as_write_fail=1
+## -------------------- ##
+## M4sh Initialization. ##
+## -------------------- ##
+
+# Be more Bourne compatible
+DUALCASE=1; export DUALCASE # for MKS sh
+if test -n "${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
+
+
+# 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 streamly $as_me 0.6.0, 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 <harendra.kumar@gmail.com>."
+
+_ACEOF
+cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
+ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
+ac_cs_version="\\
+streamly config.status 0.6.0
+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 $ac_config_target in
+    "src/Streamly/Time/config.h") CONFIG_HEADERS="$CONFIG_HEADERS src/Streamly/Time/config.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"
+
+
+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 $ac_f in *\'*) ac_f=`$as_echo "$ac_f" | sed "s/'/'\\\\\\\\''/g"`;; esac
+      as_fn_append ac_file_inputs " '$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 '`
+	  $as_echo "$*" | sed 's|^[^:]*/||;s|:[^:]*/|, |g'
+	`' by configure.'
+    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 "$configure_input" |
+       sed 's/[\\\\&|]/\\\\&/g'`;; #(
+    *) ac_sed_conf_input=$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 ||
+$as_echo X"$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
+
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..a8f51af
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,17 @@
+# Input file for autoconf to generate the configure script.
+
+# See https://www.gnu.org/software/autoconf/manual/autoconf.html for help on
+# the macros used in this file.
+
+AC_INIT([streamly], [0.6.0], [harendra.kumar@gmail.com], [streamly])
+
+# To suppress "WARNING: unrecognized options: --with-compiler"
+AC_ARG_WITH([compiler], [GHC])
+
+# Check headers and functions required
+AC_CHECK_HEADERS([time.h])
+AC_CHECK_FUNCS([clock_gettime])
+
+# Output
+AC_CONFIG_HEADERS([src/Streamly/Time/config.h])
+AC_OUTPUT
diff --git a/examples/AcidRain.hs b/examples/AcidRain.hs
index b39c9ce..aa52383 100644
--- a/examples/AcidRain.hs
+++ b/examples/AcidRain.hs
@@ -5,9 +5,9 @@
 
 import Streamly
 import Streamly.Prelude as S
-import Control.Monad (void, when)
+import Control.Monad (void)
 import Control.Monad.IO.Class (MonadIO(liftIO))
-import Control.Monad.State (MonadState, get, modify, runStateT, put)
+import Control.Monad.State (MonadState, get, modify, runStateT)
 
 data Event = Quit | Harm Int | Heal Int deriving (Show)
 
diff --git a/jsbits/clock.js b/jsbits/clock.js
new file mode 100644
index 0000000..b81f09d
--- /dev/null
+++ b/jsbits/clock.js
@@ -0,0 +1,31 @@
+function h$clock_gettime_js(when, p_d, p_o) {
+  /* XXX: guess if we have to write 64 bit values:
+
+            alloca is often used and will give us 16 bytes
+            if timespec contains two 64 bit values
+
+          but we really should fix this by not having hsc2hs values
+          from the build system leak here
+   */
+  var is64 = p_d.i3.length == 4 && p_o == 0;
+  var o  = p_o >> 2,
+      t  = Date.now ? Date.now() : new Date().getTime(),
+      tf = Math.floor(t / 1000),
+      tn = 1000000 * (t - (1000 * tf));
+  if(is64) {
+    p_d.i3[o]   = tf|0;
+    p_d.i3[o+1] = 0;
+    p_d.i3[o+2] = tn|0;
+    p_d.i3[o+3] = 0;
+  } else {
+    p_d.i3[o]   = tf|0;
+    p_d.i3[o+1] = tn|0;
+  }
+  return 0;
+}
+/* Hack! Supporting code for "clock" package
+ * "hspec" depends on clock.
+ */
+function h$hs_clock_darwin_gettime(when, p_d, p_o) {
+      h$clock_gettime_js(when, p_d, p_o);
+}
diff --git a/src/Streamly/Atomics.hs b/src/Streamly/Atomics.hs
new file mode 100644
index 0000000..8d0656f
--- /dev/null
+++ b/src/Streamly/Atomics.hs
@@ -0,0 +1,82 @@
+{-# LANGUAGE CPP    #-}
+
+-- |
+-- Module      : Streamly.Atomics
+-- Copyright   : (c) 2018-2019 Composewell Technologies
+--
+-- License     : BSD3
+-- Maintainer  : harendra.kumar@gmail.com
+-- Stability   : experimental
+-- Portability : GHC
+
+module Streamly.Atomics
+    (
+      atomicModifyIORefCAS
+    , atomicModifyIORefCAS_
+    , writeBarrier
+    , storeLoadBarrier
+    )
+where
+
+import Data.IORef (IORef, atomicModifyIORef)
+#ifdef ghcjs_HOST_OS
+import Data.IORef (modifyIORef)
+#else
+import qualified Data.Atomics as A
+#endif
+
+#ifndef ghcjs_HOST_OS
+
+-- XXX Does it make sense to have replacements for atomicModifyIORef etc. on a
+-- single threaded system.
+--
+-- Slightly faster version of CAS. Gained some improvement by avoiding the use
+-- of "evaluate" because we know we do not have exceptions in fn.
+{-# INLINE atomicModifyIORefCAS #-}
+atomicModifyIORefCAS :: IORef a -> (a -> (a,b)) -> IO b
+atomicModifyIORefCAS ref fn = do
+    tkt <- A.readForCAS ref
+    loop tkt retries
+
+    where
+
+    retries = 25 :: Int
+    loop _   0     = atomicModifyIORef ref fn
+    loop old tries = do
+        let (new, result) = fn $ A.peekTicket old
+        (success, tkt) <- A.casIORef ref old new
+        if success
+        then return result
+        else loop tkt (tries - 1)
+
+{-# INLINE atomicModifyIORefCAS_ #-}
+atomicModifyIORefCAS_ :: IORef t -> (t -> t) -> IO ()
+atomicModifyIORefCAS_ = A.atomicModifyIORefCAS_
+
+{-# INLINE writeBarrier #-}
+writeBarrier :: IO ()
+writeBarrier = A.writeBarrier
+
+{-# INLINE storeLoadBarrier #-}
+storeLoadBarrier :: IO ()
+storeLoadBarrier = A.storeLoadBarrier
+
+#else
+
+{-# INLINE atomicModifyIORefCAS #-}
+atomicModifyIORefCAS :: IORef a -> (a -> (a,b)) -> IO b
+atomicModifyIORefCAS = atomicModifyIORef
+
+{-# INLINE atomicModifyIORefCAS_ #-}
+atomicModifyIORefCAS_ :: IORef a -> (a -> a) -> IO ()
+atomicModifyIORefCAS_ = modifyIORef
+
+{-# INLINE writeBarrier #-}
+writeBarrier :: IO ()
+writeBarrier = return ()
+
+{-# INLINE storeLoadBarrier #-}
+storeLoadBarrier :: IO ()
+storeLoadBarrier = return ()
+
+#endif
diff --git a/src/Streamly/SVar.hs b/src/Streamly/SVar.hs
index 0903806..674e489 100644
--- a/src/Streamly/SVar.hs
+++ b/src/Streamly/SVar.hs
@@ -53,7 +53,6 @@ module Streamly.SVar
     , captureMonadState
     , RunInIO (..)
 
-    , atomicModifyIORefCAS
     , WorkerInfo (..)
     , YieldRateInfo (..)
     , ThreadAbort (..)
@@ -100,7 +99,6 @@ module Streamly.SVar
 
     , toStreamVar
     , SVarStats (..)
-    , NanoSecs (..)
     , dumpSVar
     )
 where
@@ -117,9 +115,9 @@ import Control.Monad (when)
 import Control.Monad.Catch (MonadThrow)
 import Control.Monad.IO.Class (MonadIO(..))
 import Control.Monad.Trans.Control (MonadBaseControl, control, StM)
-import Data.Atomics
-       (casIORef, readForCAS, peekTicket, atomicModifyIORefCAS_,
-        writeBarrier, storeLoadBarrier)
+import Streamly.Atomics
+       (atomicModifyIORefCAS, atomicModifyIORefCAS_, writeBarrier,
+        storeLoadBarrier)
 import Data.Concurrent.Queue.MichaelScott (LinkedQueue, pushL)
 import Data.Functor (void)
 import Data.Heap (Heap, Entry(..))
@@ -133,27 +131,15 @@ import Data.Set (Set)
 import GHC.Conc (ThreadId(..))
 import GHC.Exts
 import GHC.IO (IO(..))
-import System.Clock (TimeSpec, Clock(Monotonic), getTime, toNanoSecs)
+import Streamly.Time.Clock (Clock(..), getTime)
+import Streamly.Time.Units
+       (AbsTime, NanoSecond64(..), MicroSecond64(..), diffAbsTime64,
+        fromRelTime64, toRelTime64, showNanoSecond64, showRelTime64)
 import System.IO (hPutStrLn, stderr)
-import Text.Printf (printf)
 
 import qualified Data.Heap as H
 import qualified Data.Set                    as S
 
--- Always use signed arithmetic to avoid inadvertant overflows of signed values
--- on conversion when comparing unsigned quantities with signed.
-newtype NanoSecs = NanoSecs Int64
-    deriving ( Eq
-             , Read
-             , Show
-             , Enum
-             , Bounded
-             , Num
-             , Real
-             , Integral
-             , Ord
-             )
-
 newtype Count = Count Int64
     deriving ( Eq
              , Read
@@ -230,7 +216,7 @@ data WorkerInfo = WorkerInfo
     -- total number of yields by the worker till now
     , workerYieldCount    :: IORef Count
     -- yieldCount at start, timestamp
-    , workerLatencyStart  :: IORef (Count, TimeSpec)
+    , workerLatencyStart  :: IORef (Count, AbsTime)
     }
 
 
@@ -262,13 +248,13 @@ data Rate = Rate
     }
 
 data LatencyRange = LatencyRange
-    { minLatency :: NanoSecs
-    , maxLatency :: NanoSecs
+    { minLatency :: NanoSecond64
+    , maxLatency :: NanoSecond64
     } deriving Show
 
 -- Rate control.
 data YieldRateInfo = YieldRateInfo
-    { svarLatencyTarget    :: NanoSecs
+    { svarLatencyTarget    :: NanoSecond64
     , svarLatencyRange     :: LatencyRange
     , svarRateBuffer       :: Int
     , svarGainedLostYields :: IORef Count
@@ -279,11 +265,11 @@ data YieldRateInfo = YieldRateInfo
     -- rate. The idle time of workers is adjusted in this, so that we only
     -- account for the rate when the consumer actually demands data.
     -- XXX interval latency is enough, we can move this under diagnostics build
-    , svarAllTimeLatency :: IORef (Count, TimeSpec)
+    , svarAllTimeLatency :: IORef (Count, AbsTime)
 
     -- XXX Worker latency specified by the user to be used before the first
     -- actual measurement arrives. Not yet implemented
-    , workerBootstrapLatency :: Maybe NanoSecs
+    , workerBootstrapLatency :: Maybe NanoSecond64
 
     -- After how many yields the worker should update the latency information.
     -- If the latency is high, this count is kept lower and vice-versa.  XXX If
@@ -295,20 +281,23 @@ data YieldRateInfo = YieldRateInfo
 
     -- This is in progress latency stats maintained by the workers which we
     -- empty into workerCollectedLatency stats at certain intervals - whenever
-    -- we process the stream elements yielded in this period.
-    -- (yieldCount, timeTaken)
-    , workerPendingLatency   :: IORef (Count, NanoSecs)
+    -- we process the stream elements yielded in this period. The first count
+    -- is all yields, the second count is only those yields for which the
+    -- latency was measured to be non-zero (note that if the timer resolution
+    -- is low the measured latency may be zero e.g. on JS platform).
+    -- (allYieldCount, yieldCount, timeTaken)
+    , workerPendingLatency   :: IORef (Count, Count, NanoSecond64)
 
     -- This is the second level stat which is an accmulation from
     -- workerPendingLatency stats. We keep accumulating latencies in this
     -- bucket until we have stats for a sufficient period and then we reset it
     -- to start collecting for the next period and retain the computed average
     -- latency for the last period in workerMeasuredLatency.
-    -- (yieldCount, timeTaken)
-    , workerCollectedLatency :: IORef (Count, NanoSecs)
+    -- (allYieldCount, yieldCount, timeTaken)
+    , workerCollectedLatency :: IORef (Count, Count, NanoSecond64)
 
     -- Latency as measured by workers, aggregated for the last period.
-    , workerMeasuredLatency :: IORef NanoSecs
+    , workerMeasuredLatency :: IORef NanoSecond64
     }
 
 data SVarStats = SVarStats {
@@ -317,10 +306,10 @@ data SVarStats = SVarStats {
     , maxOutQSize      :: IORef Int
     , maxHeapSize      :: IORef Int
     , maxWorkQSize     :: IORef Int
-    , avgWorkerLatency :: IORef (Count, NanoSecs)
-    , minWorkerLatency :: IORef NanoSecs
-    , maxWorkerLatency :: IORef NanoSecs
-    , svarStopTime     :: IORef (Maybe TimeSpec)
+    , avgWorkerLatency :: IORef (Count, NanoSecond64)
+    , minWorkerLatency :: IORef NanoSecond64
+    , maxWorkerLatency :: IORef NanoSecond64
+    , svarStopTime     :: IORef (Maybe AbsTime)
 }
 
 data Limit = Unlimited | Limited Word deriving Show
@@ -393,7 +382,7 @@ data State t m a = State
     , _threadsHigh    :: Limit
     , _bufferHigh     :: Limit
     -- XXX these two can be collapsed into a single type
-    , _streamLatency  :: Maybe NanoSecs -- bootstrap latency
+    , _streamLatency  :: Maybe NanoSecond64 -- bootstrap latency
     , _maxStreamRate  :: Maybe Rate
     , _inspectMode    :: Bool
     }
@@ -505,7 +494,7 @@ setStreamLatency n st =
             else Just (fromIntegral n)
        }
 
-getStreamLatency :: State t m a -> Maybe NanoSecs
+getStreamLatency :: State t m a -> Maybe NanoSecond64
 getStreamLatency = _streamLatency
 
 setInspectMode :: State t m a -> State t m a
@@ -532,79 +521,133 @@ cleanupSVarFromWorker sv = do
           (S.toList workers \\ [self])
 
 -------------------------------------------------------------------------------
--- Dumping the SVar for debug/diag
+-- Worker latency data collection
 -------------------------------------------------------------------------------
 
--- | Convert a number of seconds to a string.  The string will consist
--- of four decimal places, followed by a short description of the time
--- units.
-secs :: Double -> String
-secs k
-    | k < 0      = '-' : secs (-k)
-    | k >= 1     = k        `with` "s"
-    | k >= 1e-3  = (k*1e3)  `with` "ms"
-#ifdef mingw32_HOST_OS
-    | k >= 1e-6  = (k*1e6)  `with` "us"
-#else
-    | k >= 1e-6  = (k*1e6)  `with` "μs"
-#endif
-    | k >= 1e-9  = (k*1e9)  `with` "ns"
-    | k >= 1e-12 = (k*1e12) `with` "ps"
-    | k >= 1e-15 = (k*1e15) `with` "fs"
-    | k >= 1e-18 = (k*1e18) `with` "as"
-    | otherwise  = printf "%g s" k
-     where with (t :: Double) (u :: String)
-               | t >= 1e9  = printf "%.4g %s" t u
-               | t >= 1e3  = printf "%.0f %s" t u
-               | t >= 1e2  = printf "%.1f %s" t u
-               | t >= 1e1  = printf "%.2f %s" t u
-               | otherwise = printf "%.3f %s" t u
-
--- XXX Code duplicated from collectLatency
-drainLatency :: SVar t m a -> YieldRateInfo -> IO (Count, TimeSpec, NanoSecs)
-drainLatency sv yinfo = do
+-- Every once in a while workers update the latencies and check the yield rate.
+-- They return if we are above the expected yield rate. If we check too often
+-- it may impact performance, if we check less often we may have a stale
+-- picture. We update every minThreadDelay but we translate that into a yield
+-- count based on latency so that the checking overhead is little.
+--
+-- XXX use a generation count to indicate that the value is updated. If the
+-- value is updated an existing worker must check it again on the next yield.
+-- Otherwise it is possible that we may keep updating it and because of the mod
+-- worker keeps skipping it.
+updateWorkerPollingInterval :: YieldRateInfo -> NanoSecond64 -> IO ()
+updateWorkerPollingInterval yinfo latency = do
+    let periodRef = workerPollingInterval yinfo
+        cnt = max 1 $ minThreadDelay `div` latency
+        period = min cnt (fromIntegral magicMaxBuffer)
+
+    writeIORef periodRef (fromIntegral period)
+
+{-# INLINE recordMinMaxLatency #-}
+recordMinMaxLatency :: SVar t m a -> NanoSecond64 -> IO ()
+recordMinMaxLatency sv new = do
+    let ss = svarStats sv
+    minLat <- readIORef (minWorkerLatency ss)
+    when (new < minLat || minLat == 0) $
+        writeIORef (minWorkerLatency ss) new
+
+    maxLat <- readIORef (maxWorkerLatency ss)
+    when (new > maxLat) $ writeIORef (maxWorkerLatency ss) new
+
+recordAvgLatency :: SVar t m a -> (Count, NanoSecond64) -> IO ()
+recordAvgLatency sv (count, time) = do
+    let ss = svarStats sv
+    modifyIORef (avgWorkerLatency ss) $
+        \(cnt, t) -> (cnt + count, t + time)
+
+-- Pour the pending latency stats into a collection bucket
+{-# INLINE collectWorkerPendingLatency #-}
+collectWorkerPendingLatency
+    :: IORef (Count, Count, NanoSecond64)
+    -> IORef (Count, Count, NanoSecond64)
+    -> IO (Count, Maybe (Count, NanoSecond64))
+collectWorkerPendingLatency cur col = do
+    (fcount, count, time) <- atomicModifyIORefCAS cur $ \v -> ((0,0,0), v)
+
+    (fcnt, cnt, t) <- readIORef col
+    let totalCount = fcnt + fcount
+        latCount   = cnt + count
+        latTime    = t + time
+    writeIORef col (totalCount, latCount, latTime)
+
+    assert (latCount == 0 || latTime /= 0) (return ())
+    let latPair =
+            if latCount > 0 && latTime > 0
+            then Just $ (latCount, latTime)
+            else Nothing
+    return (totalCount, latPair)
+
+{-# INLINE shouldUseCollectedBatch #-}
+shouldUseCollectedBatch
+    :: Count
+    -> NanoSecond64
+    -> NanoSecond64
+    -> NanoSecond64
+    -> Bool
+shouldUseCollectedBatch collectedYields collectedTime newLat prevLat =
+    let r = fromIntegral newLat / fromIntegral prevLat :: Double
+    in     (collectedYields > fromIntegral magicMaxBuffer)
+        || (collectedTime > minThreadDelay)
+        || (prevLat > 0 && (r > 2 || r < 0.5))
+        || (prevLat == 0)
+
+-- Returns a triple, (1) yield count since last collection, (2) the base time
+-- when we started counting, (3) average latency in the last measurement
+-- period. The former two are used for accurate measurement of the going rate
+-- whereas the average is used for future estimates e.g. how many workers
+-- should be maintained to maintain the rate.
+-- CAUTION! keep it in sync with getWorkerLatency
+collectLatency :: SVar t m a
+               -> YieldRateInfo
+               -> Bool
+               -> IO (Count, AbsTime, NanoSecond64)
+collectLatency sv yinfo drain = do
     let cur      = workerPendingLatency yinfo
         col      = workerCollectedLatency yinfo
         longTerm = svarAllTimeLatency yinfo
         measured = workerMeasuredLatency yinfo
 
-    (count, time)       <- atomicModifyIORefCAS cur $ \v -> ((0,0), v)
-    (colCount, colTime) <- readIORef col
-    (lcount, ltime)     <- readIORef longTerm
-    prev                <- readIORef measured
-
-    let pendingCount = colCount + count
-        pendingTime  = colTime + time
-
-        lcount' = lcount + pendingCount
-        notUpdated = (lcount', ltime, prev)
+    (newCount, newLatPair) <- collectWorkerPendingLatency cur col
+    (lcount, ltime) <- readIORef longTerm
+    prevLat <- readIORef measured
+
+    let newLcount = lcount + newCount
+        retWith lat = return (newLcount, ltime, lat)
+
+    case newLatPair of
+        Nothing -> retWith prevLat
+        Just (count, time) -> do
+            let newLat = time `div` (fromIntegral count)
+            when (svarInspectMode sv) $ recordMinMaxLatency sv newLat
+            -- When we have collected a significant sized batch we compute the
+            -- new latency using that batch and return the new latency,
+            -- otherwise we return the previous latency derived from the
+            -- previous batch.
+            if shouldUseCollectedBatch newCount time newLat prevLat || drain
+            then do
+                -- XXX make this NOINLINE?
+                updateWorkerPollingInterval yinfo (max newLat prevLat)
+                when (svarInspectMode sv) $ recordAvgLatency sv (count, time)
+                writeIORef col (0, 0, 0)
+                writeIORef measured ((prevLat + newLat) `div` 2)
+                modifyIORef longTerm $ \(_, t) -> (newLcount, t)
+                retWith newLat
+            else retWith prevLat
 
-    if (pendingCount > 0)
-    then do
-        let new = pendingTime `div` (fromIntegral pendingCount)
-        when (svarInspectMode sv) $ do
-            let ss = svarStats sv
-            minLat <- readIORef (minWorkerLatency ss)
-            when (new < minLat || minLat == 0) $
-                writeIORef (minWorkerLatency ss) new
-
-            maxLat <- readIORef (maxWorkerLatency ss)
-            when (new > maxLat) $ writeIORef (maxWorkerLatency ss) new
-            modifyIORef (avgWorkerLatency ss) $
-                \(cnt, t) -> (cnt + pendingCount, t + pendingTime)
-        -- To avoid minor fluctuations update in batches
-        writeIORef col (0, 0)
-        writeIORef measured new
-        modifyIORef longTerm $ \(_, t) -> (lcount', t)
-        return (lcount', ltime, new)
-    else return notUpdated
+-------------------------------------------------------------------------------
+-- Dumping the SVar for debug/diag
+-------------------------------------------------------------------------------
 
 dumpSVarStats :: SVar t m a -> SVarStats -> SVarStyle -> IO String
 dumpSVarStats sv ss style = do
     case yieldRateInfo sv of
         Nothing -> return ()
         Just yinfo -> do
-            _ <- liftIO $ drainLatency sv yinfo
+            _ <- liftIO $ collectLatency sv yinfo True
             return ()
 
     dispatches <- readIORef $ totalDispatches ss
@@ -625,10 +668,10 @@ dumpSVarStats sv ss style = do
                 case t of
                     Nothing -> do
                         now <- getTime Monotonic
-                        let interval = toNanoSecs (now - startTime)
+                        let interval = diffAbsTime64 now startTime
                         return (cnt, gl, interval `div` fromIntegral cnt)
                     Just stopTime -> do
-                        let interval = toNanoSecs (stopTime - startTime)
+                        let interval = diffAbsTime64 stopTime startTime
                         return (cnt, gl, interval `div` fromIntegral cnt)
             else return (0, 0, 0)
 
@@ -640,21 +683,17 @@ dumpSVarStats sv ss style = do
                then "\nheap max size = " <> show maxHp
                else "")
             <> (if minLat > 0
-               then "\nmin worker latency = "
-                    <> secs (fromIntegral minLat * 1e-9)
+               then "\nmin worker latency = " <> showNanoSecond64 minLat
                else "")
             <> (if maxLat > 0
-               then "\nmax worker latency = "
-                    <> secs (fromIntegral maxLat * 1e-9)
+               then "\nmax worker latency = " <> showNanoSecond64 maxLat
                else "")
             <> (if avgCnt > 0
                 then let lat = avgTime `div` fromIntegral avgCnt
-                     in "\navg worker latency = "
-                        <> secs (fromIntegral lat * 1e-9)
+                     in "\navg worker latency = " <> showNanoSecond64 lat
                 else "")
             <> (if svarLat > 0
-               then "\nSVar latency = "
-                        <> secs (fromIntegral svarLat * 1e-9)
+               then "\nSVar latency = " <> showRelTime64 svarLat
                else "")
             <> (if svarCnt > 0
                then "\nSVar yield count = " <> show svarCnt
@@ -739,46 +778,8 @@ withDiagMVar sv label action =
                          ]
     else action
 
--------------------------------------------------------------------------------
--- CAS
--------------------------------------------------------------------------------
-
--- Slightly faster version of CAS. Gained some improvement by avoiding the use
--- of "evaluate" because we know we do not have exceptions in fn.
-{-# INLINE atomicModifyIORefCAS #-}
-atomicModifyIORefCAS :: IORef a -> (a -> (a,b)) -> IO b
-atomicModifyIORefCAS ref fn = do
-    tkt <- readForCAS ref
-    loop tkt retries
-
-    where
-
-    retries = 25 :: Int
-    loop _   0     = atomicModifyIORef ref fn
-    loop old tries = do
-        let (new, result) = fn $ peekTicket old
-        (success, tkt) <- casIORef ref old new
-        if success
-        then return result
-        else loop tkt (tries - 1)
-
-{-# INLINE ringDoorBell #-}
-ringDoorBell :: SVar t m a -> IO ()
-ringDoorBell sv = do
-    storeLoadBarrier
-    w <- readIORef $ needDoorBell sv
-    when w $ do
-        -- Note: the sequence of operations is important for correctness here.
-        -- We need to set the flag to false strictly before sending the
-        -- outputDoorBell, otherwise the outputDoorBell may get processed too early and
-        -- then we may set the flag to False to later making the consumer lose
-        -- the flag, even without receiving a outputDoorBell.
-        atomicModifyIORefCAS_ (needDoorBell sv) (const False)
-        void $ tryPutMVar (outputDoorBell sv) ()
-
-
 ------------------------------------------------------------------------------
--- Spawning threads and collecting result in streamed fashion
+-- Spawning threads
 ------------------------------------------------------------------------------
 
 -- | A monad that can perform concurrent or parallel IO operations. Streams
@@ -823,6 +824,10 @@ doFork action (RunInIO mrun) exHandler =
                                          exHandler
                 run (return tid)
 
+------------------------------------------------------------------------------
+-- Collecting results from child workers in a streamed fashion
+------------------------------------------------------------------------------
+
 -- XXX Can we make access to remainingWork and yieldRateInfo fields in sv
 -- faster, along with the fields in sv required by send?
 -- XXX make it noinline
@@ -898,7 +903,7 @@ send sv msg = do
             active <- readIORef (workerCount sv)
             return $ len < (fromIntegral lim - active)
 
-workerCollectLatency :: WorkerInfo -> IO (Maybe (Count, NanoSecs))
+workerCollectLatency :: WorkerInfo -> IO (Maybe (Count, NanoSecond64))
 workerCollectLatency winfo = do
     (cnt0, t0) <- readIORef (workerLatencyStart winfo)
     cnt1 <- readIORef (workerYieldCount winfo)
@@ -907,7 +912,7 @@ workerCollectLatency winfo = do
     if cnt > 0
     then do
         t1 <- getTime Monotonic
-        let period = fromInteger $ toNanoSecs (t1 - t0)
+        let period = fromRelTime64 $ diffAbsTime64 t1 t0
         writeIORef (workerLatencyStart winfo) (cnt1, t1)
         return $ Just (cnt, period)
     else return Nothing
@@ -921,6 +926,8 @@ workerCollectLatency winfo = do
 -- described next.
 -- 3) It is possible that a worker returns without yielding anything because it
 -- never got a chance to pick up work.
+-- 4) If the system timer resolution is lower than the latency, the latency
+-- computation turns out to be zero.
 --
 -- We can fix this if we measure the latencies by counting the work items
 -- picked rather than based on the outputs yielded.
@@ -929,8 +936,16 @@ workerUpdateLatency yinfo winfo = do
     r <- workerCollectLatency winfo
     case r of
         Just (cnt, period) -> do
+        -- NOTE: On JS platform the timer resolution could be pretty low. When
+        -- the timer resolution is low, measurement of latencies could be
+        -- tricky. All the worker latencies will turn out to be zero if they
+        -- are lower than the resolution. We only take into account those
+        -- measurements which are more than the timer resolution.
+
             let ref = workerPendingLatency yinfo
-            atomicModifyIORefCAS_ ref $ \(n, t) -> (n + cnt, t + period)
+                (cnt1, t1) = if period > 0 then (cnt, period) else (0, 0)
+            atomicModifyIORefCAS_ ref $
+                    \(fc, n, t) -> (fc + cnt, n + cnt1, t + t1)
         Nothing -> return ()
 
 updateYieldCount :: WorkerInfo -> IO Count
@@ -1008,6 +1023,24 @@ sendStop sv mwinfo = do
     myThreadId >>= \tid -> void $ send sv (ChildStop tid Nothing)
 
 -------------------------------------------------------------------------------
+-- Doorbell
+-------------------------------------------------------------------------------
+
+{-# INLINE ringDoorBell #-}
+ringDoorBell :: SVar t m a -> IO ()
+ringDoorBell sv = do
+    storeLoadBarrier
+    w <- readIORef $ needDoorBell sv
+    when w $ do
+        -- Note: the sequence of operations is important for correctness here.
+        -- We need to set the flag to false strictly before sending the
+        -- outputDoorBell, otherwise the outputDoorBell may get processed too
+        -- early and then we may set the flag to False to later making the
+        -- consumer lose the flag, even without receiving a outputDoorBell.
+        atomicModifyIORefCAS_ (needDoorBell sv) (const False)
+        void $ tryPutMVar (outputDoorBell sv) ()
+
+-------------------------------------------------------------------------------
 -- Async
 -------------------------------------------------------------------------------
 
@@ -1235,6 +1268,10 @@ updateHeapSeq hpVar seqNo =
 -- remaining computation at the back of the queue instead of the heap, and
 -- increment the sequence number.
 
+-------------------------------------------------------------------------------
+-- Dispatching workers and tracking them
+-------------------------------------------------------------------------------
+
 -- Thread tracking is needed for two reasons:
 --
 -- 1) Killing threads on exceptions. Threads may not be left to go away by
@@ -1389,29 +1426,36 @@ dispatchWorker yieldCount sv = do
                 Nothing -> return workerLimit
                 Just ref -> do
                     n <- liftIO $ readIORef ref
-                    return $
-                        case workerLimit of
-                            Unlimited -> Limited (fromIntegral n)
-                            Limited lim -> Limited $ min lim (fromIntegral n)
-
-            -- XXX for ahead streams shall we take the heap yields into account for
-            -- controlling the dispatch? We should not dispatch if the heap has
-            -- already got the limit covered.
+                    case yieldRateInfo sv of
+                        Just _ -> return workerLimit
+                        Nothing ->
+                            return $
+                                case workerLimit of
+                                    Unlimited -> Limited (fromIntegral n)
+                                    Limited lim -> Limited $ min lim (fromIntegral n)
+
+            -- XXX for ahead streams shall we take the heap yields into account
+            -- for controlling the dispatch? We should not dispatch if the heap
+            -- has already got the limit covered.
             let dispatch = pushWorker yieldCount sv >> return True
              in case limit of
                 Unlimited -> dispatch
                 -- Note that the use of remainingWork and workerCount is not
-                -- atomic and the counts may even have changed between reading and
-                -- using them here, so this is just approximate logic and we cannot
-                -- rely on it for correctness. We may actually dispatch more
-                -- workers than required.
-                Limited lim | lim > 0 -> dispatch
+                -- atomic and the counts may even have changed between reading
+                -- and using them here, so this is just approximate logic and
+                -- we cannot rely on it for correctness. We may actually
+                -- dispatch more workers than required.
+                Limited lim | lim > fromIntegral active -> dispatch
                 _ -> return False
         else do
             when (active <= 0) $ pushWorker 0 sv
             return False
     else return False
 
+-------------------------------------------------------------------------------
+-- Dispatch workers with rate control
+-------------------------------------------------------------------------------
+
 -- | This is a magic number and it is overloaded, and used at several places to
 -- achieve batching:
 --
@@ -1420,24 +1464,21 @@ dispatchWorker yieldCount sv = do
 --    sleep time is accumulated.
 -- 3. Collected latencies are computed and transferred to measured latency
 --    after a minimum of this period.
-minThreadDelay :: NanoSecs
-minThreadDelay = 10^(6 :: Int)
+minThreadDelay :: NanoSecond64
+minThreadDelay = 1000000
 
 -- | Another magic number! When we have to start more workers to cover up a
 -- number of yields that we are lagging by then we cannot start one worker for
 -- each yield because that may be a very big number and if the latency of the
 -- workers is low these number of yields could be very high. We assume that we
 -- run each extra worker for at least this much time.
-rateRecoveryTime :: NanoSecs
+rateRecoveryTime :: NanoSecond64
 rateRecoveryTime = 1000000
 
-nanoToMicroSecs :: NanoSecs -> Int
-nanoToMicroSecs s = fromIntegral s `div` 1000
-
 -- We either block, or send one worker with limited yield count or one or more
 -- workers with unlimited yield count.
 data Work
-    = BlockWait NanoSecs
+    = BlockWait NanoSecond64
     | PartialWorker Count
     | ManyWorkers Int Count
     deriving Show
@@ -1447,9 +1488,9 @@ estimateWorkers
     :: Limit
     -> Count
     -> Count
-    -> NanoSecs
-    -> NanoSecs
-    -> NanoSecs
+    -> NanoSecond64
+    -> NanoSecond64
+    -> NanoSecond64
     -> LatencyRange
     -> Work
 estimateWorkers workerLimit svarYields gainLossYields
@@ -1500,7 +1541,7 @@ estimateWorkers workerLimit svarYields gainLossYields
                             fromIntegral rateRecoveryTime
                     yieldsFreq = 1.0 / fromIntegral targetLat
                     totalYieldsFreq = yieldsFreq + deltaYieldsFreq
-                    requiredLat = NanoSecs $ round $ 1.0 / totalYieldsFreq
+                    requiredLat = NanoSecond64 $ round $ 1.0 / totalYieldsFreq
                     adjustedLat = min (max requiredLat (minLatency range))
                                       (maxLatency range)
                 in  assert (adjustedLat > 0) $
@@ -1527,33 +1568,34 @@ estimateWorkers workerLimit svarYields gainLossYields
 -- | Get the worker latency without resetting workerPendingLatency
 -- Returns (total yield count, base time, measured latency)
 -- CAUTION! keep it in sync with collectLatency
-getWorkerLatency :: YieldRateInfo -> IO (Count, TimeSpec, NanoSecs)
+getWorkerLatency :: YieldRateInfo -> IO (Count, AbsTime, NanoSecond64)
 getWorkerLatency yinfo  = do
     let cur      = workerPendingLatency yinfo
         col      = workerCollectedLatency yinfo
         longTerm = svarAllTimeLatency yinfo
         measured = workerMeasuredLatency yinfo
 
-    (count, time)       <- readIORef cur
-    (colCount, colTime) <- readIORef col
+    (curTotalCount, curCount, curTime) <- readIORef cur
+    (colTotalCount, colCount, colTime) <- readIORef col
     (lcount, ltime)     <- readIORef longTerm
-    prev                <- readIORef measured
-
-    let pendingCount = colCount + count
-        pendingTime  = colTime + time
-        new =
-            if pendingCount > 0
-            then let lat = pendingTime `div` fromIntegral pendingCount
+    prevLat             <- readIORef measured
+
+    let latCount = colCount + curCount
+        latTime  = colTime + curTime
+        totalCount = colTotalCount + curTotalCount
+        newLat =
+            if latCount > 0 && latTime > 0
+            then let lat = latTime `div` fromIntegral latCount
                  -- XXX Give more weight to new?
-                 in (lat + prev) `div` 2
-            else prev
-    return (lcount + pendingCount, ltime, new)
+                 in (lat + prevLat) `div` 2
+            else prevLat
+    return (lcount + totalCount, ltime, newLat)
 
 isBeyondMaxRate :: SVar t m a -> YieldRateInfo -> IO Bool
 isBeyondMaxRate sv yinfo = do
     (count, tstamp, wLatency) <- getWorkerLatency yinfo
     now <- getTime Monotonic
-    let duration = fromInteger $ toNanoSecs $ now - tstamp
+    let duration = fromRelTime64 $ diffAbsTime64 now tstamp
     let targetLat = svarLatencyTarget yinfo
     gainLoss <- readIORef (svarGainedLostYields yinfo)
     let work = estimateWorkers (maxWorkerLimit sv) count gainLoss duration
@@ -1565,82 +1607,6 @@ isBeyondMaxRate sv yinfo = do
         ManyWorkers n _ -> cnt > n
         BlockWait _ -> True
 
--- Every once in a while workers update the latencies and check the yield rate.
--- They return if we are above the expected yield rate. If we check too often
--- it may impact performance, if we check less often we may have a stale
--- picture. We update every minThreadDelay but we translate that into a yield
--- count based on latency so that the checking overhead is little.
---
--- XXX use a generation count to indicate that the value is updated. If the
--- value is updated an existing worker must check it again on the next yield.
--- Otherwise it is possible that we may keep updating it and because of the mod
--- worker keeps skipping it.
-updateWorkerPollingInterval :: YieldRateInfo -> NanoSecs -> IO ()
-updateWorkerPollingInterval yinfo latency = do
-    let periodRef = workerPollingInterval yinfo
-        cnt = max 1 $ minThreadDelay `div` latency
-        period = min cnt (fromIntegral magicMaxBuffer)
-
-    writeIORef periodRef (fromIntegral period)
-
--- Returns a triple, (1) yield count since last collection, (2) the base time
--- when we started counting, (3) average latency in the last measurement
--- period. The former two are used for accurate measurement of the going rate
--- whereas the average is used for future estimates e.g. how many workers
--- should be maintained to maintain the rate.
--- CAUTION! keep it in sync with getWorkerLatency
-collectLatency :: SVar t m a -> YieldRateInfo -> IO (Count, TimeSpec, NanoSecs)
-collectLatency sv yinfo = do
-    let cur      = workerPendingLatency yinfo
-        col      = workerCollectedLatency yinfo
-        longTerm = svarAllTimeLatency yinfo
-        measured = workerMeasuredLatency yinfo
-
-    (count, time)       <- atomicModifyIORefCAS cur $ \v -> ((0,0), v)
-    (colCount, colTime) <- readIORef col
-    (lcount, ltime)     <- readIORef longTerm
-    prev                <- readIORef measured
-
-    let pendingCount = colCount + count
-        pendingTime  = colTime + time
-
-        lcount' = lcount + pendingCount
-        tripleWith lat = (lcount', ltime, lat)
-
-    if pendingCount > 0
-    then do
-        let new = pendingTime `div` (fromIntegral pendingCount)
-        when (svarInspectMode sv) $ do
-            let ss = svarStats sv
-            minLat <- readIORef (minWorkerLatency ss)
-            when (new < minLat || minLat == 0) $
-                writeIORef (minWorkerLatency ss) new
-
-            maxLat <- readIORef (maxWorkerLatency ss)
-            when (new > maxLat) $ writeIORef (maxWorkerLatency ss) new
-        -- When we have collected a significant sized batch we compute the new
-        -- latency using that batch and return the new latency, otherwise we
-        -- return the previous latency derived from the previous batch.
-        if     (pendingCount > fromIntegral magicMaxBuffer)
-            || (pendingTime > minThreadDelay)
-            || (let r = fromIntegral new / fromIntegral prev :: Double
-                 in prev > 0 && (r > 2 || r < 0.5))
-            || (prev == 0)
-        then do
-            when (svarInspectMode sv) $ do
-                let ss = svarStats sv
-                modifyIORef (avgWorkerLatency ss) $
-                    \(cnt, t) -> (cnt + pendingCount, t + pendingTime)
-            updateWorkerPollingInterval yinfo (max new prev)
-            writeIORef col (0, 0)
-            writeIORef measured ((prev + new) `div` 2)
-            modifyIORef longTerm $ \(_, t) -> (lcount', t)
-            return $ tripleWith new
-        else do
-            writeIORef col (pendingCount, pendingTime)
-            return $ tripleWith prev
-    else return $ tripleWith prev
-
 -- XXX in case of ahead style stream we need to take the heap size into account
 -- because we return the workers on the basis of that which causes a condition
 -- where we keep dispatching and they keep returning. So we must have exactly
@@ -1655,8 +1621,8 @@ dispatchWorkerPaced sv = do
     (svarYields, svarElapsed, wLatency) <- do
         now <- liftIO $ getTime Monotonic
         (yieldCount, baseTime, lat) <-
-            liftIO $ collectLatency sv yinfo
-        let elapsed = fromInteger $ toNanoSecs $ now - baseTime
+            liftIO $ collectLatency sv yinfo False
+        let elapsed = fromRelTime64 $ diffAbsTime64 now baseTime
         let latency =
                 if lat == 0
                 then
@@ -1698,7 +1664,8 @@ dispatchWorkerPaced sv = do
                 -- still have a Stop event waiting in the outputQueue.
                 done <- allThreadsDone sv
                 when done $ void $ do
-                    liftIO $ threadDelay $ nanoToMicroSecs s
+                    let us = fromRelTime64 (toRelTime64 s) :: MicroSecond64
+                    liftIO $ threadDelay (fromIntegral us)
                     dispatchWorker 1 sv
                 return False
             PartialWorker yields -> do
@@ -1728,8 +1695,9 @@ dispatchWorkerPaced sv = do
                         batch = max 1 $ fromIntegral $
                                     minThreadDelay `div` targetLat
                     -- XXX stagger the workers over a period?
-                    -- XXX cannot sleep, as that would mean we cannot process the
-                    -- outputs. need to try a different mechanism to stagger.
+                    -- XXX cannot sleep, as that would mean we cannot process
+                    -- the outputs. need to try a different mechanism to
+                    -- stagger.
                     -- when (total > batch) $
                        -- liftIO $ threadDelay $ nanoToMicroSecs minThreadDelay
                     dispatchN (min total batch)
@@ -1755,6 +1723,10 @@ dispatchWorkerPaced sv = do
             then dispatchN (n - 1)
             else return False
 
+-------------------------------------------------------------------------------
+-- Worker dispatch and wait loop
+-------------------------------------------------------------------------------
+
 sendWorkerDelayPaced :: SVar t m a -> IO ()
 sendWorkerDelayPaced _ = return ()
 
@@ -1825,18 +1797,18 @@ sendWorkerWait delay dispatch sv = do
         -- queued items in the heap even though the outputQueue is empty, and
         -- we may have active workers which are deadlocked on those items to be
         -- processed by the consumer. We should either guarantee that any
-        -- worker, before returning, clears the heap or we send a worker to clear
-        -- it. Normally we always send a worker if no output is seen, but if
-        -- the thread limit is reached or we are using pacing then we may not
-        -- send a worker. See the concurrentApplication test in the tests, that
-        -- test case requires at least one yield from the producer to not
+        -- worker, before returning, clears the heap or we send a worker to
+        -- clear it. Normally we always send a worker if no output is seen, but
+        -- if the thread limit is reached or we are using pacing then we may
+        -- not send a worker. See the concurrentApplication test in the tests,
+        -- that test case requires at least one yield from the producer to not
         -- deadlock, if the last workers output is stuck in the heap then this
         -- test fails.  This problem can be extended to n threads when the
         -- consumer may depend on the evaluation of next n items in the
         -- producer stream.
 
-        -- register for the outputDoorBell before we check the queue so that if we
-        -- sleep because the queue was empty we are guaranteed to get a
+        -- register for the outputDoorBell before we check the queue so that if
+        -- we sleep because the queue was empty we are guaranteed to get a
         -- doorbell on the next enqueue.
 
         liftIO $ atomicModifyIORefCAS_ (needDoorBell sv) $ const True
@@ -1858,6 +1830,10 @@ sendWorkerWait delay dispatch sv = do
             (_, len) <- liftIO $ readIORef (outputQueue sv)
             when (len <= 0) $ sendWorkerWait delay dispatch sv
 
+-------------------------------------------------------------------------------
+-- Reading from the workers' output queue/buffer
+-------------------------------------------------------------------------------
+
 {-# INLINE readOutputQRaw #-}
 readOutputQRaw :: SVar t m a -> IO ([ChildEvent a], Int)
 readOutputQRaw sv = do
@@ -1956,6 +1932,10 @@ postProcessPaced sv = do
         return r
     else return False
 
+-------------------------------------------------------------------------------
+-- Creating an SVar
+-------------------------------------------------------------------------------
+
 getYieldRateInfo :: State t m a -> IO (Maybe YieldRateInfo)
 getYieldRateInfo st = do
     -- convert rate in Hertz to latency in Nanoseconds
@@ -1972,8 +1952,8 @@ getYieldRateInfo st = do
 
     mkYieldRateInfo latency latRange buf = do
         measured <- newIORef 0
-        wcur     <- newIORef (0,0)
-        wcol     <- newIORef (0,0)
+        wcur     <- newIORef (0,0,0)
+        wcol     <- newIORef (0,0,0)
         now      <- getTime Monotonic
         wlong    <- newIORef (0,now)
         period   <- newIORef 1
@@ -1999,9 +1979,9 @@ newSVarStats = do
     maxOq  <- newIORef 0
     maxHs  <- newIORef 0
     maxWq  <- newIORef 0
-    avgLat <- newIORef (0, NanoSecs 0)
-    maxLat <- newIORef (NanoSecs 0)
-    minLat <- newIORef (NanoSecs 0)
+    avgLat <- newIORef (0, NanoSecond64 0)
+    maxLat <- newIORef (NanoSecond64 0)
+    minLat <- newIORef (NanoSecond64 0)
     stpTime <- newIORef Nothing
 
     return SVarStats
@@ -2162,7 +2142,7 @@ getParallelSVar st mrun = do
             $ takeMVar (outputDoorBell sv)
         case yieldRateInfo sv of
             Nothing -> return ()
-            Just yinfo -> void $ collectLatency sv yinfo
+            Just yinfo -> void $ collectLatency sv yinfo False
         fst `fmap` readOutputQRaw sv
 
 sendFirstWorker :: MonadAsync m => SVar t m a -> t m a -> m (SVar t m a)
@@ -2201,6 +2181,10 @@ newParallelVar st = do
     mrun <- captureMonadState
     liftIO $ getParallelSVar st mrun
 
+-------------------------------------------------------------------------------
+-- Write a stream to an SVar
+-------------------------------------------------------------------------------
+
 -- XXX this errors out for Parallel/Ahead SVars
 -- | Write a stream to an 'SVar' in a non-blocking manner. The stream can then
 -- be read back from the SVar using 'fromSVar'.
diff --git a/src/Streamly/Streams/Async.hs b/src/Streamly/Streams/Async.hs
index 9ac3f26..6279160 100644
--- a/src/Streamly/Streams/Async.hs
+++ b/src/Streamly/Streams/Async.hs
@@ -54,6 +54,7 @@ import Data.Semigroup (Semigroup(..))
 import Prelude hiding (map)
 import qualified Data.Set as S
 
+import Streamly.Atomics (atomicModifyIORefCAS)
 import Streamly.Streams.SVar (fromSVar)
 import Streamly.Streams.Serial (map)
 import Streamly.SVar
diff --git a/src/Streamly/Streams/SVar.hs b/src/Streamly/Streams/SVar.hs
index 7d30e09..a02ed2b 100644
--- a/src/Streamly/Streams/SVar.hs
+++ b/src/Streamly/Streams/SVar.hs
@@ -24,7 +24,7 @@ import Data.IORef (newIORef, readIORef, mkWeakIORef, writeIORef)
 import Data.Maybe (isNothing)
 import Data.Semigroup ((<>))
 import System.IO (hPutStrLn, stderr)
-import System.Clock (Clock(Monotonic), getTime)
+import Streamly.Time.Clock (Clock(Monotonic), getTime)
 import System.Mem (performMajorGC)
 
 import Streamly.SVar
diff --git a/src/Streamly/Time/Clock.hsc b/src/Streamly/Time/Clock.hsc
new file mode 100644
index 0000000..b25ecad
--- /dev/null
+++ b/src/Streamly/Time/Clock.hsc
@@ -0,0 +1,309 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+#if __GLASGOW_HASKELL__ >= 800
+{-# OPTIONS_GHC -Wno-identities #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
+{-# OPTIONS_GHC -fno-warn-unused-imports #-}
+#endif
+
+#ifndef __GHCJS__
+#include "config.h"
+#endif
+
+-- |
+-- Module      : Streamly.Time.Clock
+-- Copyright   : (c) 2019 Harendra Kumar
+--               (c) 2009-2012, Cetin Sert
+--               (c) 2010, Eugene Kirpichov
+-- License     : BSD3
+-- Maintainer  : harendra.kumar@gmail.com
+-- Stability   : experimental
+-- Portability : GHC
+
+-- A majority of the code below has been stolen from the "clock" package.
+
+#if __GHCJS__
+#define HS_CLOCK_GHCJS 1
+#elif (defined (HAVE_TIME_H) && defined(HAVE_CLOCK_GETTIME))
+#define HS_CLOCK_POSIX 1
+#elif __APPLE__
+#define HS_CLOCK_OSX 1
+#elif defined(_WIN32)
+#define HS_CLOCK_WINDOWS 1
+#else
+#error "Time/Clock functionality not implemented for this system"
+#endif
+
+module Streamly.Time.Clock
+    (
+    -- * get time from the system clock
+      Clock(..)
+    , getTime
+    )
+where
+
+import Data.Int (Int32, Int64)
+import Data.Typeable (Typeable)
+import Data.Word (Word32)
+import Foreign.C (CInt(..), throwErrnoIfMinus1_, CTime(..), CLong(..))
+import Foreign.Marshal.Alloc (alloca)
+import Foreign.Ptr (Ptr)
+import Foreign.Storable (Storable(..), peek)
+import GHC.Generics (Generic)
+
+import Streamly.Time.Units (TimeSpec(..), AbsTime(..))
+
+-------------------------------------------------------------------------------
+-- Clock Types
+-------------------------------------------------------------------------------
+
+#if HS_CLOCK_POSIX
+#include <time.h>
+
+#if defined(CLOCK_MONOTONIC_RAW)
+#define HAVE_CLOCK_MONOTONIC_RAW
+#endif
+
+-- XXX this may be RAW on apple not RAW on linux
+#if __linux__ && defined(CLOCK_MONOTONIC_COARSE)
+#define HAVE_CLOCK_MONOTONIC_COARSE
+#endif
+
+#if __APPLE__ && defined(CLOCK_MONOTONIC_RAW_APPROX)
+#define HAVE_CLOCK_MONOTONIC_COARSE
+#endif
+
+#if __linux__ && defined(CLOCK_BOOTTIME)
+#define HAVE_CLOCK_MONOTONIC_UPTIME
+#endif
+
+#if __APPLE__ && defined(CLOCK_UPTIME_RAW)
+#define HAVE_CLOCK_MONOTONIC_UPTIME
+#endif
+
+#if __linux__ && defined(CLOCK_REALTIME_COARSE)
+#define HAVE_CLOCK_REALTIME_COARSE
+#endif
+
+#endif
+
+-- | Clock types. A clock may be system-wide (that is, visible to all processes)
+--   or per-process (measuring time that is meaningful only within a process).
+--   All implementations shall support CLOCK_REALTIME. (The only suspend-aware
+--   monotonic is CLOCK_BOOTTIME on Linux.)
+data Clock
+
+    -- | The identifier for the system-wide monotonic clock, which is defined as
+    --   a clock measuring real time, whose value cannot be set via
+    --   @clock_settime@ and which cannot have negative clock jumps. The maximum
+    --   possible clock jump shall be implementation defined. For this clock,
+    --   the value returned by 'getTime' represents the amount of time (in
+    --   seconds and nanoseconds) since an unspecified point in the past (for
+    --   example, system start-up time, or the Epoch). This point does not
+    --   change after system start-up time. Note that the absolute value of the
+    --   monotonic clock is meaningless (because its origin is arbitrary), and
+    --   thus there is no need to set it. Furthermore, realtime applications can
+    --   rely on the fact that the value of this clock is never set.
+  = Monotonic
+
+    -- | The identifier of the system-wide clock measuring real time. For this
+    --   clock, the value returned by 'getTime' represents the amount of time (in
+    --   seconds and nanoseconds) since the Epoch.
+  | Realtime
+
+#ifndef HS_CLOCK_GHCJS
+    -- | The identifier of the CPU-time clock associated with the calling
+    --   process. For this clock, the value returned by 'getTime' represents the
+    --   amount of execution time of the current process.
+  | ProcessCPUTime
+
+    -- | The identifier of the CPU-time clock associated with the calling OS
+    --   thread. For this clock, the value returned by 'getTime' represents the
+    --   amount of execution time of the current OS thread.
+  | ThreadCPUTime
+#endif
+
+#if defined (HAVE_CLOCK_MONOTONIC_RAW)
+    -- | (since Linux 2.6.28; Linux and Mac OSX)
+    --   Similar to CLOCK_MONOTONIC, but provides access to a
+    --   raw hardware-based time that is not subject to NTP
+    --   adjustments or the incremental adjustments performed by
+    --   adjtime(3).
+  | MonotonicRaw
+#endif
+
+#if defined (HAVE_CLOCK_MONOTONIC_COARSE)
+    -- | (since Linux 2.6.32; Linux and Mac OSX)
+    --   A faster but less precise version of CLOCK_MONOTONIC.
+    --   Use when you need very fast, but not fine-grained timestamps.
+  | MonotonicCoarse
+#endif
+
+#if defined (HAVE_CLOCK_MONOTONIC_UPTIME)
+    -- | (since Linux 2.6.39; Linux and Mac OSX)
+    --   Identical to CLOCK_MONOTONIC, except it also includes
+    --   any time that the system is suspended.  This allows
+    --   applications to get a suspend-aware monotonic clock
+    --   without having to deal with the complications of
+    --   CLOCK_REALTIME, which may have discontinuities if the
+    --   time is changed using settimeofday(2).
+  | Uptime
+#endif
+
+#if defined (HAVE_CLOCK_REALTIME_COARSE)
+    -- | (since Linux 2.6.32; Linux-specific)
+    --   A faster but less precise version of CLOCK_REALTIME.
+    --   Use when you need very fast, but not fine-grained timestamps.
+  | RealtimeCoarse
+#endif
+
+  deriving (Eq, Enum, Generic, Read, Show, Typeable)
+
+-------------------------------------------------------------------------------
+-- Translate the Haskell "Clock" type to C
+-------------------------------------------------------------------------------
+
+#if HS_CLOCK_POSIX
+-- Posix systems (Linux and Mac OSX 10.12 and later)
+clockToPosixClockId :: Clock -> #{type clockid_t}
+clockToPosixClockId Monotonic      = #const CLOCK_MONOTONIC
+clockToPosixClockId Realtime       = #const CLOCK_REALTIME
+clockToPosixClockId ProcessCPUTime = #const CLOCK_PROCESS_CPUTIME_ID
+clockToPosixClockId ThreadCPUTime  = #const CLOCK_THREAD_CPUTIME_ID
+
+#if defined(CLOCK_MONOTONIC_RAW)
+clockToPosixClockId MonotonicRaw = #const CLOCK_MONOTONIC_RAW
+#endif
+
+#if __linux__ && defined (CLOCK_MONOTONIC_COARSE)
+clockToPosixClockId MonotonicCoarse = #const CLOCK_MONOTONIC_COARSE
+#elif __APPLE__ && defined(CLOCK_MONOTONIC_RAW_APPROX)
+clockToPosixClockId MonotonicCoarse = #const CLOCK_MONOTONIC_RAW_APPROX
+#endif
+
+#if __linux__ && defined (CLOCK_REALTIME_COARSE)
+clockToPosixClockId RealtimeCoarse = #const CLOCK_REALTIME_COARSE
+#endif
+
+#if __linux__ && defined(CLOCK_BOOTTIME)
+clockToPosixClockId Uptime = #const CLOCK_BOOTTIME
+#elif __APPLE__ && defined(CLOCK_UPTIME_RAW)
+clockToPosixClockId Uptime = #const CLOCK_UPTIME_RAW
+#endif
+
+#elif HS_CLOCK_OSX
+-- Mac OSX versions prior to 10.12
+#include <time.h>
+#include <mach/clock.h>
+
+clockToOSXClockId :: Clock -> #{type clock_id_t}
+clockToOSXClockId Monotonic      = #const SYSTEM_CLOCK
+clockToOSXClockId Realtime       = #const CALENDAR_CLOCK
+clockToOSXClockId ProcessCPUTime = #const SYSTEM_CLOCK
+clockToOSXClockId ThreadCPUTime  = #const SYSTEM_CLOCK
+#elif HS_CLOCK_GHCJS
+-- XXX need to implement a monotonic clock for JS using performance.now()
+clockToJSClockId :: Clock -> CInt
+clockToJSClockId Monotonic      = 0
+clockToJSClockId Realtime       = 0
+#endif
+
+-------------------------------------------------------------------------------
+-- Clock time
+-------------------------------------------------------------------------------
+
+#if __GLASGOW_HASKELL__ < 800
+#let alignment t = "%lu", (unsigned long)offsetof(struct {char x__; t (y__); }, y__)
+#endif
+
+#ifdef HS_CLOCK_GHCJS
+instance Storable TimeSpec where
+  sizeOf _ = 8
+  alignment _ = 4
+  peek p = do
+    CTime  s <- peekByteOff p 0
+    CLong ns <- peekByteOff p 4
+    return (TimeSpec (fromIntegral s) (fromIntegral ns))
+  poke p (TimeSpec s ns) = do
+    pokeByteOff p 0 ((fromIntegral s) :: CTime)
+    pokeByteOff p 4 ((fromIntegral ns) :: CLong)
+
+#elif HS_CLOCK_WINDOWS
+instance Storable TimeSpec where
+  sizeOf _ = sizeOf (undefined :: Int64) * 2
+  alignment _ = alignment (undefined :: Int64)
+  peek ptr = do
+    s <- peekByteOff ptr 0
+    ns <- peekByteOff ptr (sizeOf (undefined :: Int64))
+    return (TimeSpec s ns)
+  poke ptr ts = do
+      pokeByteOff ptr 0 (sec ts)
+      pokeByteOff ptr (sizeOf (undefined :: Int64)) (nsec ts)
+#else
+instance Storable TimeSpec where
+  sizeOf _ = #{size struct timespec}
+  alignment _ = #{alignment struct timespec}
+  peek ptr = do
+      s :: #{type time_t} <- #{peek struct timespec, tv_sec} ptr
+      ns :: #{type long} <- #{peek struct timespec, tv_nsec} ptr
+      return $ TimeSpec (fromIntegral s) (fromIntegral ns)
+  poke ptr ts = do
+      let s :: #{type time_t} = fromIntegral $ sec ts
+          ns :: #{type long} = fromIntegral $ nsec ts
+      #{poke struct timespec, tv_sec} ptr (s)
+      #{poke struct timespec, tv_nsec} ptr (ns)
+#endif
+
+{-# INLINE getTimeWith #-}
+getTimeWith :: (Ptr TimeSpec -> IO ()) -> IO AbsTime
+getTimeWith f = do
+    t <- alloca (\ptr -> f ptr >> peek ptr)
+    return $ AbsTime t
+
+#if HS_CLOCK_GHCJS
+
+foreign import ccall unsafe "time.h clock_gettime_js"
+    clock_gettime_js :: CInt -> Ptr TimeSpec -> IO CInt
+
+{-# INLINABLE getTime #-}
+getTime :: Clock -> IO AbsTime
+getTime clock =
+    getTimeWith (throwErrnoIfMinus1_ "clock_gettime" .
+        clock_gettime_js (clockToJSClockId clock))
+
+#elif HS_CLOCK_POSIX
+
+foreign import ccall unsafe "time.h clock_gettime"
+    clock_gettime :: #{type clockid_t} -> Ptr TimeSpec -> IO CInt
+
+{-# INLINABLE getTime #-}
+getTime :: Clock -> IO AbsTime
+getTime clock =
+    getTimeWith (throwErrnoIfMinus1_ "clock_gettime" .
+        clock_gettime (clockToPosixClockId clock))
+
+#elif HS_CLOCK_OSX
+
+-- XXX perform error checks inside c implementation
+foreign import ccall
+    clock_gettime_darwin :: #{type clock_id_t} -> Ptr TimeSpec -> IO ()
+
+{-# INLINABLE getTime #-}
+getTime :: Clock -> IO AbsTime
+getTime clock = getTimeWith $ clock_gettime_darwin (clockToOSXClockId clock)
+
+#elif HS_CLOCK_WINDOWS
+
+-- XXX perform error checks inside c implementation
+foreign import ccall clock_gettime_win32_monotonic :: Ptr TimeSpec -> IO ()
+
+{-# INLINABLE getTime #-}
+getTime :: Clock -> IO AbsTime
+getTime Monotonic = getTimeWith $ clock_gettime_win32_monotonic
+getTime RealTime = getTimeWith $ clock_gettime_win32_realtime
+getTime ProcessCPUTime = getTimeWith $ clock_gettime_win32_processtime
+getTime ThreadCPUTime = getTimeWith $ clock_gettime_win32_threadtime
+#endif
diff --git a/src/Streamly/Time/Darwin.c b/src/Streamly/Time/Darwin.c
new file mode 100644
index 0000000..ab68acf
--- /dev/null
+++ b/src/Streamly/Time/Darwin.c
@@ -0,0 +1,36 @@
+/*
+ * Code taken from the Haskell "clock" package.
+ *
+ * Copyright (c) 2009-2012, Cetin Sert
+ * Copyright (c) 2010, Eugene Kirpichov
+ *
+ * OS X code was contributed by Gerolf Seitz on 2013-10-15.
+ */
+
+#ifdef __MACH__
+#include <time.h>
+#include <mach/clock.h>
+#include <mach/mach.h>
+
+void clock_gettime_darwin(clock_id_t clock, struct timespec *ts)
+{
+    clock_serv_t cclock;
+    mach_timespec_t mts;
+    host_get_clock_service(mach_host_self(), clock, &cclock);
+    clock_get_time(cclock, &mts);
+    mach_port_deallocate(mach_task_self(), cclock);
+    ts->tv_sec = mts.tv_sec;
+    ts->tv_nsec = mts.tv_nsec;
+}
+
+void clock_getres_darwin(clock_id_t clock, struct timespec *ts)
+{
+    clock_serv_t cclock;
+    int nsecs;
+    mach_msg_type_number_t count;
+    host_get_clock_service(mach_host_self(), clock, &cclock);
+    clock_get_attributes(cclock, CLOCK_GET_TIME_RES, (clock_attr_t)&nsecs, &count);
+    mach_port_deallocate(mach_task_self(), cclock);
+}
+
+#endif  /* __MACH__ */
diff --git a/src/Streamly/Time/Units.hs b/src/Streamly/Time/Units.hs
new file mode 100644
index 0000000..ade70c1
--- /dev/null
+++ b/src/Streamly/Time/Units.hs
@@ -0,0 +1,471 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE ScopedTypeVariables        #-}
+
+#include "inline.hs"
+
+-- |
+-- Module      : Streamly.Time.Units
+-- Copyright   : (c) 2019 Harendra Kumar
+--
+-- License     : BSD3
+-- Maintainer  : harendra.kumar@gmail.com
+-- Stability   : experimental
+-- Portability : GHC
+
+module Streamly.Time.Units
+    (
+    -- * Time Unit Conversions
+      TimeUnit()
+    -- , TimeUnitWide()
+    , TimeUnit64()
+
+    -- * Time Units
+    , TimeSpec(..)
+    , NanoSecond64(..)
+    , MicroSecond64(..)
+    , MilliSecond64(..)
+    , showNanoSecond64
+
+    -- * Absolute times (using TimeSpec)
+    , AbsTime(..)
+    , toAbsTime
+    , fromAbsTime
+
+    -- * Relative times (using TimeSpec)
+    , RelTime
+    , toRelTime
+    , fromRelTime
+    , diffAbsTime
+    , addToAbsTime
+
+    -- * Relative times (using NanoSecond64)
+    , RelTime64
+    , toRelTime64
+    , fromRelTime64
+    , diffAbsTime64
+    , addToAbsTime64
+    , showRelTime64
+    )
+where
+
+import Data.Int
+import Text.Printf (printf)
+
+-------------------------------------------------------------------------------
+-- Some constants
+-------------------------------------------------------------------------------
+
+{-# INLINE tenPower3 #-}
+tenPower3 :: Int64
+tenPower3 = 1000
+
+{-# INLINE tenPower6 #-}
+tenPower6 :: Int64
+tenPower6 = 1000000
+
+{-# INLINE tenPower9 #-}
+tenPower9 :: Int64
+tenPower9 = 1000000000
+
+-------------------------------------------------------------------------------
+-- Time Unit Representations
+-------------------------------------------------------------------------------
+
+-- XXX We should be able to use type families to use different represenations
+-- for a unit.
+--
+-- Second Rational
+-- Second Double
+-- Second Int64
+-- Second Integer
+-- NanoSecond Int64
+-- ...
+
+-- Double or Fixed would be a much better representation so that we do not lose
+-- information between conversions. However, for faster arithmetic operations
+-- we use an 'Int64' here. When we need convservation of values we can use a
+-- different system of units with a Fixed precision.
+
+-------------------------------------------------------------------------------
+-- Integral Units
+-------------------------------------------------------------------------------
+
+-- | An 'Int64' time representation with a nanosecond resolution. It can
+-- represent time up to ~292 years.
+newtype NanoSecond64 = NanoSecond64 Int64
+    deriving ( Eq
+             , Read
+             , Show
+             , Enum
+             , Bounded
+             , Num
+             , Real
+             , Integral
+             , Ord
+             )
+
+-- | An 'Int64' time representation with a microsecond resolution.
+-- It can represent time up to ~292,000 years.
+newtype MicroSecond64 = MicroSecond64 Int64
+    deriving ( Eq
+             , Read
+             , Show
+             , Enum
+             , Bounded
+             , Num
+             , Real
+             , Integral
+             , Ord
+             )
+
+-- | An 'Int64' time representation with a millisecond resolution.
+-- It can represent time up to ~292 million years.
+newtype MilliSecond64 = MilliSecond64 Int64
+    deriving ( Eq
+             , Read
+             , Show
+             , Enum
+             , Bounded
+             , Num
+             , Real
+             , Integral
+             , Ord
+             )
+
+-------------------------------------------------------------------------------
+-- Fractional Units
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+-- TimeSpec representation
+-------------------------------------------------------------------------------
+
+-- A structure storing seconds and nanoseconds as 'Int64' is the simplest and
+-- fastest way to store practically large quantities of time with efficient
+-- arithmetic operations. If we store nanoseconds using 'Integer' it can store
+-- practically unbounded quantities but it may not be as efficient to
+-- manipulate in performance critical applications. XXX need to measure the
+-- performance.
+--
+-- | Data type to represent practically large quantities of time efficiently.
+-- It can represent time up to ~292 billion years at nanosecond resolution.
+data TimeSpec = TimeSpec
+  { sec  :: {-# UNPACK #-} !Int64 -- ^ seconds
+  , nsec :: {-# UNPACK #-} !Int64 -- ^ nanoseconds
+  } deriving (Eq, Read, Show)
+
+-- We assume that nsec is always less than 10^9. When TimeSpec is negative then
+-- both sec and nsec are negative.
+instance Ord TimeSpec where
+    compare (TimeSpec s1 ns1) (TimeSpec s2 ns2) =
+        if s1 == s2
+        then compare ns1 ns2
+        else compare s1 s2
+
+-- make sure nsec is less than 10^9
+{-# INLINE addWithOverflow #-}
+addWithOverflow :: TimeSpec -> TimeSpec -> TimeSpec
+addWithOverflow (TimeSpec s1 ns1) (TimeSpec s2 ns2) =
+    let nsum = ns1 + ns2
+        (s', ns) = if (nsum > tenPower9 || nsum < negate tenPower9)
+                    then nsum `divMod` tenPower9
+                    else (0, nsum)
+    in TimeSpec (s1 + s2 + s') ns
+
+-- make sure both sec and nsec have the same sign
+{-# INLINE adjustSign #-}
+adjustSign :: TimeSpec -> TimeSpec
+adjustSign (t@(TimeSpec s ns)) =
+    if (s > 0 && ns < 0)
+    then TimeSpec (s - 1) (ns + tenPower9)
+    else if (s < 0 && ns > 0)
+    then TimeSpec (s + 1) (ns - tenPower9)
+    else t
+
+{-# INLINE timeSpecToInteger #-}
+timeSpecToInteger :: TimeSpec -> Integer
+timeSpecToInteger (TimeSpec s ns) = toInteger $ s * tenPower9 + ns
+
+instance Num TimeSpec where
+    {-# INLINE (+) #-}
+    t1 + t2 = adjustSign (addWithOverflow t1 t2)
+
+    -- XXX will this be more optimal if imlemented without "negate"?
+    {-# INLINE (-) #-}
+    t1 - t2 = t1 + (negate t2)
+    t1 * t2 = fromInteger $ timeSpecToInteger t1 * timeSpecToInteger t2
+
+    {-# INLINE negate #-}
+    negate (TimeSpec s ns) = TimeSpec (negate s) (negate ns)
+    {-# INLINE abs #-}
+    abs    (TimeSpec s ns) = TimeSpec (abs s) (abs ns)
+    {-# INLINE signum #-}
+    signum (TimeSpec s ns) | s == 0    = TimeSpec (signum ns) 0
+                           | otherwise = TimeSpec (signum s) 0
+    -- This is fromNanoSecond64 Integer
+    {-# INLINE fromInteger #-}
+    fromInteger nanosec = TimeSpec (fromInteger s) (fromInteger ns)
+        where (s, ns) = nanosec `divMod` toInteger tenPower9
+
+-------------------------------------------------------------------------------
+-- Time unit conversions
+-------------------------------------------------------------------------------
+
+-- TODO: compare whether using TimeSpec instead of Integer provides significant
+-- performance boost. If not then we can just use Integer nanoseconds and get
+-- rid of TimeUnitWide.
+--
+-- | A type class for converting between time units using 'Integer' as the
+-- intermediate and the widest representation with a nanosecond resolution.
+-- This system of units can represent arbitrarily large times but provides
+-- least efficient arithmetic operations due to 'Integer' arithmetic.
+--
+-- NOTE: Converting to and from units may truncate the value depending on the
+-- original value and the size and resolution of the destination unit.
+{-
+class TimeUnitWide a where
+    toTimeInteger   :: a -> Integer
+    fromTimeInteger :: Integer -> a
+-}
+
+-- | A type class for converting between units of time using 'TimeSpec' as the
+-- intermediate representation.  This system of units can represent up to ~292
+-- billion years at nanosecond resolution with reasonably efficient arithmetic
+-- operations.
+--
+-- NOTE: Converting to and from units may truncate the value depending on the
+-- original value and the size and resolution of the destination unit.
+class TimeUnit a where
+    toTimeSpec   :: a -> TimeSpec
+    fromTimeSpec :: TimeSpec -> a
+
+-- XXX we can use a fromNanoSecond64 for conversion with overflow check and
+-- fromNanoSecond64Unsafe for conversion without overflow check.
+--
+-- | A type class for converting between units of time using 'Int64' as the
+-- intermediate representation with a nanosecond resolution.  This system of
+-- units can represent up to ~292 years at nanosecond resolution with fast
+-- arithmetic operations.
+--
+-- NOTE: Converting to and from units may truncate the value depending on the
+-- original value and the size and resolution of the destination unit.
+class TimeUnit64 a where
+    toNanoSecond64   :: a -> NanoSecond64
+    fromNanoSecond64 :: NanoSecond64 -> a
+
+-------------------------------------------------------------------------------
+-- Time units
+-------------------------------------------------------------------------------
+
+instance TimeUnit TimeSpec where
+    toTimeSpec = id
+    fromTimeSpec = id
+
+instance TimeUnit NanoSecond64 where
+    {-# INLINE toTimeSpec #-}
+    toTimeSpec (NanoSecond64 t) = TimeSpec s ns
+        where (s, ns) = t `divMod` tenPower9
+
+    {-# INLINE fromTimeSpec #-}
+    fromTimeSpec (TimeSpec s ns) =
+        NanoSecond64 $ s * tenPower9 + ns
+
+instance TimeUnit64 NanoSecond64 where
+    {-# INLINE toNanoSecond64 #-}
+    toNanoSecond64 = id
+
+    {-# INLINE fromNanoSecond64 #-}
+    fromNanoSecond64 = id
+
+instance TimeUnit MicroSecond64 where
+    {-# INLINE toTimeSpec #-}
+    toTimeSpec (MicroSecond64 t) = TimeSpec s us
+        where (s, us) = t `divMod` tenPower6
+
+    {-# INLINE fromTimeSpec #-}
+    fromTimeSpec (TimeSpec s us) =
+        MicroSecond64 $ s * tenPower6 + us
+
+instance TimeUnit64 MicroSecond64 where
+    {-# INLINE toNanoSecond64 #-}
+    toNanoSecond64 (MicroSecond64 us) = NanoSecond64 $ us * tenPower3
+
+    {-# INLINE fromNanoSecond64 #-}
+    fromNanoSecond64 (NanoSecond64 ns) = MicroSecond64 $ ns `div` tenPower3
+
+instance TimeUnit MilliSecond64 where
+    {-# INLINE toTimeSpec #-}
+    toTimeSpec (MilliSecond64 t) = TimeSpec s us
+        where (s, us) = t `divMod` tenPower3
+
+    {-# INLINE fromTimeSpec #-}
+    fromTimeSpec (TimeSpec s us) =
+        MilliSecond64 $ s * tenPower3 + us
+
+instance TimeUnit64 MilliSecond64 where
+    {-# INLINE toNanoSecond64 #-}
+    toNanoSecond64 (MilliSecond64 us) = NanoSecond64 $ us * tenPower6
+
+    {-# INLINE fromNanoSecond64 #-}
+    fromNanoSecond64 (NanoSecond64 ns) = MilliSecond64 $ ns `div` tenPower6
+
+-------------------------------------------------------------------------------
+-- Absolute time
+-------------------------------------------------------------------------------
+
+-- | Absolute times are relative to a predefined epoch in time. 'AbsTime'
+-- represents times using 'TimeSpec' which can represent times up to ~292
+-- billion years at a nanosecond resolution.
+newtype AbsTime = AbsTime TimeSpec
+    deriving (Eq, Ord, Show)
+
+-- | Convert a 'TimeUnit' to an absolute time.
+{-# INLINE_NORMAL toAbsTime #-}
+toAbsTime :: TimeUnit a => a -> AbsTime
+toAbsTime = AbsTime . toTimeSpec
+
+-- | Convert absolute time to a 'TimeUnit'.
+{-# INLINE_NORMAL fromAbsTime #-}
+fromAbsTime :: TimeUnit a => AbsTime -> a
+fromAbsTime (AbsTime t) = fromTimeSpec t
+
+-- XXX We can also write rewrite rules to simplify divisions multiplications
+-- and additions when manipulating units. Though, that might get simplified at
+-- the assembly (llvm) level as well. Note to/from conversions may be lossy and
+-- therefore this equation may not hold, but that's ok.
+{-# RULES "fromAbsTime/toAbsTime" forall a. toAbsTime (fromAbsTime a) = a #-}
+{-# RULES "toAbsTime/fromAbsTime" forall a. fromAbsTime (toAbsTime a) = a #-}
+
+-------------------------------------------------------------------------------
+-- Relative time using NaonoSecond64 as the underlying representation
+-------------------------------------------------------------------------------
+
+-- We use a separate type to represent relative time for safety and speed.
+-- RelTime has a Num instance, absolute time doesn't.  Relative times are
+-- usually shorter and for our purposes an Int64 nanoseconds can hold close to
+-- thousand year duration. It is also faster to manipulate. We do not check for
+-- overflows during manipulations so use it only when you know the time cannot
+-- be too big. If you need a bigger RelTime representation then use RelTimeBig.
+
+-- | Relative times are relative to some arbitrary point of time. Unlike
+-- 'AbsTime' they are not relative to a predefined epoch.
+newtype RelTime64 = RelTime64 NanoSecond64
+    deriving ( Eq
+             , Read
+             , Show
+             , Enum
+             , Bounded
+             , Num
+             , Real
+             , Integral
+             , Ord
+             )
+
+-- | Convert a 'TimeUnit' to a relative time.
+{-# INLINE_NORMAL toRelTime64 #-}
+toRelTime64 :: TimeUnit64 a => a -> RelTime64
+toRelTime64 = RelTime64 . toNanoSecond64
+
+-- | Convert relative time to a 'TimeUnit'.
+{-# INLINE_NORMAL fromRelTime64 #-}
+fromRelTime64 :: TimeUnit64 a => RelTime64 -> a
+fromRelTime64 (RelTime64 t) = fromNanoSecond64 t
+
+{-# RULES "fromRelTime64/toRelTime64" forall a .
+          toRelTime64 (fromRelTime64 a) = a #-}
+
+{-# RULES "toRelTime64/fromRelTime64" forall a .
+          fromRelTime64 (toRelTime64 a) = a #-}
+
+-- | Difference between two absolute points of time.
+{-# INLINE diffAbsTime64 #-}
+diffAbsTime64 :: AbsTime -> AbsTime -> RelTime64
+diffAbsTime64 (AbsTime (TimeSpec s1 ns1)) (AbsTime (TimeSpec s2 ns2)) =
+    RelTime64 $ NanoSecond64 $ ((s1 - s2) * tenPower9) + (ns1 - ns2)
+
+{-# INLINE addToAbsTime64 #-}
+addToAbsTime64 :: AbsTime -> RelTime64 -> AbsTime
+addToAbsTime64 (AbsTime (TimeSpec s1 ns1)) (RelTime64 (NanoSecond64 ns2)) =
+    AbsTime $ TimeSpec (s1 + s) ns
+    where (s, ns) = (ns1 + ns2) `divMod` tenPower9
+
+-------------------------------------------------------------------------------
+-- Relative time using TimeSpec as the underlying representation
+-------------------------------------------------------------------------------
+
+newtype RelTime = RelTime TimeSpec
+    deriving ( Eq
+             , Read
+             , Show
+             -- , Enum
+             -- , Bounded
+             , Num
+             -- , Real
+             -- , Integral
+             , Ord
+             )
+
+{-# INLINE_NORMAL toRelTime #-}
+toRelTime :: TimeUnit a => a -> RelTime
+toRelTime = RelTime . toTimeSpec
+
+{-# INLINE_NORMAL fromRelTime #-}
+fromRelTime :: TimeUnit a => RelTime -> a
+fromRelTime (RelTime t) = fromTimeSpec t
+
+{-# RULES "fromRelTime/toRelTime" forall a. toRelTime (fromRelTime a) = a #-}
+{-# RULES "toRelTime/fromRelTime" forall a. fromRelTime (toRelTime a) = a #-}
+
+-- XXX rename to diffAbsTimes?
+{-# INLINE diffAbsTime #-}
+diffAbsTime :: AbsTime -> AbsTime -> RelTime
+diffAbsTime (AbsTime t1) (AbsTime t2) = RelTime (t1 - t2)
+
+{-# INLINE addToAbsTime #-}
+addToAbsTime :: AbsTime -> RelTime -> AbsTime
+addToAbsTime (AbsTime t1) (RelTime t2) = AbsTime $ t1 + t2
+
+-------------------------------------------------------------------------------
+-- Formatting and printing
+-------------------------------------------------------------------------------
+
+-- | Convert nanoseconds to a string showing time in an appropriate unit.
+showNanoSecond64 :: NanoSecond64 -> String
+showNanoSecond64 time@(NanoSecond64 ns)
+    | time < 0    = '-' : showNanoSecond64 (-time)
+    | ns < 1000 = fromIntegral ns `with` "ns"
+#ifdef mingw32_HOST_OS
+    | ns < 1000000 = (fromIntegral ns / 1000) `with` "us"
+#else
+    | ns < 1000000 = (fromIntegral ns / 1000) `with` "μs"
+#endif
+    | ns < 1000000000 = (fromIntegral ns / 1000000) `with` "ms"
+    | ns < (60 * 1000000000) = (fromIntegral ns / 1000000000) `with` "s"
+    | ns < (60 * 60 * 1000000000) =
+        (fromIntegral ns / (60 * 1000000000)) `with` "min"
+    | ns < (24 * 60 * 60 * 1000000000) =
+        (fromIntegral ns / (60 * 60 * 1000000000)) `with` "hr"
+    | ns < (365 * 24 * 60 * 60 * 1000000000) =
+        (fromIntegral ns / (24 * 60 * 60 * 1000000000)) `with` "days"
+    | otherwise =
+        (fromIntegral ns / (365 * 24 * 60 * 60 * 1000000000)) `with` "years"
+     where with (t :: Double) (u :: String)
+               | t >= 1e9  = printf "%.4g %s" t u
+               | t >= 1e3  = printf "%.0f %s" t u
+               | t >= 1e2  = printf "%.1f %s" t u
+               | t >= 1e1  = printf "%.2f %s" t u
+               | otherwise = printf "%.3f %s" t u
+
+-- In general we should be able to show the time in a specified unit, if we
+-- omit the unit we can show it in an automatically chosen one.
+{-
+data UnitName =
+      Nano
+    | Micro
+    | Milli
+    | Sec
+-}
+
+showRelTime64 :: RelTime64 -> String
+showRelTime64 = showNanoSecond64 . fromRelTime64
diff --git a/src/Streamly/Time/Windows.c b/src/Streamly/Time/Windows.c
new file mode 100644
index 0000000..3184aaa
--- /dev/null
+++ b/src/Streamly/Time/Windows.c
@@ -0,0 +1,115 @@
+/*
+ * Code taken from the Haskell "clock" package.
+ *
+ * Copyright (c) 2009-2012, Cetin Sert
+ * Copyright (c) 2010, Eugene Kirpichov
+ */
+
+#ifdef _WIN32
+#include <windows.h>
+
+#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
+  #define U64(x) x##Ui64
+#else
+  #define U64(x) x##ULL
+#endif
+
+#define DELTA_EPOCH_IN_100NS  U64(116444736000000000)
+
+static long ticks_to_nanos(LONGLONG subsecond_time, LONGLONG frequency)
+{
+    return (long)((1e9 * subsecond_time) / frequency);
+}
+
+static ULONGLONG to_quad_100ns(FILETIME ft)
+{
+    ULARGE_INTEGER li;
+    li.LowPart = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+    return li.QuadPart;
+}
+
+static void to_timespec_from_100ns(ULONGLONG t_100ns, long long *t)
+{
+    t[0] = (long)(t_100ns / 10000000UL);
+    t[1] = 100*(long)(t_100ns % 10000000UL);
+}
+
+void clock_gettime_win32_monotonic(long long* t)
+{
+   LARGE_INTEGER time;
+   LARGE_INTEGER frequency;
+   QueryPerformanceCounter(&time);
+   QueryPerformanceFrequency(&frequency);
+   // seconds
+   t[0] = time.QuadPart / frequency.QuadPart;
+   // nanos =
+   t[1] = ticks_to_nanos(time.QuadPart % frequency.QuadPart, frequency.QuadPart);
+}
+
+void clock_gettime_win32_realtime(long long* t)
+{
+    FILETIME ft;
+    ULONGLONG tmp;
+
+    GetSystemTimeAsFileTime(&ft);
+
+    tmp = to_quad_100ns(ft);
+    tmp -= DELTA_EPOCH_IN_100NS;
+
+    to_timespec_from_100ns(tmp, t);
+}
+
+void clock_gettime_win32_processtime(long long* t)
+{
+    FILETIME creation_time, exit_time, kernel_time, user_time;
+    ULONGLONG time;
+
+    GetProcessTimes(GetCurrentProcess(), &creation_time, &exit_time, &kernel_time, &user_time);
+    // Both kernel and user, acc. to http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_117
+
+    time = to_quad_100ns(user_time) + to_quad_100ns(kernel_time);
+    to_timespec_from_100ns(time, t);
+}
+
+void clock_gettime_win32_threadtime(long long* t)
+{
+    FILETIME creation_time, exit_time, kernel_time, user_time;
+    ULONGLONG time;
+
+    GetThreadTimes(GetCurrentThread(), &creation_time, &exit_time, &kernel_time, &user_time);
+    // Both kernel and user, acc. to http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_117
+
+    time = to_quad_100ns(user_time) + to_quad_100ns(kernel_time);
+    to_timespec_from_100ns(time, t);
+}
+
+void clock_getres_win32_monotonic(long long* t)
+{
+    LARGE_INTEGER frequency;
+    QueryPerformanceFrequency(&frequency);
+
+    ULONGLONG resolution = U64(1000000000)/frequency.QuadPart;
+    t[0] = resolution / U64(1000000000);
+    t[1] = resolution % U64(1000000000);
+}
+
+void clock_getres_win32_realtime(long long* t)
+{
+    t[0] = 0;
+    t[1] = 100;
+}
+
+void clock_getres_win32_processtime(long long* t)
+{
+    t[0] = 0;
+    t[1] = 100;
+}
+
+void clock_getres_win32_threadtime(long long* t)
+{
+    t[0] = 0;
+    t[1] = 100;
+}
+
+#endif  /* _WIN32 */
diff --git a/src/Streamly/Time/config.h.in b/src/Streamly/Time/config.h.in
new file mode 100644
index 0000000..f2cea8b
--- /dev/null
+++ b/src/Streamly/Time/config.h.in
@@ -0,0 +1,55 @@
+/* src/Streamly/Time/config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the `clock_gettime' function. */
+#undef HAVE_CLOCK_GETTIME
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <time.h> header file. */
+#undef HAVE_TIME_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
diff --git a/src/Streamly/Tutorial.hs b/src/Streamly/Tutorial.hs
index cd6a935..20584ff 100644
--- a/src/Streamly/Tutorial.hs
+++ b/src/Streamly/Tutorial.hs
@@ -1441,9 +1441,9 @@ import Control.Monad.Trans.Class   (MonadTrans (lift))
 -- and operators instead of the ugly pragmas.
 --
 -- For more concurrent programming examples see,
--- <src/examples/ListDir.hs ListDir.hs>,
--- <src/examples/MergeSort.hs MergeSort.hs> and
--- <src/examples/SearchQuery.hs SearchQuery.hs> in the examples directory.
+-- <examples/ListDir.hs ListDir.hs>,
+-- <examples/MergeSort.hs MergeSort.hs> and
+-- <examples/SearchQuery.hs SearchQuery.hs> in the examples directory.
 
 -- $reactive
 --
@@ -1518,13 +1518,13 @@ import Control.Monad.Trans.Class   (MonadTrans (lift))
 -- @
 --
 -- You can also find the source of this example in the examples directory as
--- <src/examples/AcidRain.hs AcidRain.hs>. It has been adapted from Gabriel's
+-- <examples/AcidRain.hs AcidRain.hs>. It has been adapted from Gabriel's
 -- <https://hackage.haskell.org/package/pipes-concurrency-2.0.8/docs/Pipes-Concurrent-Tutorial.html pipes-concurrency>
 -- package.
 -- This is much simpler compared to the pipes version because of the builtin
 -- concurrency in streamly. You can also find a SDL based reactive programming
 -- example adapted from Yampa in
--- <src/examples/CirclingSquare.hs CirclingSquare.hs>.
+-- <examples/CirclingSquare.hs CirclingSquare.hs>.
 
 -- $performance
 --
@@ -1605,7 +1605,7 @@ import Control.Monad.Trans.Class   (MonadTrans (lift))
 -- import qualified Streaming.Prelude as SG
 --
 -- -- | streaming to streamly
--- fromStreaming :: (IsStream t, Monad m) => SG.Stream (SG.Of a) m r -> t m a
+-- fromStreaming :: (IsStream t, MonadAsync m) => SG.Stream (SG.Of a) m r -> t m a
 -- fromStreaming = S.unfoldrM SG.uncons
 --
 -- -- | streamly to streaming
diff --git a/stack-7.10.yaml b/stack-7.10.yaml
index f0449ab..c071c0c 100644
--- a/stack-7.10.yaml
+++ b/stack-7.10.yaml
@@ -4,8 +4,6 @@ packages:
 extra-deps:
     - QuickCheck-2.10
     - lockfree-queue-0.2.3.1
-    - simple-conduit-0.4.0
-    - transient-0.5.9.2
     - http-conduit-2.2.2
     - http-client-0.5.0
     - http-client-tls-0.3.0
diff --git a/stack-8.0.yaml b/stack-8.0.yaml
index ea2b290..4b84dac 100644
--- a/stack-8.0.yaml
+++ b/stack-8.0.yaml
@@ -4,7 +4,6 @@ packages:
 extra-deps:
     - QuickCheck-2.10
     - lockfree-queue-0.2.3.1
-    - simple-conduit-0.6.0
     - SDL-0.6.5.1
     - gauge-0.2.4
     - basement-0.0.4
diff --git a/stack.yaml b/stack.yaml
index ff1b430..dc32f00 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,16 +1,12 @@
-resolver: lts-12.11
+resolver: lts-13.13
 packages:
 - '.'
 extra-deps:
     - SDL-0.6.6.0
-    - gauge-0.2.4
     - Chart-1.9
     - Chart-diagrams-1.9
     - SVGFonts-1.6.0.3
     - bench-show-0.2.2
-    - statistics-0.15.0.0
-    - dense-linear-algebra-0.1.0.0
-    - math-functions-0.3.0.2
 
 flags: {}
 extra-package-dbs: []
diff --git a/streamly.cabal b/streamly.cabal
index 1d9dedb..49309d4 100644
--- a/streamly.cabal
+++ b/streamly.cabal
@@ -1,5 +1,5 @@
 name:               streamly
-version:            0.6.0
+version:            0.6.1
 synopsis:           Beautiful Streaming, Concurrent and Reactive Composition
 description:
   Streamly, short for streaming concurrently, provides monadic streams, with a
@@ -71,13 +71,13 @@ license-file:        LICENSE
 tested-with:         GHC==7.10.3
                    , GHC==8.0.2
                    , GHC==8.4.4
-                   , GHC==8.6.3
+                   , GHC==8.6.4
 author:              Harendra Kumar
 maintainer:          harendra.kumar@gmail.com
 copyright:           2017 Harendra Kumar
 category:            Control, Concurrency, Streaming, Reactivity
 stability:           Experimental
-build-type:          Simple
+build-type:          Configure
 cabal-version:       >= 1.10
 
 extra-source-files:
@@ -91,6 +91,15 @@ extra-source-files:
     stack.yaml
     src/Streamly/Streams/Instances.hs
     src/Streamly/Streams/inline.hs
+    configure.ac
+    configure
+    src/Streamly/Time/config.h.in
+
+extra-tmp-files:
+    config.log
+    config.status
+    autom4te.cache
+    src/Streamly/Time/config.h
 
 source-repository head
     type: git
@@ -101,6 +110,11 @@ flag dev
   manual: True
   default: False
 
+flag no-charts
+  description: Disable chart generation
+  manual: True
+  default: False
+
 flag no-fusion
   description: Disable rewrite rules
   manual: True
@@ -126,8 +140,18 @@ flag examples-sdl
 -------------------------------------------------------------------------------
 
 library
+    js-sources: jsbits/clock.js
+    include-dirs:     src/Streamly/Time
+                    , src/Streamly/Streams
+    if os(windows)
+      c-sources:     src/Streamly/Time/Windows.c
+    if os(darwin)
+      c-sources:     src/Streamly/Time/Darwin.c
     hs-source-dirs:    src
-    other-modules:     Streamly.SVar
+    other-modules:     Streamly.Atomics
+                     , Streamly.SVar
+                     , Streamly.Time.Units
+                     , Streamly.Time.Clock
 
                     -- Base streams
                      , Streamly.Streams.StreamK.Type
@@ -186,7 +210,6 @@ library
                     -- concurrency
                      , atomic-primops    >= 0.8   && < 0.9
                      , lockfree-queue    >= 0.2.3 && < 0.3
-                     , clock             >= 0.7.1 && < 0.8
 
                     -- transfomers
                      , exceptions        >= 0.8   && < 0.11
@@ -208,6 +231,7 @@ library
 test-suite test
   type: exitcode-stdio-1.0
   main-is: Main.hs
+  js-sources: jsbits/clock.js
   hs-source-dirs: test
   ghc-options:  -O0 -Wall -threaded -with-rtsopts=-N -fno-ignore-asserts
   if flag(dev)
@@ -285,6 +309,7 @@ test-suite test
 test-suite properties
   type: exitcode-stdio-1.0
   main-is: Prop.hs
+  js-sources: jsbits/clock.js
   hs-source-dirs: test
   ghc-options:  -fno-ignore-asserts -Wall -O0 -threaded -with-rtsopts=-N
   if flag(dev)
@@ -303,7 +328,7 @@ test-suite properties
   build-depends:
       streamly
     , base              >= 4.8   && < 5
-    , QuickCheck        >= 2.10  && < 2.13
+    , QuickCheck        >= 2.10  && < 2.14
     , hspec             >= 2.0   && < 3
   if impl(ghc < 8.0)
     build-depends:
@@ -314,6 +339,7 @@ test-suite maxrate
   type: exitcode-stdio-1.0
   default-language: Haskell2010
   main-is: MaxRate.hs
+  js-sources: jsbits/clock.js
   hs-source-dirs:  test
   ghc-options:  -fno-ignore-asserts -O2 -Wall -threaded -with-rtsopts=-N
   if flag(dev)
@@ -481,9 +507,18 @@ benchmark nested
 
 benchmark base
   type: exitcode-stdio-1.0
+  include-dirs:     src/Streamly/Time
+                  , src/Streamly/Streams
+  if os(windows)
+    c-sources:     src/Streamly/Time/Windows.c
+  if os(darwin)
+    c-sources:     src/Streamly/Time/Darwin.c
   hs-source-dirs: benchmark, src
   main-is: BaseStreams.hs
-  other-modules:     Streamly.SVar
+  other-modules:     Streamly.Atomics
+                   , Streamly.Time.Units
+                   , Streamly.Time.Clock
+                   , Streamly.SVar
                    , Streamly.Streams.StreamK.Type
                    , Streamly.Streams.StreamK
                    , Streamly.Streams.StreamD.Type
@@ -524,7 +559,6 @@ benchmark base
       -- concurrency
       , atomic-primops    >= 0.8   && < 0.9
       , lockfree-queue    >= 0.2.3 && < 0.3
-      , clock             >= 0.7.1 && < 0.8
 
       , exceptions        >= 0.8   && < 0.11
       , monad-control     >= 1.0   && < 2
@@ -540,8 +574,17 @@ benchmark base
 
 executable nano-bench
   hs-source-dirs: benchmark, src
+  include-dirs:     src/Streamly/Time
+                  , src/Streamly/Streams
+  if os(windows)
+    c-sources:     src/Streamly/Time/Windows.c
+  if os(darwin)
+    c-sources:     src/Streamly/Time/Darwin.c
   main-is: NanoBenchmarks.hs
-  other-modules:     Streamly.SVar
+  other-modules:     Streamly.Atomics
+                   , Streamly.Time.Units
+                   , Streamly.Time.Clock
+                   , Streamly.SVar
                    , Streamly.Streams.StreamK.Type
                    , Streamly.Streams.StreamK
                    , Streamly.Streams.StreamD.Type
@@ -562,7 +605,6 @@ executable nano-bench
        -- concurrency
        , atomic-primops    >= 0.8   && < 0.9
        , lockfree-queue    >= 0.2.3 && < 0.3
-       , clock             >= 0.7.1 && < 0.8
 
        , exceptions        >= 0.8   && < 0.11
        , monad-control     >= 1.0   && < 2
@@ -591,7 +633,7 @@ executable chart
   default-language: Haskell2010
   hs-source-dirs: benchmark
   main-is: Chart.hs
-  if flag(dev)
+  if flag(dev) && !flag(no-charts) && !impl(ghcjs)
     buildable: True
     build-Depends:
         base >= 4.8 && < 5
@@ -609,7 +651,8 @@ executable SearchQuery
   default-language: Haskell2010
   main-is: SearchQuery.hs
   hs-source-dirs:  examples
-  if flag(examples) || flag(examples-sdl)
+  ghc-options: -Wall
+  if (flag(examples) || flag(examples-sdl)) && !impl(ghcjs)
     buildable: True
     build-Depends:
         streamly
@@ -622,6 +665,7 @@ executable ListDir
   default-language: Haskell2010
   main-is: ListDir.hs
   hs-source-dirs:  examples
+  ghc-options: -Wall
   if flag(examples) || flag(examples-sdl)
     buildable: True
     build-Depends:
@@ -638,6 +682,7 @@ executable MergeSort
   default-language: Haskell2010
   main-is: MergeSort.hs
   hs-source-dirs:  examples
+  ghc-options: -Wall
   if flag(examples) || flag(examples-sdl)
     buildable: True
     build-Depends:
@@ -651,6 +696,7 @@ executable AcidRain
   default-language: Haskell2010
   main-is: AcidRain.hs
   hs-source-dirs:  examples
+  ghc-options: -Wall
   if flag(examples) || flag(examples-sdl)
     buildable: True
     build-Depends:
@@ -668,6 +714,7 @@ executable CirclingSquare
   default-language: Haskell2010
   main-is: CirclingSquare.hs
   hs-source-dirs:  examples
+  ghc-options: -Wall
   if flag(examples-sdl)
     buildable: True
     build-Depends:
@@ -681,6 +728,7 @@ executable ControlFlow
   default-language: Haskell2010
   main-is: ControlFlow.hs
   hs-source-dirs:  examples
+  ghc-options: -Wall
   if flag(examples) || flag(examples-sdl)
     buildable: True
     build-Depends:
diff --git a/test/MaxRate.hs b/test/MaxRate.hs
index dc4c4f6..d66061b 100644
--- a/test/MaxRate.hs
+++ b/test/MaxRate.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts #-}
 
 import Streamly
@@ -25,41 +26,66 @@ toMicroSecs x = x * 10^(6 :: Int)
 measureRate' :: IsStream t
     => String
     -> (t IO Int -> SerialT IO Int)
-    -> Double
+    -> Int -- buffers
+    -> Int -- threads
+    -> Either Double Int  -- either rate or count of actions
     -> Int
     -> (Double, Double)
     -> (Double, Double)
     -> Spec
-measureRate' desc t rval consumerDelay producerDelay dur =
-    it (desc <> " rate: " <> show rval
+measureRate' desc t buffers threads rval consumerDelay producerDelay expectedRange = do
+
+    let threadAction =
+            case rval of
+                Left r -> S.take (round $ 10 * r) . S.repeatM
+                Right n -> S.replicateM n
+
+        rateDesc = case rval of
+            Left r ->  " rate: " <> show r
+            Right n -> " count: " <> show n
+
+    it (desc <> rateDesc
+             <> " buffers: " <> show buffers
+             <> " threads: " <> show threads
              <> ", consumer latency: " <> show consumerDelay
              <> ", producer latency: " <> show producerDelay)
-    $ durationShouldBe dur $
-        runStream
-            $ (if consumerDelay > 0
-              then S.mapM $ \x ->
-                        threadDelay (toMicroSecs consumerDelay) >> return x
-              else id)
-            $ t
-            $ maxBuffer  (-1)
-            $ maxThreads (-1)
-            $ avgRate rval
-            $ S.take  (round $ rval * 10)
-            $ S.repeatM $ do
-                let (t1, t2) = producerDelay
-                r <- if t1 == t2
-                     then return $ round $ toMicroSecs t1
-                     else randomRIO ( round $ toMicroSecs t1
-                                    , round $ toMicroSecs t2)
-                when (r > 0) $ -- do
-                    -- t1 <- getTime Monotonic
-                    threadDelay r
-                    -- t2 <- getTime Monotonic
-                    -- let delta = fromIntegral (toNanoSecs (t2 - t1)) / 1000000000
-                    -- putStrLn $ "delay took: " <> show delta
-                    -- when (delta > 2) $ do
-                    --     putStrLn $ "delay took high: " <> show delta
-                return 1
+        $ durationShouldBe expectedRange $
+            runStream
+                $ (if consumerDelay > 0
+                  then S.mapM $ \x ->
+                            threadDelay (toMicroSecs consumerDelay) >> return x
+                  else id)
+                $ t
+                $ maxBuffer  buffers
+                $ maxThreads threads
+                $ (case rval of {Left r -> avgRate r; Right _ -> rate Nothing})
+                $ threadAction $ do
+                    let (t1, t2) = producerDelay
+                    r <- if t1 == t2
+                         then return $ round $ toMicroSecs t1
+                         else randomRIO ( round $ toMicroSecs t1
+                                        , round $ toMicroSecs t2)
+                    when (r > 0) $ -- do
+                        -- t1 <- getTime Monotonic
+                        threadDelay r
+                        -- t2 <- getTime Monotonic
+                        -- let delta = fromIntegral (toNanoSecs (t2 - t1)) / 1000000000
+                        -- putStrLn $ "delay took: " <> show delta
+                        -- when (delta > 2) $ do
+                        --     putStrLn $ "delay took high: " <> show delta
+                    return 1
+
+measureRateVariable :: IsStream t
+    => String
+    -> (t IO Int -> SerialT IO Int)
+    -> Double
+    -> Int
+    -> (Double, Double)
+    -> (Double, Double)
+    -> Spec
+measureRateVariable desc t rval consumerDelay producerDelay dur =
+    measureRate' desc t (-1) (-1) (Left rval)
+                 consumerDelay producerDelay dur
 
 measureRate :: IsStream t
     => String
@@ -71,47 +97,119 @@ measureRate :: IsStream t
     -> Spec
 measureRate desc t rval consumerDelay producerDelay dur =
     let d = fromIntegral producerDelay
-    in measureRate' desc t rval consumerDelay (d, d) dur
+    in measureRateVariable desc t rval consumerDelay (d, d) dur
+
+measureThreads :: IsStream t
+    => String
+    -> (t IO Int -> SerialT IO Int)
+    -> Int -- threads
+    -> Int -- count of actions
+    -> Spec
+measureThreads desc t threads count = do
+    let expectedTime =
+            if threads < 0
+            then 1.0
+            else fromIntegral count / fromIntegral threads
+        duration = (expectedTime * 0.9, expectedTime * 1.1)
+    measureRate' desc t (-1) threads (Right count) 0 (1,1) duration
+
+measureBuffers :: IsStream t
+    => String
+    -> (t IO Int -> SerialT IO Int)
+    -> Int -- buffers
+    -> Int -- count of actions
+    -> Spec
+measureBuffers desc t buffers count = do
+    let expectedTime =
+            if buffers < 0
+            then 1.0
+            else fromIntegral count / fromIntegral buffers
+        duration = (expectedTime * 0.9, expectedTime * 1.1)
+    measureRate' desc t buffers (-1) (Right count) 0 (1,1) duration
 
 main :: IO ()
 main = hspec $ do
+
+    describe "maxBuffers" $ do
+        measureBuffers "asyncly" asyncly (-1) 5
+        -- XXX this test fails due to a known issue
+        -- measureBuffers "maxBuffers" asyncly 1 5
+        measureBuffers "asyncly" asyncly 5 5
+
+    describe "maxThreads" $ do
+        measureThreads "asyncly" asyncly (-1) 5
+        measureThreads "asyncly" asyncly 1 5
+        measureThreads "asyncly" asyncly 5 5
+
+        measureThreads "aheadly" aheadly (-1) 5
+        measureThreads "aheadly" aheadly 1 5
+        measureThreads "aheadly" aheadly 5 5
+
     let range = (8,12)
 
     -- Note that because after the last yield we don't wait, the last period
     -- will be effectively shorter. This becomes significant when the rates are
     -- lower (1 or lower). For rate 1 we lose 1 second in the end and for rate
     -- 10 0.1 second.
-    let rates = [1, 10, 100, 1000, 10000, 100000, 1000000]
+    let rates = [1, 10, 100, 1000, 10000
+#ifndef __GHCJS__
+                , 100000, 1000000
+#endif
+                ]
      in describe "asyncly no consumer delay no producer delay" $
             forM_ rates (\r -> measureRate "asyncly" asyncly r 0 0 range)
 
     -- XXX try staggering the dispatches to achieve higher rates
-    let rates = [1, 10, 100, 1000, 10000, 25000]
+    let rates = [1, 10, 100, 1000
+#ifndef __GHCJS__
+                , 10000, 25000
+#endif
+                ]
      in describe "asyncly no consumer delay and 1 sec producer delay" $
             forM_ rates (\r -> measureRate "asyncly" asyncly r 0 1 range)
 
     -- At lower rates (1/10) this is likely to vary quite a bit depending on
     -- the spread of random producer latencies generated.
-    let rates = [1, 10, 100, 1000, 10000, 25000]
+    let rates = [1, 10, 100, 1000
+#ifndef __GHCJS__
+                , 10000, 25000
+#endif
+                ]
      in describe "asyncly no consumer delay and variable producer delay" $
             forM_ rates $ \r ->
-                measureRate' "asyncly" asyncly r 0 (0.1, 3) range
+                measureRateVariable "asyncly" asyncly r 0 (0.1, 3) range
 
-    let rates = [1, 10, 100, 1000, 10000, 100000, 1000000]
+    let rates = [1, 10, 100, 1000, 10000
+#ifndef __GHCJS__
+                , 100000, 1000000
+#endif
+                ]
      in describe "wAsyncly no consumer delay no producer delay" $
             forM_ rates (\r -> measureRate "wAsyncly" wAsyncly r 0 0 range)
 
-    let rates = [1, 10, 100, 1000, 10000, 25000]
+    let rates = [1, 10, 100, 1000
+#ifndef __GHCJS__
+                , 10000, 25000
+#endif
+                ]
      in describe "wAsyncly no consumer delay and 1 sec producer delay" $
             forM_ rates (\r -> measureRate "wAsyncly" wAsyncly r 0 1 range)
 
-    let rates = [1, 10, 100, 1000, 10000, 100000, 1000000]
+    let rates = [1, 10, 100, 1000, 10000
+#ifndef __GHCJS__
+                , 100000, 1000000
+#endif
+                ]
      in describe "aheadly no consumer delay no producer delay" $
             forM_ rates (\r -> measureRate "aheadly" aheadly r 0 0 range)
 
     -- XXX after the change to stop workers when the heap is clearing
     -- thi does not work well at a 25000 ops per second, need to fix.
-    let rates = [1, 10, 100, 1000, 10000, 12500]
+    let rates = [1, 10, 100, 1000
+#ifndef __GHCJS__
+                , 10000, 12500
+#endif
+                ]
      in describe "aheadly no consumer delay and 1 sec producer delay" $
             forM_ rates (\r -> measureRate "aheadly" aheadly r 0 1 range)