configure.in 38.9 KB
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dnl == autoconf source for the Glasgow FP tools ==
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dnl (run "grep '^dnl \*' configure.in | sed -e 's/dnl / /g; s/\*\*/   +/g;'"
dnl  (or some such) to see the outline of this file)
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dnl
#
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# (c) The AQUA Project, Glasgow University, 1994-1998
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#
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# Configure script template for the Glasgow functional programming tools
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#
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# Process with 'autoconf' to get a working configure script.
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#
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# For the generated configure script, do "./configure --help" to
# see what flags are available. (Better yet, read the documentation!)
#

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# First off, a distrib sanity check..
AC_INIT(mk/config.mk.in)
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dnl * We require autoconf version 2.53 due to the use of AC_SYS_LARGEFILE
AC_PREREQ(2.52)

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dnl * Declare subdirectories that have a private configure script
dnl
dnl After the toplevel configuration is complete, the script will recurse into
dnl these subdirectories (the use of cache values makes repeated checks cheap)
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dnl (We probably have to add hslibs/{OpenGL,GLUT} here later...)
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AC_CONFIG_SUBDIRS(ghc)

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# -------------------------------------------------------------------------
# Prepare to generate the following header files
#
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#
AC_CONFIG_HEADER(mk/config.h)
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# No, semi-sadly, we don't do `--srcdir'...
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if test x"$srcdir" != 'x.' ; then
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    echo "This configuration does not support the \`--srcdir' option.."
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    exit 1
fi

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#
# Remove common automounter nonsense + convert from UNC to DOS style paths
# (UNC awareness isn't quite there yet for cygwin32-beta18 and consituent tools.)
#
hardtop=`pwd`
hardtop=`echo $hardtop | sed 's|^/tmp_mnt.*\(/local/.*\)$|\1|' | sed 's|^/tmp_mnt/|/|' | sed 's|^/grasp_tmp|/local/grasp_tmp|' | sed 's|^//\(.\)/|\1:/|' `

echo ''
echo "*** The top of your build tree is: $hardtop"
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# subst of hardtop is done below after we've computed hardtop_plat.
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dnl--------------------------------------------------------------------
dnl * Choose host(/target/build) platform
dnl--------------------------------------------------------------------

dnl Guess host/target/build platform(s) if necessary.
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AC_CANONICAL_SYSTEM
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# "$host" defaults to "$target"
if test "x$host" = xNONE ; then
    host=$target
fi

dnl ** canonicalize platform names
BuildPlatform=`/bin/sh $srcdir/config.sub $build` || exit 1
HostPlatform=`/bin/sh $srcdir/config.sub $host` || exit 1
TargetPlatform=`/bin/sh $srcdir/config.sub $target` || exit 1

if test x"$TargetPlatform" != x"$HostPlatform" ; then
    echo "GHC configuration does not support differing host/target (i.e., cross-compiling)"
    exit 1
fi
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exeext=''
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#
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# The following will be more difficult when we *are* cross-compiling.
# Suitable names to slam in *_CPP are in platform.h.in.
# We also record the architecture, vendor, and operating system (OS)
# separately.
case $HostPlatform in
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alpha*-dec-osf[[12]]*)
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	HostPlatform=alpha-dec-osf1   # canonicalise for our purposes
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	TargetPlatform=alpha-dec-osf1 # this will work for now... (hack)
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	BuildPlatform=alpha-dec-osf1  # hack
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        HostPlatform_CPP='alpha_dec_osf1'
        HostArch_CPP='alpha'
        HostVendor_CPP='dec'
        HostOS_CPP='osf1'
        ;;
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alpha*-dec-osf[[345]]*)
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	HostPlatform=alpha-dec-osf3   # canonicalise for our purposes
	TargetPlatform=alpha-dec-osf3 # this will work for now... (hack)
	BuildPlatform=alpha-dec-osf3  # hack
        HostPlatform_CPP='alpha_dec_osf3'
        HostArch_CPP='alpha'
        HostVendor_CPP='dec'
        HostOS_CPP='osf3'
        ;;
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alpha*-unknown-linux)
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	HostPlatform=alpha-unknown-linux
	TargetPlatform=alpha-unknown-linux
	BuildPlatform=alpha-unknown-linux
        HostPlatform_CPP='alpha_unknown_linux'
        HostArch_CPP='alpha'
        HostVendor_CPP='unknown'
        HostOS_CPP='linux'
        ;;
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alpha*-unknown-freebsd*)
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	HostPlatform=alpha-unknown-freebsd
	TargetPlatform=alpha-unknown-freebsd
	BuildPlatform=alpha-unknown-freebsd
        HostPlatform_CPP='alpha_unknown_freebsd'
        HostArch_CPP='alpha'
        HostVendor_CPP='unknown'
        HostOS_CPP='freebsd'
        ;;
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hppa1.1-hp-hpux*)
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	HostPlatform=hppa1.1-hp-hpux  # canonicalise for our purposes (hack)
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	TargetPlatform=hppa1.1-hp-hpux
	BuildPlatform=hppa1.1-hp-hpux
        HostPlatform_CPP='hppa1_1_hp_hpux'
        HostArch_CPP='hppa1_1'
        HostVendor_CPP='hp'
        HostOS_CPP='hpux'
        ;;
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i[[3456]]86-*-linuxaout*)
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	HostPlatform=i386-unknown-linuxaout   # hack again
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	TargetPlatform=i386-unknown-linuxaout
	BuildPlatform=i386-unknown-linuxaout
        HostPlatform_CPP='i386_unknown_linuxaout'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='linuxaout'
        ;;
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i[[3456]]86-*-linux*)
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	HostPlatform=i386-unknown-linux # hack again
	TargetPlatform=i386-unknown-linux
	BuildPlatform=i386-unknown-linux
        HostPlatform_CPP='i386_unknown_linux'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='linux'
        ;;
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i[[3456]]86-*-freebsd[[3-9]]*) # FreeBSD 3.0+ uses ELF
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	HostPlatform=i386-unknown-freebsd # hack again
	TargetPlatform=i386-unknown-freebsd
	BuildPlatform=i386-unknown-freebsd
        HostPlatform_CPP='i386_unknown_freebsd'
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        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
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        HostOS_CPP='freebsd'
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        ;;
i[[3456]]86-*-freebsd2*) # Older FreeBSDs are a.out
	HostPlatform=i386-unknown-freebsd2 # hack again
	TargetPlatform=i386-unknown-freebsd2
	BuildPlatform=i386-unknown-freebsd2
        HostPlatform_CPP='i386_unknown_freebsd2'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='freebsd2'
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        ;;
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i[[3456]]86-*-netbsd*)
	HostPlatform=i386-unknown-netbsd # hack again
	TargetPlatform=i386-unknown-netbsd
	BuildPlatform=i386-unknown-netbsd
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        HostPlatform_CPP='i386_unknown_netbsd'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='netbsd'
        ;;
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i[[3456]]86-*-openbsd*)
	HostPlatform=i386-unknown-openbsd # hack again
	TargetPlatform=i386-unknown-openbsd
	BuildPlatform=i386-unknown-openbsd
        HostPlatform_CPP='i386_unknown_openbsd'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='openbsd'
        ;;
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i[[3456]]86-*-solaris2*)
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	HostPlatform=i386-unknown-solaris2 # hack again
	TargetPlatform=i386-unknown-solaris2
	BuildPlatform=i386-unknown-solaris2
        HostPlatform_CPP='i386_unknown_solaris2'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='solaris2'
        ;;
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i[[3456]]86-*-cygwin*)
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	HostPlatform=i386-unknown-cygwin32 # hack again
	TargetPlatform=i386-unknown-cygwin32
	BuildPlatform=i386-unknown-cygwin32
        HostPlatform_CPP='i386_unknown_cygwin32'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='cygwin32'
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	exeext='.exe'
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        ;;
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i[[3456]]86-*-mingw32*)
	HostPlatform=i386-unknown-mingw32 # hack again
	TargetPlatform=i386-unknown-mingw32
	BuildPlatform=i386-unknown-mingw32
        HostPlatform_CPP='i386_unknown_mingw32'
        HostArch_CPP='i386'
        HostVendor_CPP='unknown'
        HostOS_CPP='mingw32'
	exeext='.exe'
        ;;
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ia64-*-linux*)
        HostPlatform=ia64-unknown-linux # hack again
        TargetPlatform=ia64-unknown-linux
        BuildPlatform=ia64-unknown-linux
        HostPlatform_CPP='ia64_unknown_linux'
        HostArch_CPP='ia64'
        HostVendor_CPP='unknown'
        HostOS_CPP='linux'
        ;;
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m68k-next-nextstep2)
        HostPlatform_CPP='m68k_next_nextstep2'
        HostArch_CPP='m68k'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep2'
        ;;
m68k-next-nextstep3)
        HostPlatform_CPP='m68k_next_nextstep3'
        HostArch_CPP='m68k'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep3'
        ;;
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i[[3456]]86-next-nextstep3)
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	HostPlatform=i386-next-nextstep3 # hack again
	TargetPlatform=i386-next-nextstep3
	BuildPlatform=i386-next-nextstep3
        HostPlatform_CPP='i386_next_nextstep3'
        HostArch_CPP='i386'
        HostVendor_CPP='next'
        HostOS_CPP='nextstep3'
        ;;
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m68k-*-openbsd*)
	HostPlatform=m68k-unknown-openbsd
	TargetPlatform=m68k-unknown-openbsd
	BuildPlatform=m68k-unknown-openbsd
        HostPlatform_CPP='m68k_unknown_openbsd'
        HostArch_CPP='m68k'
        HostVendor_CPP='unknown'
        HostOS_CPP='openbsd'
        ;;
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m68k-apple-netbsd*)
	HostPlatform=m68k-apple-netbsd
	TargetPlatform=m68k-apple-netbsd
	BuildPlatform=m68k-apple-netbsd
        HostPlatform_CPP='m68k_apple_netbsd'
        HostArch_CPP='m68k'
        HostVendor_CPP='apple'
        HostOS_CPP='netbsd'
        ;;
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m68k-sun-sunos4*)
	HostPlatform=m68k-sun-sunos4
	TargetPlatform=m68k-sun-sunos4 #hack
	BuildPlatform=m68k-sun-sunos4 #hack
        HostPlatform_CPP='m68k_sun_sunos4'
        HostArch_CPP='m68k'
        HostVendor_CPP='sun'
        HostOS_CPP='sunos4'
        ;;
mips-dec-ultrix*)
        HostPlatform_CPP='mips_dec_ultrix'
        HostArch_CPP='mipsel'   # NB a little different
        HostVendor_CPP='dec'
        HostOS_CPP='ultrix'
        ;;
mips-sgi-irix*)
	HostPlatform=mips-sgi-irix
	TargetPlatform=mips-sgi-irix #hack
	BuildPlatform=mips-sgi-irix #hack
        HostPlatform_CPP='mips_sgi_irix'
        HostArch_CPP='mipseb'   # NB a little different
        HostVendor_CPP='sgi'
        HostOS_CPP='irix'
        ;;
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rs6000-ibm-aix*)
	HostPlatform=rs6000-ibm-aix
	TargetPlatform=rs6000-ibm-aix #hack
	BuildPlatform=rs6000-ibm-aix #hack
        HostPlatform_CPP='rs6000_ibm_aix'
        HostArch_CPP='rs6000'
        HostVendor_CPP='ibm'
        HostOS_CPP='aix'
        ;;
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powerpc-ibm-aix*)
	HostPlatform=powerpc-ibm-aix
	TargetPlatform=powerpc-ibm-aix #hack
	BuildPlatform=powerpc-ibm-aix #hack
        HostPlatform_CPP='powerpc_ibm_aix'
        HostArch_CPP='powerpc'
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        HostVendor_CPP='ibm'
        HostOS_CPP='aix'
        ;;
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powerpc-apple-darwin*)
	HostPlatform=powerpc-apple-darwin
	TargetPlatform=powerpc-apple-darwin #hack
	BuildPlatform=powerpc-apple-darwin #hack
	HostPlatform_CPP='powerpc_apple_darwin'
	HostArch_CPP='powerpc'
	HostVendor_CPP='apple'
	HostOS_CPP='darwin'
	;;
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sparc-sun-sunos4*)
	HostPlatform=sparc-sun-sunos4
	TargetPlatform=sparc-sun-sunos4 #hack
	BuildPlatform=sparc-sun-sunos4 #hack
        HostPlatform_CPP='sparc_sun_sunos4'
        HostArch_CPP='sparc'
        HostVendor_CPP='sun'
        HostOS_CPP='sunos4'
        ;;
sparc-sun-solaris2*)
	HostPlatform=sparc-sun-solaris2
	TargetPlatform=sparc-sun-solaris2 #hack
	BuildPlatform=sparc-sun-solaris2 #hack
        HostPlatform_CPP='sparc_sun_solaris2'
        HostArch_CPP='sparc'
        HostVendor_CPP='sun'
        HostOS_CPP='solaris2'
        ;;
*)
        echo "Unrecognised platform: $HostPlatform"
        exit 1
        ;;
esac
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echo "Canonicalised to: $HostPlatform"
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test  x"$HostPlatform" != x"$TargetPlatform" && echo "Target platform set to $TargetPlatform"
test  x"$BuildPlatform" != x"$HostPlatform"  && echo "Build platform set to $BuildPlatform"
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BuildPlatform_CPP=$HostPlatform_CPP
TargetPlatform_CPP=$HostPlatform_CPP
BuildArch_CPP=$HostArch_CPP
TargetArch_CPP=$HostArch_CPP
BuildOS_CPP=$HostOS_CPP
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HostOS_Full=$host_os
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TargetOS_CPP=$HostOS_CPP
BuildVendor_CPP=$HostVendor_CPP
TargetVendor_CPP=$HostVendor_CPP
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dnl Cannot afford all these SUBSTs (because of braindead seds w/ 99 cmd limits)
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dnl AC_SUBST(BuildPlatform)
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AC_SUBST(HostPlatform)
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AC_SUBST(TargetPlatform)
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AC_SUBST(HostPlatform_CPP)
dnl AC_SUBST(BuildPlatform_CPP)
dnl AC_SUBST(TargetPlatform_CPP)
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AC_SUBST(HostArch_CPP)
dnl AC_SUBST(BuildArch_CPP)
dnl AC_SUBST(TargetArch_CPP)
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AC_SUBST(HostOS_CPP)
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AC_SUBST(HostOS_Full)
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dnl AC_SUBST(BuildOS_CPP)
dnl AC_SUBST(TargetOS_CPP)
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AC_SUBST(HostVendor_CPP)
dnl AC_SUBST(BuildVendor_CPP)
dnl AC_SUBST(TargetVendor_CPP)

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AC_SUBST(exeext)

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#
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# The native format for 'hardtop' (i.e., right kind of slashes on a Win32 box).
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# (but with b-slashes being escaped).
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case $HostPlatform in
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  i386-unknown-mingw32 | i386-unknown-cygwin32)
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  	# get rid off /cygdrive/ prefix
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	hardtop=`echo ${hardtop} | sed -e 's%^/cygdrive/\(.\)/%\1:/%' `
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  	hardtop_plat=`cygpath -w ${hardtop} | sed -e 's@\\\\@\\\\\\\\@g' `
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	;;
  *)
  	hardtop_plat=${hardtop}
	;;
esac
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AC_SUBST(hardtop)
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AC_SUBST(hardtop_plat)

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dnl --------------------------------------------------------------
dnl * Project specific configuration options
dnl --------------------------------------------------------------
dnl What follows is a bunch of options that can either be configured
dnl through command line options to the configure script or by
dnl supplying defns in the build tree's mk/build.mk. Having the option to
dnl use either is considered a Feature.

dnl ** What command to use to compile compiler sources ?
dnl --------------------------------------------------------------
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AC_ARG_WITH(ghc,
[  --with-ghc=<haskell compiler>
        Use a command different from 'ghc' to compile GHC-specific Haskell code
	    (including GHC itself).
],
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[ WithGhc="$withval" ],
[ 
  if test "$GHC" = ""; then
    AC_PATH_PROG(GHC,ghc)
  fi
  WithGhc=$GHC
]
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)
AC_SUBST(WithGhc)

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AC_ARG_WITH(hc,
[  --with-hc=<haskell compiler>
        Use a command different from 'ghc' to compile generic Haskell code.
],
[WithHc="$withval"],
[WithHc=$WithGhc]
)
AC_SUBST(WithHc)

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if test "$WithGhc" != ""; then
  FPTOOLS_GHC_VERSION([GhcVersion], [GhcMajVersion], [GhcMinVersion], [GhcPatchLevel])dnl
  AC_SUBST(GhcVersion)dnl
  AC_SUBST(GhcMajVersion)dnl
  AC_SUBST(GhcMinVersion)dnl
  AC_SUBST(GhcPatchLevel)dnl
fi

AC_PATH_PROGS(NHC,nhc nhc98)
AC_PATH_PROG(HBC,hbc)

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dnl ** Which gcc to use?
dnl --------------------------------------------------------------
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AC_ARG_WITH(gcc,
[  --with-gcc=<gcc command>
        Use a different command instead of 'gcc' for the GNU C compiler.
],
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[WhatGccIsCalled="$withval"
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 if test "x$HostPlatform" = "xi386-unknown-mingw32"; then
    # Canonicalise to <drive>:/path/to/gcc
    withval=`cygpath -w ${withval} | sed -e 's@\\\\@/@g' `
 fi;
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 CC="$withval"],
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[WhatGccIsCalled="gcc"]
)
AC_SUBST(WhatGccIsCalled)

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dnl ** Booting from .hc files?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(hc-boot,
[  --enable-hc-boot
        Boot the Glasgow Haskell Compiler from intermediate .hc files.
        (This option is mostly of interest to porters.)
],
[BootingFromHc=YES],
[BootingFromHc=NO]
)
AC_SUBST(BootingFromHc)

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dnl ** Booting from unregisterised .hc files?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(hc-boot-unregisterised,
[  --enable-hc-boot-unregisterised
        With --enable-hc-boot, treat the intermediate .hc files as
        unregisterised rather than registerised code.
        (This option is mostly of interest to porters.)
],
[BootingFromUnregisterisedHc=YES],
[BootingFromUnregisterisedHc=NO]
)
AC_SUBST(BootingFromUnregisterisedHc)

if test "$BootingFromHc" = "NO"; then
if test "$BootingFromUnregisterisedHc" = "YES"; then
AC_MSG_ERROR([--enable-hc-boot-unregisterised requires --enable-hc-boot.])
fi;
fi;

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dnl ** Must have GHC to build GHC, unless --enable-hc-boot is on
if test "$BootingFromHc" = "NO" -a "$WithGhc" = "" -a -d "$srcdir/ghc"; then
AC_MSG_ERROR([GHC is required unless bootstrapping from .hc files.])
fi;
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dnl ** Enable multi-thread friendly RTS?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(threaded-rts,
[  --enable-threaded-rts
        Support better interop with OS threads.
],
[ThreadedRts=YES],
[ThreadedRts=NO]
)
AC_SUBST(ThreadedRts)

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dnl ** Enable the construction of Win32 DLLs?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(win32-dlls,
[  --enable-win32-dlls
        If on a Win32 platform running mingw32/cygwin, enable the
	construction of DLLs containing ghc-compiled code.
],
[
case $HostOS_CPP in
cygwin32) ;;
mingw32)  ;;
*)    echo "Unrecognised win32 platform: $HostPlatform"
      exit 1
      ;;
esac
EnableWin32DLLs=YES
],
[EnableWin32DLLs=NO]
)
AC_SUBST(EnableWin32DLLs)
if test x"$EnableWin32DLLs" = "xYES" ; then
 AC_DEFINE(HAVE_WIN32_DLL_SUPPORT)
fi

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dnl ** Enable the building of the ObjectIO?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(objectio,
[  --enable-objectio
        Build ObjectIO, a portable GUI library for Haskell.
        (This option is only relevant when libraries are built.)
],
[GhcLibsWithObjectIO=YES],
[GhcLibsWithObjectIO=NO]
)
AC_SUBST(GhcLibsWithObjectIO)

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dnl ** Enable the building of the OpenGL/GLUT binding in hslibs?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(hopengl,
[  --enable-hopengl
        Build HOpenGL, a Haskell binding for OpenGL/GLUT, too.
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        (NOTE: Work in progress, currently only GLUT is supported!)
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],
[GhcLibsWithHOpenGL=YES],
[GhcLibsWithHOpenGL=NO]
)
AC_SUBST(GhcLibsWithHOpenGL)

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dnl ** .NET interop support?
dnl --------------------------------------------------------------
AC_ARG_ENABLE(dotnet,
[  --enable-dotnet
        Build .NET interop layer.
],
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[DotnetSupport=YES; AC_DEFINE(WANT_DOTNET_SUPPORT)],
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[DotnetSupport=NO]
)
AC_SUBST(DotnetSupport)

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dnl --------------------------------------------------------------
dnl End of configure script option section
dnl --------------------------------------------------------------


dnl --------------------------------------------------------------
dnl * General configuration checks
dnl --------------------------------------------------------------
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dnl ** does #! work?
AC_SYS_INTERPRETER()
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dnl ** look for `perl', but only in /bin on Windows
case $HostOS_CPP in
cygwin32|mingw32)
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      AC_CHECK_PROG(PerlCmd,perl,/bin/perl,,/bin)
      if test -z "$PerlCmd"; then
         echo "You must install the version of Perl shipped with GHC"
         echo "(or a compatible one) in /bin."
         exit 1
      fi
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   ;;
*)
   AC_PATH_PROG(PerlCmd,perl)
   if test -z "$PerlCmd"; then
      echo "You must install perl before you can continue"
      echo "Perhaps it is already installed, but not in your PATH?"
      exit 1
   else
   FPTOOLS_CHECK_PERL_VERSION
   fi
   ;;
esac
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dnl ** does #! path/to/perl work? (sometimes it's too long...)
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FPTOOLS_SHEBANG_PERL
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dnl ** check for Python
AC_PATH_PROG(PythonCmd,python)

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dnl ** look for GCC and find out which version
dnl     Figure out which C compiler to use.  Gcc is preferred.
dnl     If gcc, make sure it's at least 2.1
dnl
AC_PROG_CC
FPTOOLS_HAVE_GCC
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FPTOOLS_GCC_NEEDS_NO_OMIT_LFPTR
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dnl ** figure out how to invoke cpp directly (gcc -E is no good)
AC_PROG_CPP
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dnl ** Without optimization some INLINE trickery fails for GHCi
SRC_CC_OPTS="-O"

dnl ** Try to add -mno-cygwin to the C compiler options for mingw32 targets
if test x"$TargetOS_CPP" = x"mingw32"; then
  FPTOOLS_CC_FLAG(-mno-cygwin,CC_SUPPORTS_MNO_CYGWIN)
  SRC_CC_OPTS="$CC_SUPPORTS_MNO_CYGWIN $SRC_CC_OPTS"
  CPPFLAGS="$CC_SUPPORTS_MNO_CYGWIN $CPPFLAGS"
fi
AC_SUBST(SRC_CC_OPTS)
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dnl ** figure out how to do context diffs
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FPTOOLS_PROG_DIFF
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dnl ** Find find command (for Win32's benefit)
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FPTOOLS_FIND_FIND
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dnl ** look for a decent parser generator (bison preferred)
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dnl (FPTOOLS_PROG_YACCY is AC_PROG_YACC, but with some extra testing 
dnl  on the suitability of the 'yacc' returned.)
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FPTOOLS_PROG_YACCY
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dnl ** Find lex command (lex or flex) - *doesn't* use autoconf's
dnl    AC_PROG_LEX, since it doesn't actually check whether 'lex'
dnl    exists if 'flex' doesn't.
AC_PROG_LEX_STRICT
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dnl ** figure out how to do a BSD-ish install
AC_PROG_INSTALL
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dnl If you can run configure, you certainly have /bin/sh
AC_DEFINE(HAVE_BIN_SH)

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dnl ** how to invoke `ar' and `ranlib'
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FPTOOLS_PROG_AR_AND_RANLIB
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dnl ** Check to see whether ln -s works
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AC_PROG_LN_S

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dnl ** Find the path to sed
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AC_PATH_PROG(SedCmd,sed)

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dnl ** check for time command
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AC_PATH_PROG(TimeCmd,time)

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dnl ** check for tar
dnl   if GNU tar is named gtar, look for it first.
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AC_PATH_PROGS(TarCmd,gtar tar,tar)
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dnl ** check for gzip/compress
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AC_PATH_PROGS(CompressCmd,gzip compress,gzip)

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dnl ** check for jade/openjade & determine a working catalog
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AC_PATH_PROGS(JadeCmd,openjade jade,jade)
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FPTOOLS_DOCBOOK_CATALOG(Catalog, $JadeCmd, docs/fptools-both.dsl, 
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                        /etc/sgml/catalog /etc/sgml.catalog /usr/share/sgml/CATALOG.docbkdsl /usr/local/share/sgml/catalog glafp-utils/docbook/CATALOG*)
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if test -z "$Catalog"; then
  AC_MSG_RESULT([Warning: You will not be able to build the documentation.])
fi
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case $Catalog in
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   yes) # assume it is provided by other means (e.g., SGML_CATALOG_FILES env var).
        Catalog=
   	;;
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   glafp*) 
	case $HostOS_CPP in
	   mingw32)
	      Catalog=`cygpath -w $hardtop/$Catalog`
	      ;;
	   *) Catalog=$hardtop/$Catalog
	      ;;
	esac
   ;;
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esac   
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AC_SUBST(Catalog)
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compress_nm=`basename $CompressCmd`
if test x"$compress_nm" = xgzip; then
  CompressCmd="$CompressCmd -d"
  CompressSuffix="gz"
else
  CompressSuffix="Z"
fi
AC_SUBST(CompressCmd)
AC_SUBST(CompressSuffix)
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dnl ** check for ghc-pkg command
AC_PATH_PROG(GhcPkgCmd,ghc-pkg)

AC_ARG_WITH(greencard,
[  --with-greencard=<greencard compiler>
        Use a command different from 'green-card' to compile GreenCard files
],
[
GreencardCmd=$withval;
FPTOOLS_GREENCARD(3.00)
]
)

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AC_ARG_ENABLE(src-tree-happy,
[  --enable-src-tree-happy
        Build and use source tree (fptools/happy) version of happy.
],
[UseSrcTreeHappy=YES],
[UseSrcTreeHappy=NO]
)
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dnl ** check for installed happy binary + version
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dnl    (don't do it if we're booting from .hc files though.)
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if test "$BootingFromHc" = "NO"; then
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FPTOOLS_HAPPY
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fi;
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AC_ARG_ENABLE(src-tree-haddock,
[  --enable-src-tree-haddock
        Build and use source tree (fptools/haddock) version of haddock.
],
[UseSrcTreeHaddock=YES],
[UseSrcTreeHaddock=NO]
)
dnl ** check for installed haddock
FPTOOLS_HADDOCK

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dnl --------------------------------------------------
dnl ### program checking section ends here ###
dnl --------------------------------------------------
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dnl --------------------------------------------------
dnl * Platform header file and syscall feature tests
dnl ### checking the state of the local header files and syscalls ###
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dnl ** check for full ANSI header (.h) files
AC_HEADER_STDC
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dnl ** Enable large file support.  NB. do this before testing the type of
dnl    off_t, because it will affect the result of that test.
AC_SYS_LARGEFILE

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dnl ** check for specific header (.h) files that we are interested in
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AC_CHECK_HEADERS(Files.h arpa/inet.h assert.h console.h ctype.h dirent.h errno.h fcntl.h float.h ftw.h grp.h ieee754.h inttypes.h limits.h malloc.h memory.h nlist.h pascal.h pwd.h sgtty.h siginfo.h signal.h stat.h stdint.h stdlib.h stddef.h stdarg.h string.h sys/fault.h sys/file.h sys/ioctl.h sys/limits.h sys/mman.h sys/param.h sys/procfs.h sys/resource.h sys/signal.h sys/socket.h netdb.h netinet/in.h netinet/tcp.h sys/stat.h sys/syscall.h sys/time.h sys/timeb.h sys/timers.h sys/times.h sys/types.h sys/un.h sys/utsname.h sys/vadvise.h sys/wait.h termio.h termios.h time.h types.h unistd.h utime.h values.h vfork.h bfd.h winsock.h pthread.h sys/uio.h)
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AC_CHECK_HEADER(unistd.h,[AC_CHECK_FUNCS(lchown)])
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AC_CHECK_HEADER(readline/readline.h, [HaveReadlineReadlineH=YES], [HaveReadlineReadlineH=NO])
AC_CHECK_HEADER(readline/history.h, [HaveReadlineHistoryH=YES], [HaveReadlineHistoryH=NO])
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if test $HaveReadlineReadlineH = YES && test $HaveReadlineHistoryH = YES ; then
  HaveReadlineHeaders=YES
  AC_DEFINE(HAVE_READLINE_HEADERS,1)
else
  HaveReadlineHeaders=NO
  AC_DEFINE(HAVE_READLINE_HEADERS,0)
fi
AC_SUBST(HaveReadlineHeaders)
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dnl ** check for DOS include files
AC_CHECK_HEADERS(dos.h conio.h io.h std.h) 

dnl ** check for Windows include files
AC_CHECK_HEADERS(windows.h)
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dnl ** check for OpenGL include files
AC_CHECK_HEADERS(GL/gl.h)
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dnl ** check if it is safe to include both <time.h> and <sys/time.h>
AC_HEADER_TIME
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dnl dynamic loading include files
AC_CHECK_HEADERS(dlfcn.h dl.h) 

dnl ** check for farcalloc (in bcc)
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AC_CHECK_HEADER(alloc.h,[AC_CHECK_FUNCS(farcalloc)])
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dnl ** check for valloc (in sunos, solaris, mips, amiga, next, minix, ultrix)
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AC_CHECK_HEADER(malloc.h,[AC_CHECK_FUNCS(valloc)])
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dnl ** check for POSIX regex
HavePosixRegex=NO
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AC_CHECK_HEADER(regex.h,[AC_CHECK_FUNC(regcomp, [HavePosixRegex=YES])])
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AC_SUBST(HavePosixRegex)

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dnl ** how do we get a timezone name, and UTC offset ?
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AC_STRUCT_TIMEZONE
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dnl ** what's the type of timezone?
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FPTOOLS_HAVE_TIMEZONE
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FPTOOLS_TYPE_TIMEZONE
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dnl ** do we have altzone?
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FPTOOLS_ALTZONE
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dnl ** does struct stat contain st_blksize?
AC_STRUCT_ST_BLKSIZE

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dnl ** do we have long longs?
FPTOOLS_C_LONG_LONG

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dnl ** check what fields struct msghdr contains
FPTOOLS_MSGHDR_MSG_ACCRIGHTS
FPTOOLS_MSGHDR_MSG_CONTROL

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dnl ** what are the sizes of various types
dnl    (these must come before GHC_CHECK_ALIGNMENT)
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AC_CHECK_SIZEOF(char,               1)
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AC_CHECK_SIZEOF(double,             8)
AC_CHECK_SIZEOF(float,              4)
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AC_CHECK_SIZEOF(int,                4)
AC_CHECK_SIZEOF(long,               4)
if test "$fptools_cv_have_long_long" = yes; then
AC_CHECK_SIZEOF(long long,          8)
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fi
AC_CHECK_SIZEOF(short,              2)
AC_CHECK_SIZEOF(unsigned char,      1)
AC_CHECK_SIZEOF(unsigned int,       4)
AC_CHECK_SIZEOF(unsigned long,      4)
if test "$fptools_cv_have_long_long" = yes; then
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AC_CHECK_SIZEOF(unsigned long long, 8)
fi
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AC_CHECK_SIZEOF(unsigned short,     2)
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AC_CHECK_SIZEOF(void *,             4)
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dnl ** what are alignment constraints on various types
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FPTOOLS_CHECK_ALIGNMENT(char)
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FPTOOLS_CHECK_ALIGNMENT(double)
FPTOOLS_CHECK_ALIGNMENT(float)
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FPTOOLS_CHECK_ALIGNMENT(int)
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FPTOOLS_CHECK_ALIGNMENT(long)
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if test "$fptools_cv_have_long_long" = yes; then
FPTOOLS_CHECK_ALIGNMENT(long long)
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fi
FPTOOLS_CHECK_ALIGNMENT(short)
FPTOOLS_CHECK_ALIGNMENT(unsigned char)
FPTOOLS_CHECK_ALIGNMENT(unsigned int)
FPTOOLS_CHECK_ALIGNMENT(unsigned long)
if test "$fptools_cv_have_long_long" = yes; then
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FPTOOLS_CHECK_ALIGNMENT(unsigned long long)
fi
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FPTOOLS_CHECK_ALIGNMENT(unsigned short)
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FPTOOLS_CHECK_ALIGNMENT(void *)
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dnl ** map standard C types and ISO types to Haskell types
FPTOOLS_CHECK_HTYPE(char)
FPTOOLS_CHECK_HTYPE(signed char)
FPTOOLS_CHECK_HTYPE(unsigned char)
FPTOOLS_CHECK_HTYPE(short)
FPTOOLS_CHECK_HTYPE(unsigned short)
FPTOOLS_CHECK_HTYPE(int)
FPTOOLS_CHECK_HTYPE(unsigned int)
FPTOOLS_CHECK_HTYPE(long)
FPTOOLS_CHECK_HTYPE(unsigned long)
if test "$fptools_cv_have_long_long" = yes; then
FPTOOLS_CHECK_HTYPE(long long)
FPTOOLS_CHECK_HTYPE(unsigned long long)
fi
FPTOOLS_CHECK_HTYPE(float)
FPTOOLS_CHECK_HTYPE(double)
FPTOOLS_CHECK_HTYPE(ptrdiff_t)
FPTOOLS_CHECK_HTYPE(size_t)
FPTOOLS_CHECK_HTYPE(wchar_t)
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dnl Int32 is a HACK for non-ISO C compilers
FPTOOLS_CHECK_HTYPE(sig_atomic_t, Int32)
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FPTOOLS_CHECK_HTYPE(clock_t)
FPTOOLS_CHECK_HTYPE(time_t)
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FPTOOLS_CHECK_HTYPE(dev_t, Word32)
FPTOOLS_CHECK_HTYPE(ino_t)
FPTOOLS_CHECK_HTYPE(mode_t)
FPTOOLS_CHECK_HTYPE(off_t)
FPTOOLS_CHECK_HTYPE(pid_t)
FPTOOLS_CHECK_HTYPE(gid_t)
FPTOOLS_CHECK_HTYPE(uid_t)
FPTOOLS_CHECK_HTYPE(cc_t)
FPTOOLS_CHECK_HTYPE(speed_t)
FPTOOLS_CHECK_HTYPE(tcflag_t)
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FPTOOLS_CHECK_HTYPE(blkcnt_t)
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FPTOOLS_CHECK_HTYPE(nlink_t)
FPTOOLS_CHECK_HTYPE(ssize_t)
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FPTOOLS_CHECK_HTYPE(rlim_t)
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dnl ** Map OpenGL data types to Haskell types
if test $GhcLibsWithHOpenGL = YES ; then
FPTOOLS_CHECK_HTYPE(GLboolean)
FPTOOLS_CHECK_HTYPE(GLbyte)
FPTOOLS_CHECK_HTYPE(GLubyte)
FPTOOLS_CHECK_HTYPE(GLshort)
FPTOOLS_CHECK_HTYPE(GLushort)
FPTOOLS_CHECK_HTYPE(GLint)
FPTOOLS_CHECK_HTYPE(GLuint)
FPTOOLS_CHECK_HTYPE(GLsizei)
FPTOOLS_CHECK_HTYPE(GLenum)
FPTOOLS_CHECK_HTYPE(GLbitfield)
FPTOOLS_CHECK_HTYPE(GLfloat)
FPTOOLS_CHECK_HTYPE(GLclampf)
FPTOOLS_CHECK_HTYPE(GLdouble)
FPTOOLS_CHECK_HTYPE(GLclampd)
fi

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FPTOOLS_CHECK_CCONSTS(E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EADV EAFNOSUPPORT EAGAIN EALREADY EBADF EBADMSG EBADRPC EBUSY ECHILD ECOMM ECONNABORTED ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDIRTY EDOM EDQUOT EEXIST EFAULT EFBIG EFTYPE EHOSTDOWN EHOSTUNREACH EIDRM EILSEQ EINPROGRESS EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK EMSGSIZE EMULTIHOP ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH ENFILE ENOBUFS ENODATA ENODEV ENOENT ENOEXEC ENOLCK ENOLINK ENOMEM ENOMSG ENONET ENOPROTOOPT ENOSPC ENOSR ENOSTR ENOSYS ENOTBLK ENOTCONN ENOTDIR ENOTEMPTY ENOTSOCK ENOTTY ENXIO EOPNOTSUPP EPERM EPFNOSUPPORT EPIPE EPROCLIM EPROCUNAVAIL EPROGMISMATCH EPROGUNAVAIL EPROTO EPROTONOSUPPORT EPROTOTYPE ERANGE EREMCHG EREMOTE EROFS ERPCMISMATCH ERREMOTE ESHUTDOWN ESOCKTNOSUPPORT ESPIPE ESRCH ESRMNT ESTALE ETIME ETIMEDOUT ETOOMANYREFS ETXTBSY EUSERS EWOULDBLOCK EXDEV)

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dnl ** can we open files in binary mode?
FPTOOLS_O_BINARY

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dnl ** check for GetModuleFileName and WinExec (windows only)
dnl Old: AC_CHECK_FUNCS(WinExec GetModuleFileName)       dnl Windows
dnl Doesn't work because the linker can't see the functions if
dnl you omit the #include <windows.h>.  (I've no idea why not...)

FPTOOLS_TRY_LINK_NOWARN(,[
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
main() { 
  WinExec("",0);
  exit(0);
}
],
[have_winexec=1],
[have_winexec=0])
if test "$have_winexec" = "1"; then
AC_DEFINE(HAVE_WINEXEC)
fi

FPTOOLS_TRY_LINK_NOWARN(,[
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
main() { 
  char* dir;
  GetModuleFileName((HMODULE)0,dir,0);
  exit(0);
}
],
[have_getmodulefilename=1],
[have_getmodulefilename=0])
if test "$have_getmodulefilename" = "1"; then
AC_DEFINE(HAVE_GETMODULEFILENAME)
fi

dnl ** check return type of signal handlers
dnl Foo: assumes we can use prototypes.
dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
dnl AC_CACHE_CHECK([type of signal handlers], ac_cv_type_signal_handler,
dnl [AC_TRY_COMPILE([#include <sys/types.h>
dnl #include <signal.h>
dnl #ifdef signal
dnl #undef signal
dnl #endif
dnl void (*signal (int, void (*)(int)))(int);
dnl ],
dnl [int i;], 
dnl ac_cv_type_signal_handler=void_int,
dnl ac_cv_type_signal_handler=int_void)])
dnl if test "$ac_cv_type_signal_handler" = void_int; then
dnl AC_DEFINE(VOID_INT_SIGNALS)
dnl fi

dnl On BCC, signal handlers have type "int(void)", elsewhere its "void(int)".
AC_TYPE_SIGNAL
if test "$ac_cv_type_signal" = void; then
AC_DEFINE(VOID_INT_SIGNALS)
fi

dnl ** check for more functions
AC_CHECK_FUNCS(strcasecmp _stricmp stricmp strcmpi)
AC_CHECK_FUNCS(strcmp)
AC_CHECK_FUNCS(realpath _fullpath)  
AC_CHECK_FUNCS(PBHSetVolSync macsystem)  
AC_CHECK_FUNCS(fgetpos fsetpos fseek ftell)
AC_CHECK_FUNCS(vsnprintf _vsnprintf)
AC_CHECK_FUNCS(snprintf  _snprintf )  
AC_CHECK_FUNCS(popen     _popen )  
AC_CHECK_FUNCS(pclose    _pclose )  
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AC_CHECK_FUNCS(setenv unsetenv)
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dnl ** check for specific library functions that we are interested in
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AC_CHECK_FUNCS(access ftime getclock getpagesize getrusage gettimeofday mktime mprotect readlink setitimer stat lstat symlink sysconf timelocal times vadvise vfork localtime_r gmtime_r readdir_r getgrgid_r getgrnam_r getpwuid_r getpwnam_r)
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dnl ** Solaris2 needs additionl flag for getpw*_r()
case "$TargetPlatform" in
  *-solaris2*)
    unix_SRC_HSC2HS_OPTS="-D_POSIX_PTHREAD_SEMANTICS"
    AC_SUBST(unix_SRC_HSC2HS_OPTS)
  ;;
esac

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AC_CHECK_LIB(gmp,  __gmpz_fdiv_qr, HaveLibGmp=YES; LibGmp=gmp,
  AC_CHECK_LIB(gmp3, __gmpz_fdiv_qr,  HaveLibGmp=YES; LibGmp=gmp3,
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    HaveLibGmp=NO; LibGmp=not-installed))
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AC_SUBST(HaveLibGmp)
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AC_SUBST(LibGmp)
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dnl ** (Mac OS X only: check for HaskellSupport.framework)
HaveFrameworkHaskellSupport=NO
if test $HostPlatform = "powerpc-apple-darwin"; then
 AC_MSG_CHECKING([for HaskellSupport.framework])
 save_libs="$LIBS"
 LIBS="-framework HaskellSupport"
 AC_TRY_LINK_FUNC(__gmpz_fdiv_qr, HaveFrameworkHaskellSupport=YES,)
 if test $HaveFrameworkHaskellSupport = YES; then
  AC_DEFINE(HAVE_FRAMEWORK_HASKELLSUPPORT)
 fi;
 LIBS="$save_libs"
 AC_MSG_RESULT([$HaveFrameworkHaskellSupport])
fi;
AC_SUBST(HaveFrameworkHaskellSupport)

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dnl ** check for mingwex library
AC_CHECK_LIB(mingwex, closedir, HaveLibMingwEx=YES, HaveLibMingwEx=NO)
AC_SUBST(HaveLibMingwEx)

if test $HaveLibMingwEx = YES ; then
  AC_DEFINE(HAVE_MINGWEX)
fi

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if test "$HaveLibGmp" = "NO"; then
if test "$HostArch_CPP" = "ia64"; then
AC_MSG_ERROR([You need to install libgmp (the in-tree version does not work on IA64).])
fi;
fi;

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dnl ** check whether this machine has GNU regex in libc.
FPTOOLS_REGEX_IN_LIBC

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dnl ** check whether this machine has BFD and liberty installed (used for debugging)
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dnl    the order of these tests matters: bfd needs liberty
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AC_CHECK_LIB(iberty, xmalloc)
AC_CHECK_LIB(bfd,    bfd_init)
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dnl ** check for readline, for Hugs and hslibs' Readline
dnl ncurses supersedes termcap and curses, but for compatibility,
dnl we have to check for all...
AC_CHECK_LIB(ncurses, tputs, HaveLibTermcap=YES; LibTermcap=ncurses,
  AC_CHECK_LIB(termcap, tputs, HaveLibTermcap=YES; LibTermcap=termcap,
    AC_CHECK_LIB(curses, tputs, HaveLibTermcap=YES; LibTermcap=curses,
      HaveLibTermcap=NO; LibTermcap=not-installed)))

if test $HaveLibTermcap = YES ; then
  LIBS="-l$LibTermcap $LIBS"
  AC_CHECK_LIB(readline, readline, HaveLibReadline=YES, HaveLibReadline=NO)
fi
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if test $HaveLibTermcap = YES && test x"$HaveLibReadline" = xYES ; then
  AC_DEFINE(HAVE_READLINE_LIBS,1)
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  LibsReadline="readline $LibTermcap"
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else
  AC_DEFINE(HAVE_READLINE_LIBS,0)
  LibsReadline=
fi
AC_SUBST(LibsReadline)
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if test "$HaveLibReadline"; then
  AC_CHECK_LIB(readline, rl_erase_empty_line,
    [AC_DEFINE(HAVE_READLINE_4, 1)],
    [AC_DEFINE(HAVE_READLINE_4, 0)])
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  AC_CHECK_LIB(readline, rl_free_undo_list,
    [AC_DEFINE(HAVE_READLINE_4_2, 1)],
    [AC_DEFINE(HAVE_READLINE_4_2, 0)])
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else
  AC_DEFINE(HAVE_READLINE_4, 0)
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  AC_DEFINE(HAVE_READLINE_4_2, 0)
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fi

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dnl ** check for math library
FPTOOLS_CHECK_LIBM()
AC_SUBST(LIBM)

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dnl ** check for X Window System
AC_PATH_XTRA()
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dnl ** check for OpenGL/GLUT/GLX include paths and libraries
if test $GhcLibsWithHOpenGL = YES ; then
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FPTOOLS_HAVE_OPENGL
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fi
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dnl ################################################################
dnl Check for libraries
dnl ################################################################

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dnl ** check for libdl & RTLD_NEXT

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dnl (Mac OS X only) ... but don't check if we already have the
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if test $HaveFrameworkHaskellSupport = YES; then
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    HaveLibDL=NO
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    HaveRtldNext=NO
    HaveRtldLocal=YES
    AC_DEFINE(HAVE_RTLDLOCAL)
    HaveRtldGlobal=YES
    AC_DEFINE(HAVE_RTLDGLOBAL)
    HaveRtldNow=YES
    AC_DEFINE(HAVE_RTLDNOW)
    AC_SUBST(HaveLibDL)
    AC_SUBST(HaveRtldNext)
    AC_SUBST(HaveRtldLocal)
    AC_SUBST(HaveRtldGlobal)
    AC_SUBST(HaveRtldNow)
else
    AC_CHECK_LIB(dl, dlopen, 
    	[HaveLibDL=YES
    	 AC_DEFINE(HAVE_LIBDL)
    	 LIBS="$LIBS -ldl"], 
    	[HaveLibDL=NO])
    AC_CHECK_FUNCS(dlopen)
    AC_SUBST(HaveLibDL)

    dnl ** sometimes RTLD_NEXT is hidden in #ifdefs we really don't wan to set
    AC_MSG_CHECKING(for RTLD_NEXT from dlfcn.h)
    AC_EGREP_CPP(yes,
    [
     #include <dlfcn.h>
     #ifdef RTLD_NEXT
            yes
     #endif
    ], [
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_RTLDNEXT)
      HaveRtldNext=YES
    ], [
      AC_MSG_RESULT(no)
      HaveRtldNext=NO
      ])    
    AC_SUBST(HaveRtldNext)

    dnl ** RTLD_LOCAL isn't available on cygwin or openbsd
    AC_MSG_CHECKING(for RTLD_LOCAL from dlfcn.h)
    AC_EGREP_CPP(yes,
    [
     #include <dlfcn.h>
     #ifdef RTLD_LOCAL
            yes
     #endif
    ], [
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_RTLDLOCAL)
      HaveRtldLocal=YES
    ], [
      AC_MSG_RESULT(no)
      HaveRtldLocal=NO
      ])    
    AC_SUBST(HaveRtldLocal)

    dnl ** RTLD_GLOBAL isn't available on openbsd
    AC_MSG_CHECKING(for RTLD_GLOBAL from dlfcn.h)
    AC_EGREP_CPP(yes,
    [
     #include <dlfcn.h>
     #ifdef RTLD_GLOBAL
            yes
     #endif
    ], [
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_RTLDGLOBAL)
      HaveRtldGlobal=YES
    ], [
      AC_MSG_RESULT(no)
      HaveRtldGlobal=NO
      ])    
    AC_SUBST(HaveRtldGlobal)

    dnl ** RTLD_NOW isn't available on openbsd
    AC_MSG_CHECKING(for RTLD_NOW from dlfcn.h)
    AC_EGREP_CPP(yes,
    [
     #include <dlfcn.h>
     #ifdef RTLD_NOW
            yes
     #endif
    ], [
      AC_MSG_RESULT(yes)
      AC_DEFINE(HAVE_RTLDNOW)
      HaveRtldNow=YES
    ], [
      AC_MSG_RESULT(no)
      HaveRtldNow=NO
      ])    
    AC_SUBST(HaveRtldNow)
fi
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FPTOOLS_CHECK_LIB_NOWARN(m, atan)
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dnl ---------- usleep ----------
dnl --- stolen from guile configure ---
dnl --- FIXME: /usr/include/unistd.h can't be right?

### On some systems usleep has no return value.  If it does have one,
### we'd like to return it; otherwise, we'll fake it.
AC_CACHE_CHECK([return type of usleep], cv_func_usleep_return_type,
  [AC_EGREP_HEADER(changequote(<, >)<void[      ]+usleep>changequote([, ]),
                   /usr/include/unistd.h,
                   [cv_func_usleep_return_type=void],
                   [cv_func_usleep_return_type=int])])
case "$cv_func_usleep_return_type" in
  "void" )
    AC_DEFINE(USLEEP_RETURNS_VOID, 1,
      [Define if the system headers declare usleep to return void.])
  ;;
esac

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dnl --------------------------------------------------
dnl * test for in_addr_t
dnl --------------------------------------------------
AC_MSG_CHECKING(for in_addr_t in netinet/in.h)
AC_EGREP_HEADER(in_addr_t, netinet/in.h,
 [ AC_DEFINE(HAVE_IN_ADDR_T) AC_MSG_RESULT(yes) ],
 AC_MSG_RESULT(no))

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dnl --------------------------------------------------
dnl * test for Linux sendfile(2)
dnl --------------------------------------------------
AC_MSG_CHECKING(for sendfile in sys/sendfile.h)
AC_EGREP_HEADER(sendfile, sys/sendfile.h,
 [ AC_DEFINE(HAVE_LINUX_SENDFILE) AC_MSG_RESULT(yes) ],
 AC_MSG_RESULT(no))

dnl --------------------------------------------------
dnl * test for BSD sendfile(2)
dnl --------------------------------------------------
AC_MSG_CHECKING(for sendfile in sys/socket.h)
AC_EGREP_HEADER(sendfile, sys/socket.h,
 [ AC_DEFINE(HAVE_BSD_SENDFILE) AC_MSG_RESULT(yes) ],
 AC_MSG_RESULT(no))

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dnl --------------------------------------------------
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dnl * test for GTK+
dnl --------------------------------------------------

AC_PATH_PROGS(GTK_CONFIG, gtk-config gtk12-config)
if test "$GTK_CONFIG" != ""; then
   AC_CACHE_CHECK([for version of GTK+], fptools_cv_gtk_version, [
	fptools_cv_gtk_version=`$GTK_CONFIG --version`
    ])
    GTK_VERSION=$fptools_cv_gtk_version
else
    GTK_VERSION=
fi

case $fptools_cv_gtk_version in
  1.[[23]].*) ;;
  *) AC_MSG_WARN([GTK+ not usable; need at least version 1.2])
     GTK_CONFIG=
     ;;
esac

AC_SUBST(GTK_CONFIG)
AC_SUBST(GTK_VERSION)

dnl --------------------------------------------------
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dnl * Miscellaneous feature tests
dnl --------------------------------------------------

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dnl ** can we get alloca?
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AC_FUNC_ALLOCA
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dnl ** determine whether or not const works
AC_C_CONST
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dnl ** determine whether ANSI-function prototypes work?
AC_C_PROTOTYPES          

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dnl ** are we big endian?
AC_C_BIGENDIAN
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dnl ** check for leading underscores in symbol names
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FPTOOLS_UNDERSCORE
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dnl ** check for ld, and whether ld has -x option
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AC_PATH_PROG(LdCmdRaw, ld)
case $HostOS_CPP in
 mingw32) LdCmd=`cygpath -w ${LdCmdRaw} | sed -e 's@\\\\@/@g' `
 	   ;;
 *) LdCmd=${LdCmdRaw}
    ;;
esac
AC_SUBST(LdCmd)
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AC_MSG_CHECKING([for SIGPOLL])
AC_EGREP_CPP(we_have_sigpoll,
[#include <signal.h>
#ifdef SIGPOLL
we_have_sigpoll
#endif
], AC_DEFINE(HAVE_SIGPOLL) haveSIGPOLL=yes, haveSIGPOLL=no)
AC_MSG_RESULT([$haveSIGPOLL])
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AC_EGREP_CPP(we_have_that_sysconf_thing,
[
#include <unistd.h>
#ifdef _SC_GETGR_R_SIZE_MAX
we_have_that_sysconf_thing
#endif
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],
[AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_SC_GETGR_R_SIZE_MAX)],
[AC_MSG_RESULT([no])])
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AC_EGREP_CPP(we_have_that_sysconf_thing,
[
#include <unistd.h>
#ifdef _SC_GETPW_R_SIZE_MAX
we_have_that_sysconf_thing
#endif
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],
[AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_SC_GETPW_R_SIZE_MAX)],
[AC_MSG_RESULT([no])])
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