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# Extra autoconf macros for the Glasgow fptools
#
# To be a good autoconf citizen, names of local macros have prefixed with FP_ to
# ensure we don't clash with any pre-supplied autoconf ones.
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# FP_EVAL_STDERR(COMMAND)
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# -----------------------
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# Eval COMMAND, save its stderr (without lines resulting from shell tracing)
# into the file conftest.err and the exit status in the variable fp_status.
AC_DEFUN([FP_EVAL_STDERR],
[{ (eval $1) 2>conftest.er1
  fp_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  (exit $fp_status); }[]dnl
])# FP_EVAL_STDERR


# FP_CHECK_FLAG(FLAG, [ACTION-IF-SUPPORTED], [ACTION-IF-NOT-SUPPORTED])
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# ---------------------------------------------------------------------
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# Check to see whether the compiler for the current language supports a
# particular option.
#
# Implementation note: When given an unkown option, GCC issues an warning on
# stderr only, but returns an exit value of 0 nevertheless. Consequently we have
# to check stderr *and* the exit value.
#
# Used by ghc.
AC_DEFUN(FP_CHECK_FLAG,
[AC_LANG_COMPILER_REQUIRE()dnl
AC_LANG_CASE([C],          [fp_compiler="$CC"  m4_pushdef([fp_Flags], [CFLAGS])],
             [C++],        [fp_compiler="$CXX" m4_pushdef([fp_Flags], [CXXFLAGS])],
             [Fortran 77], [fp_compiler="$F77" m4_pushdef([fp_Flags], [FFLAGS])])
m4_pushdef([fp_Cache], [fp_cv_[]fp_Flags[]AS_TR_SH([$1])])[]dnl
AC_CACHE_CHECK([whether $fp_compiler accepts $1], [fp_Cache],
[AC_LANG_CONFTEST([AC_LANG_PROGRAM()])
fp_save_flags="$fp_Flags"
fp_Flags="$fp_Flags $1"
fp_Cache=no
if FP_EVAL_STDERR([$ac_compile conftest.$ac_ext]) >/dev/null; then
  test -s conftest.err || fp_Cache=yes
fi
fp_Flags="$fp_save_flags"
rm -f conftest.err conftest.$ac_ext])
AS_IF([test $fp_Cache = yes], [$2], [$3])[]dnl
m4_popdef([fp_Cache])[]dnl
m4_popdef([fp_Flags])[]dnl
])# FP_CHECK_FLAG


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# FP_PROG_CONTEXT_DIFF
# --------------------
# Figure out how to do context diffs. Sets the output variable ContextDiffCmd.
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#
# Note: NeXTStep thinks diff'ing a file against itself is "trouble".
#
# Used by ghc, glafp-utils/ltx, and glafp-utils/runstdtest.
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AC_DEFUN([FP_PROG_CONTEXT_DIFF],
[AC_CACHE_CHECK([for a working context diff], [fp_cv_context_diff],
[echo foo > conftest1
echo foo > conftest2
fp_cv_context_diff=no
for fp_var in '-C 1' '-c1'
do
  if diff $fp_var conftest1 conftest2 > /dev/null 2>&1; then
    fp_cv_context_diff="diff $fp_var"
    break
  fi
done])
if test x"$fp_cv_context_diff" = xno; then
   AC_MSG_ERROR([cannot figure out how to do context diffs])
fi
AC_SUBST(ContextDiffCmd, [$fp_cv_context_diff])
])# FP_PROG_CONTEXT_DIFF


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# FP_DECL_ALTZONE
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# ---------------
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# Defines HAVE_DECL_ALTZONE to 1 if declared, 0 otherwise.
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#
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# Used by base package.
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AC_DEFUN([FP_DECL_ALTZONE],
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[AC_REQUIRE([AC_HEADER_TIME])dnl
AC_CHECK_HEADERS([sys/time.h])
AC_CHECK_DECLS([altzone], [], [],[#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
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#endif])
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])# FP_DECL_ALTZONE
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# FP_COMPUTE_INT(EXPRESSION, VARIABLE, INCLUDES, IF-FAILS)
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# --------------------------------------------------------
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# Assign VARIABLE the value of the compile-time EXPRESSION using INCLUDES for
# compilation. Execute IF-FAILS when unable to determine the value. Works for
# cross-compilation, too.
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#
# Implementation note: We are lazy and use an internal autoconf macro, but it
# is supported in autoconf versions 2.50 up to the actual 2.57, so there is
# little risk.
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AC_DEFUN([FP_COMPUTE_INT],
[_AC_COMPUTE_INT([$1], [$2], [$3], [$4])[]dnl
])# FP_COMPUTE_INT


# FP_CHECK_ALIGNMENT(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
# ------------------------------------------------------------------
# A variation of AC_CHECK_SIZEOF for computing the alignment restrictions of a
# given type. Defines ALIGNMENT_TYPE.
AC_DEFUN([FP_CHECK_ALIGNMENT],
[AS_LITERAL_IF([$1], [],
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               [AC_FATAL([$0: requires literal arguments])])[]dnl
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AC_CHECK_TYPE([$1], [], [], [$3])[]dnl
m4_pushdef([fp_Cache], [AS_TR_SH([fp_cv_alignment_$1])])[]dnl
AC_CACHE_CHECK([alignment of $1], [fp_Cache],
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[if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
  FP_COMPUTE_INT([(long) (&((struct { char c; $1 ty; } *)0)->ty)],
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                 [fp_Cache],
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                 [AC_INCLUDES_DEFAULT([$3])],
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                 [AC_MSG_ERROR([cannot compute alignment ($1)
See `config.log' for more details.], [77])])
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else
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  fp_Cache=0
fi])[]dnl
AC_DEFINE_UNQUOTED(AS_TR_CPP(alignment_$1), $fp_Cache, [The alignment of a `$1'.])[]dnl
m4_popdef([fp_Cache])[]dnl
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])# FP_CHECK_ALIGNMENT


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# FP_CHECK_CONST(EXPRESSION, [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
# -------------------------------------------------------------------------------
# Defines CONST_EXPRESSION to the value of the compile-time EXPRESSION, using
# INCLUDES. If the value cannot be determined, use VALUE-IF-FAIL.
AC_DEFUN([FP_CHECK_CONST],
[AS_VAR_PUSHDEF([fp_Cache], [fp_cv_const_$1])[]dnl
AC_CACHE_CHECK([value of $1], fp_Cache,
[FP_COMPUTE_INT([$1], fp_check_const_result, [AC_INCLUDES_DEFAULT([$2])],
                [fp_check_const_result=m4_default([$3], ['-1'])])
AS_VAR_SET(fp_Cache, [$fp_check_const_result])])[]dnl
AC_DEFINE_UNQUOTED(AS_TR_CPP([CONST_$1]), AS_VAR_GET(fp_Cache), [The value of $1.])[]dnl
AS_VAR_POPDEF([fp_Cache])[]dnl
])# FP_CHECK_CONST


# FP_CHECK_CONSTS_TEMPLATE(EXPRESSION...)
# ---------------------------------------
# autoheader helper for FP_CHECK_CONSTS
m4_define([FP_CHECK_CONSTS_TEMPLATE],
[AC_FOREACH([fp_Const], [$1],
  [AH_TEMPLATE(AS_TR_CPP(CONST_[]fp_Const),
               [The value of ]fp_Const[.])])[]dnl
])# FP_CHECK_CONSTS_TEMPLATE


# FP_CHECK_CONSTS(EXPRESSION..., [INCLUDES = DEFAULT-INCLUDES], [VALUE-IF-FAIL = -1])
# -----------------------------------------------------------------------------------
# List version of FP_CHECK_CONST
AC_DEFUN(FP_CHECK_CONSTS,
[FP_CHECK_CONSTS_TEMPLATE([$1])dnl
for fp_const_name in $1
do
FP_CHECK_CONST([$fp_const_name], [$2], [$3])
done
])# FP_CHECK_CONSTS


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# FP_LEADING_UNDERSCORE
# ---------------------
# Test for determining whether symbol names have a leading underscore. We assume
# that they _haven't_ if anything goes wrong. Sets the output variable
# LeadingUnderscore to YES or NO and defines LEADING_UNDERSCORE correspondingly.
#
# Some nlist implementations seem to try to be compatible by ignoring a leading
# underscore sometimes (eg. FreeBSD). We therefore have to work around this by
# checking for *no* leading underscore first. Sigh.  --SDM
#
# Similarly on OpenBSD, but this test doesn't help. -- dons
AC_DEFUN([FP_LEADING_UNDERSCORE],
[AC_CHECK_LIB([elf], [nlist], [LIBS="-lelf $LIBS"])
AC_CACHE_CHECK([leading underscore in symbol names], [fptools_cv_leading_underscore], [
# Hack!: nlist() under Digital UNIX insist on there being an _,
# but symbol table listings shows none. What is going on here?!?
#
# Another hack: cygwin doesn't come with nlist.h , so we hardwire
# the underscoredness of that "platform"
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case $HostPlatform in
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*openbsd*) # x86 openbsd is ELF from 3.4 >, meaning no leading uscore
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  case $build in
    i386-*2\.@<:@0-9@:>@ | i386-*3\.@<:@0-3@:>@ ) fptools_cv_leading_underscore=yes ;;
    *) fptools_cv_leading_underscore=no ;;
  esac ;;
alpha-dec-osf*) fptools_cv_leading_underscore=no;;
*cygwin32) fptools_cv_leading_underscore=yes;;
*mingw32) fptools_cv_leading_underscore=yes;;
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*) AC_RUN_IFELSE([AC_LANG_SOURCE([[#ifdef HAVE_NLIST_H
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#include <nlist.h>
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struct nlist xYzzY1[] = {{"xYzzY1", 0},{0}};
struct nlist xYzzY2[] = {{"_xYzzY2", 0},{0}};
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#endif

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int main(argc, argv)
int argc;
char **argv;
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{
#ifdef HAVE_NLIST_H
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    if(nlist(argv[0], xYzzY1) == 0 && xYzzY1[0].n_value != 0)
        exit(1);
    if(nlist(argv[0], xYzzY2) == 0 && xYzzY2[0].n_value != 0)
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        exit(0);
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#endif
    exit(1);
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}]])],[fptools_cv_leading_underscore=yes],[fptools_cv_leading_underscore=no],[fptools_cv_leading_underscore=no])
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;;
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esac]);
AC_SUBST([LeadingUnderscore], [`echo $fptools_cv_leading_underscore | sed 'y/yesno/YESNO/'`])
if test x"$fptools_cv_leading_underscore" = xyes; then
   AC_DEFINE([LEADING_UNDERSCORE], [1], [Define to 1 if C symbols have a leading underscore added by the compiler.])
fi])# FP_LEADING_UNDERSCORE
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# FP_COMPARE_VERSIONS(VERSION1, TEST, VERSION2, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
# ----------------------------------------------------------------------------------
# Compare dotted version numbers VERSION1 and VERSION2 lexicographically according
# to TEST (one of -eq, -ne, -lt, -le, -gt, or -ge).
AC_DEFUN([FP_COMPARE_VERSIONS],
[fp_version1=$1; fp_version2=$3
fp_save_IFS=$IFS; IFS='.'
while test x"$fp_version1" != x || test x"$fp_version2" != x
do

  set dummy $fp_version1; shift
  fp_num1=""
  test $[@%:@] = 0 || { fp_num1="[$]1"; shift; }
  test x"$fp_num1" = x && fp_num1="0"
  fp_version1="[$]*"

  set dummy $fp_version2; shift
  fp_num2=""
  test $[@%:@] = 0 || { fp_num2="[$]1"; shift; }
  test x"$fp_num2" = x && fp_num2="0"
  fp_version2="[$]*"

  test "$fp_num1" = "$fp_num2" || break;
done
IFS=$fp_save_IFS
AS_IF([test "$fp_num1" $2 "$fp_num2"], [$4], [$5])[]dnl
])# FP_COMPARE_VERSIONS
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dnl
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dnl Check for GreenCard and version.
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dnl
AC_DEFUN(FPTOOLS_GREENCARD,
[
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AC_PATH_PROG(GreenCardCmd,greencard)
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AC_CACHE_CHECK([for version of greencard], fptools_cv_greencard_version,
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changequote(, )dnl
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[if test x"$GreenCardCmd" != x; then
   fptools_cv_greencard_version="`$GreenCardCmd --version |
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			  grep 'version' | sed -e 's/greencard. version \([^ ]*\).*/\1/g'`"
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else
   fptools_cv_greencard_version=""
fi
changequote([, ])dnl
])
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FP_COMPARE_VERSIONS([$fptools_cv_greencard_version],[-lt],[$1],
  [AC_MSG_ERROR([greencard version $1 or later is required (found '$fptools_cv_greencard_version')])])[]dnl
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GreenCardVersion=$fptools_cv_greencard_version
AC_SUBST(GreenCardVersion)
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])

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dnl
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dnl Check for Happy and version.  If we're building GHC, then we need
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dnl at least Happy version 1.14.  If there's no installed Happy, we look
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dnl for a happy source tree and point the build system at that instead.
dnl
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AC_DEFUN(FPTOOLS_HAPPY,
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[
if test -d $srcdir/happy; then
   SrcTreeHappyCmd=$hardtop/happy/src/happy-inplace
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else
   SrcTreeHappyCmd=""
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fi
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if test x"$UseSrcTreeHappy" = xYES; then
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  if test x"$SrcTreeHappyCmd" != x; then
     HappyCmd=$SrcTreeHappyCmd
  else
     AC_MSG_ERROR([--enable-src-tree-happy given, but happy not found in source tree])
  fi
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else
  AC_PATH_PROG(HappyCmd,happy,$SrcTreeHappyCmd)
fi
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AC_CACHE_CHECK([for version of happy], fptools_cv_happy_version,
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changequote(, )dnl
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[if test x"$HappyCmd" = x"$SrcTreeHappyCmd" -a -e $srcdir/happy/mk/version.mk; then
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   fptools_cv_happy_version=`grep '^ProjectVersion[ 	]*=' $srcdir/happy/mk/version.mk | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`;
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elif test x"$HappyCmd" != x; then
   fptools_cv_happy_version="`$HappyCmd -v |
			  grep 'Happy Version' | sed -e 's/Happy Version \([^ ]*\).*/\1/g'`" ;
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else
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   fptools_cv_happy_version="";
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fi;
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changequote([, ])dnl
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])
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if test -d $srcdir/ghc -a ! -f $srcdir/ghc/compiler/parser/Parser.hs; then
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  FP_COMPARE_VERSIONS([$fptools_cv_happy_version],[-lt],[1.14],
  [AC_MSG_ERROR([Happy version 1.14 or later is required to compile GHC.])])[]dnl
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fi
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HappyVersion=$fptools_cv_happy_version;
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AC_SUBST(HappyVersion)
])

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dnl
dnl Check for Haddock and version.  If there's no installed Haddock, we look
dnl for a haddock source tree and point the build system at that instead.
dnl
AC_DEFUN(FPTOOLS_HADDOCK,
[
if test -d $srcdir/haddock; then
   SrcTreeHaddockCmd=$hardtop/haddock/src/haddock-inplace
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else
   SrcTreeHaddockCmd=""
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fi
if test x"$UseSrcTreeHaddock" = xYES; then
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  if test x"$SrcTreeHaddockCmd" != x; then
     HaddockCmd=$SrcTreeHaddockCmd
  else
     AC_MSG_ERROR([--enable-src-tree-haddock given, but haddock not found in source tree])
  fi
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else
  AC_PATH_PROG(HaddockCmd,haddock,$SrcTreeHaddockCmd)
fi
dnl Darn, I forgot to make Haddock print out its version number when
dnl invoked with -v.  We could try generating some HTML and grepping
dnl through that to find the version number, but I think we'll make
dnl do without it for now.
])

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dnl
dnl Check for Alex and version.  If we're building GHC, then we need
dnl at least Alex version 2.0.  If there's no installed Alex, we look
dnl for a alex source tree and point the build system at that instead.
dnl
AC_DEFUN(FPTOOLS_ALEX,
[
if test -d $srcdir/alex; then
   SrcTreeAlexCmd=$hardtop/alex/src/alex-inplace
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else
   SrcTreeAlexCmd=""
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fi
if test x"$UseSrcTreeAlex" = xYES; then
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  if test x"$SrcTreeAlexCmd" != x; then
     AlexCmd=$SrcTreeAlexCmd
  else
     AC_MSG_ERROR([--enable-src-tree-alex given, but alex not found in source tree])
  fi
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else
  AC_PATH_PROG(AlexCmd,alex,$SrcTreeAlexCmd)
fi
AC_CACHE_CHECK([for version of alex], fptools_cv_alex_version,
changequote(, )dnl
[if test x"$AlexCmd" = x"$SrcTreeAlexCmd"; then
   fptools_cv_alex_version=`grep '^ProjectVersion[ 	]*=' $srcdir/alex/mk/version.mk | sed 's/.*\([0-9][0-9]*\.[0-9][0-9]*\).*/\1/g'`;
elif test x"$AlexCmd" != x; then
   fptools_cv_alex_version="`$AlexCmd -v |
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			  grep 'Alex [Vv]ersion' | sed -e 's/Alex [Vv]ersion \([0-9\.]*\).*/\1/g'`" ;
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else
   fptools_cv_alex_version="";
fi;
changequote([, ])dnl
])
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if test -d $srcdir/ghc -a ! -f $srcdir/ghc/compiler/parser/Lexer.hs; then
  FP_COMPARE_VERSIONS([$fptools_cv_alex_version],[-lt],[2.0],
  [AC_MSG_ERROR([Alex version 2.0 or later is required to compile GHC.])])[]dnl
fi
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AlexVersion=$fptools_cv_alex_version;
AC_SUBST(AlexVersion)
])

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dnl
dnl Check whether ld supports -x
dnl
AC_DEFUN(FPTOOLS_LD_X,
[AC_CACHE_CHECK([whether ld understands -x], fptools_cv_ld_x,
[
echo 'foo() {}' > conftest.c
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${CC-cc} -c conftest.c
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if ${LdCmd} -r -x -o foo.o conftest.o; then
   fptools_cv_ld_x=yes
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else
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   fptools_cv_ld_x=no
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fi
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rm -rf conftest.c conftest.o foo.o
])
if test "$fptools_cv_ld_x" = yes; then
	LdXFlag=-x
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else
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	LdXFlag=
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fi
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AC_SUBST(LdXFlag)
])
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# FP_PROG_AR
# ----------
# Sets fp_prog_ar_raw to the full path of ar and fp_prog_ar to a non-Cygwin
# version of it. Exits if no ar can be found
AC_DEFUN([FP_PROG_AR],
[AC_PATH_PROG([fp_prog_ar_raw], [ar])
if test -z "$fp_prog_ar_raw"; then
  AC_MSG_ERROR([cannot find ar in your PATH, no idea how to make a library])
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fi
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fp_prog_ar=$fp_prog_ar_raw
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case $HostPlatform in
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  *mingw32) if test x${OSTYPE} != xmsys; then
 	      fp_prog_ar="`cygpath -w ${fp_prog_ar_raw} | sed -e 's@\\\\@/@g'`"
              AC_MSG_NOTICE([normalized ar command to $fp_prog_ar])
            fi
            ;;
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esac
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])# FP_PROG_AR


# FP_PROG_AR_IS_GNU
# -----------------
# Sets fp_prog_ar_is_gnu to yes or no, depending on whether it is GNU ar or not.
AC_DEFUN([FP_PROG_AR_IS_GNU],
[AC_REQUIRE([FP_PROG_AR])
AC_CACHE_CHECK([whether $fp_prog_ar_raw is GNU ar], [fp_cv_prog_ar_is_gnu],
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[if $fp_prog_ar_raw --version 2> /dev/null | grep "GNU" > /dev/null 2>&1; then
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  fp_cv_prog_ar_is_gnu=yes
else
  fp_cv_prog_ar_is_gnu=no
fi])
fp_prog_ar_is_gnu=$fp_cv_prog_ar_is_gnu
])# FP_PROG_AR_IS_GNU


# FP_PROG_AR_ARGS
# ---------------
# Sets fp_prog_ar_args to the arguments for ar and the output variable ArCmd
# to a non-Cygwin invocation of ar including these arguments.
AC_DEFUN([FP_PROG_AR_ARGS],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_CACHE_CHECK([for ar arguments], [fp_cv_prog_ar_args],
[
# GNU ar needs special treatment: it appears to have problems with
# object files with the same name if you use the 's' modifier, but
# simple 'ar q' works fine, and doesn't need a separate ranlib.
if test $fp_prog_ar_is_gnu = yes; then
  fp_cv_prog_ar_args="q"
else
  touch conftest.dummy
  for fp_var in clqsZ clqs cqs clq cq ; do
     rm -f conftest.a
     if $fp_prog_ar_raw $fp_var conftest.a conftest.dummy > /dev/null 2> /dev/null; then
        fp_cv_prog_ar_args=$fp_var
        break
     fi
  done
  rm -f conftest*
  if test -z "$fp_cv_prog_ar_args"; then
    AC_MSG_ERROR([cannot figure out how to use your $fp_prog_ar_raw])
  fi
fi])
fp_prog_ar_args=$fp_cv_prog_ar_args
AC_SUBST([ArCmd], ["$fp_prog_ar $fp_prog_ar_args"])

])# FP_PROG_AR_ARGS


# FP_PROG_AR_NEEDS_RANLIB
# -----------------------
# Sets the output variable RANLIB to "ranlib" if it is needed and found,
# to ":" otherwise.
AC_DEFUN([FP_PROG_AR_NEEDS_RANLIB],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_REQUIRE([FP_PROG_AR_ARGS])
AC_CACHE_CHECK([whether ranlib is needed], [fp_cv_prog_ar_needs_ranlib],
[if test $fp_prog_ar_is_gnu = yes; then
  fp_cv_prog_ar_needs_ranlib=no
elif echo $fp_prog_ar_args | grep "s" > /dev/null 2> /dev/null; then
  fp_cv_prog_ar_needs_ranlib=no
else
  fp_cv_prog_ar_needs_ranlib=yes
fi])
if test $fp_cv_prog_ar_needs_ranlib = yes; then
   AC_PROG_RANLIB
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else
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  RANLIB=":"
  AC_SUBST([RANLIB])
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fi
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])# FP_PROG_AR_NEEDS_RANLIB


# FP_PROG_AR_SUPPORTS_INPUT
# -------------------------
# Sets the output variable ArSupportsInput to "-input" or "", depending on
# whether ar supports -input flag is supported or not.
AC_DEFUN([FP_PROG_AR_SUPPORTS_INPUT],
[AC_REQUIRE([FP_PROG_AR_IS_GNU])
AC_REQUIRE([FP_PROG_AR_ARGS])
AC_CACHE_CHECK([whether $fp_prog_ar_raw supports -input], [fp_cv_prog_ar_supports_input],
[fp_cv_prog_ar_supports_input=no
if test $fp_prog_ar_is_gnu = no; then
  rm -f conftest*
  touch conftest.lst
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  if FP_EVAL_STDERR([$fp_prog_ar_raw $fp_prog_ar_args conftest.a -input conftest.lst]) >/dev/null; then
    test -s conftest.err || fp_cv_prog_ar_supports_input=yes
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  fi
  rm -f conftest*
fi])
if test $fp_cv_prog_ar_supports_input = yes; then
    ArSupportsInput="-input"
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else
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    ArSupportsInput=""
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fi
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AC_SUBST([ArSupportsInput])
])# FP_PROG_AR_SUPPORTS_INPUT

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dnl
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dnl AC_SHEBANG_PERL - can we she-bang perl?
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dnl
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AC_DEFUN(FPTOOLS_SHEBANG_PERL,
[AC_CACHE_CHECK([if your perl works in shell scripts], fptools_cv_shebang_perl,
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[echo "#!$PerlCmd"'
exit $1;
' > conftest
chmod u+x conftest
(SHELL=/bin/sh; export SHELL; ./conftest 69 > /dev/null)
if test $? -ne 69; then
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   fptools_cv_shebang_perl=yes
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else
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   fptools_cv_shebang_perl=no
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fi
rm -f conftest
])])

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dnl
dnl Extra testing of the result AC_PROG_CC, testing the gcc version no.
dnl *Must* be called after AC_PROG_CC
dnl
AC_DEFUN(FPTOOLS_HAVE_GCC,
[AC_CACHE_CHECK([whether you have an ok gcc], fptools_cv_have_gcc,
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[if test -z "$GCC"; then
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    echo ''
    echo "You would be better off with gcc"
    echo "Perhaps it is already installed, but not in your PATH?"
    fptools_cv_have_gcc='no'
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else
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changequote(, )dnl
    gcc_version_str="`$CC -v 2>&1 | grep 'version ' | sed -e 's/.*version [^0-9]*\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1\.\2/g' `"
changequote([, ])dnl
    fptools_cv_have_gcc='yes'
    FP_COMPARE_VERSIONS([$gcc_version_str], [-lt], [2.0],
        [fptools_cv_have_gcc='no'
        echo ""
	echo "your gcc version appears to be ..."
        $CC --version
        echo "gcc prior to 2.0 and have never worked with ghc."
        echo "we recommend 2.95.3, although versions back to 2.7.2 should be ok."
        AC_MSG_ERROR([gcc 1.X has never been supported])])
fi
])
HaveGcc=`echo $fptools_cv_have_gcc | sed 'y/yesno/YESNO/'`
AC_SUBST(HaveGcc)
GccVersion=`gcc --version | grep mingw | cut -f 3 -d ' '`
AC_SUBST(GccVersion)
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])
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dnl
dnl Some OSs (Mandrake Linux, in particular) configure GCC with
dnl -momit-leaf-frame-pointer on by default.  If this is the case, we
dnl need to turn it off for mangling to work.  The test is currently a bit
dnl crude, using only the version number of gcc.
dnl
AC_DEFUN([FPTOOLS_GCC_NEEDS_NO_OMIT_LFPTR],
[AC_CACHE_CHECK([whether gcc needs -mno-omit-leaf-frame-pointer], [fptools_cv_gcc_needs_no_omit_lfptr],
[FP_COMPARE_VERSIONS([$gcc_version_str], [-ge], [3.2],
  [fptools_cv_gcc_needs_no_omit_lfptr=yes],
  [fptools_cv_gcc_needs_no_omit_lfptr=no])])
if test "$fptools_cv_gcc_needs_no_omit_lfptr" = "yes"; then
   AC_DEFINE([HAVE_GCC_MNO_OMIT_LFPTR], [1], [Define to 1 if gcc supports -mno-omit-leaf-frame-pointer.])
fi])# FPTOOLS_GCC_NEEDS_NO_OMIT_LFPTR


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dnl Small feature test for perl version. Assumes PerlCmd
dnl contains path to perl binary
dnl
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AC_DEFUN(FPTOOLS_CHECK_PERL_VERSION,
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[$PerlCmd -v >conftest.out 2>&1
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if grep "version 5" conftest.out >/dev/null 2>&1; then
   :
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else
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   if grep "v5.6" conftest.out >/dev/null 2>&1; then
      :
   else
      if grep "v5.8" conftest.out >/dev/null 2>&1; then
         :
      else
         if grep "version 6" conftest.out >/dev/null 2>&1; then
            :
         else
            echo "Your version of perl probably won't work."
         fi  
      fi
   fi
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fi
rm -fr conftest*
])
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# FP_CHECK_PROG(VARIABLE, PROG-TO-CHECK-FOR,
#               [VALUE-IF-NOT-FOUND], [PATH], [REJECT])
# -----------------------------------------------------
# HACK: A small wrapper around AC_CHECK_PROG, setting VARIABLE to the full path
# of PROG-TO-CHECK-FOR when found.
AC_DEFUN([FP_CHECK_PROG],
[AC_CHECK_PROG([$1], [$2], [$as_dir/$ac_word$ac_exec_ext], [$3], [$4], [$5])][]dnl
)# FP_CHECK_PROC


# FP_PROG_FIND
# ------------
# Find a non-WinDoze version of the "find" utility.
AC_DEFUN([FP_PROG_FIND],
[AC_PATH_PROG([fp_prog_find], [find])
echo foo > conftest.txt
$fp_prog_find conftest.txt -print > conftest.out 2>&1
if grep '^conftest.txt$' conftest.out > /dev/null 2>&1 ; then
  # OK, looks like a real "find".
  FindCmd="$fp_prog_find"
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else
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  # Found a poor WinDoze version of "find", ignore it.
  AC_MSG_WARN([$fp_prog_find looks like a non-*nix find, ignoring it])
  FP_CHECK_PROG([FindCmd], [find], [], [], [$fp_prog_find])
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fi
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rm -f conftest.txt conftest.out
AC_SUBST([FindCmd])[]dnl
])# FP_PROG_FIND

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dnl
dnl FPTOOLS_NOCACHE_CHECK prints a message, then sets the
dnl values of the second argument to the result of running
dnl the commands given by the third. It does not cache its
dnl result, so it is suitable for checks which should be
dnl run every time.
dnl
AC_DEFUN(FPTOOLS_NOCACHE_CHECK,
[AC_MSG_CHECKING([$1])
 $3
 AC_MSG_RESULT([$][$2])
])

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dnl
dnl FPTOOLS_GHC_VERSION(version)
dnl FPTOOLS_GHC_VERSION(major, minor [, patchlevel])
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dnl FPTOOLS_GHC_VERSION(version, major, minor, patchlevel)
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dnl
dnl Test for version of installed ghc.  Uses $GHC.
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dnl [original version pinched from c2hs]
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dnl
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AC_DEFUN(FPTOOLS_GHC_VERSION,
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[FPTOOLS_NOCACHE_CHECK([version of ghc], [fptools_version_of_ghc],
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["${WithGhc-ghc}" --version > conftestghc 2>&1
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  cat conftestghc >&AS_MESSAGE_LOG_FD
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#Useless Use Of cat award...
  fptools_version_of_ghc=`cat conftestghc | sed -n -e 's/, patchlevel *\([[0-9]]\)/.\1/;s/.* version \([[0-9]][[0-9.]]*\).*/\1/p'`
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  rm -fr conftest*
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  if test "[$]fptools_version_of_ghc" = ""
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  then
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    fptools_version_of_ghc='unknown'
  fi
fptools_version_of_ghc[_major]=`echo [$]fptools_version_of_ghc | sed -e 's/^\([[0-9]]\).*/\1/'`
fptools_version_of_ghc[_minor]=`echo [$]fptools_version_of_ghc | sed -e 's/^[[0-9]]\.\([[0-9]]*\).*/\1/'`
fptools_version_of_ghc[_pl]=`echo [$]fptools_version_of_ghc | sed -n -e 's/^[[0-9]]\.[[0-9]]*\.\([[0-9]]*\)/\1/p'`
#
if test "[$]fptools_version_of_ghc[_pl]" = ""
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then
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  fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor]"
  fptools_version_of_ghc[_pl]="0"
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else
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  fptools_version_of_ghc[_all]="[$]fptools_version_of_ghc[_major].[$]fptools_version_of_ghc[_minor].[$]fptools_version_of_ghc[_pl]"
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fi
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#
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ifelse($#, [1], [dnl
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[$1]="[$]fptools_version_of_ghc[_all]"
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], $#, [2], [dnl
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[$1]="[$]fptools_version_of_ghc[_major]"
[$2]="[$]fptools_version_of_ghc[_minor]"
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], $#, [3], [dnl
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[$1]="[$]fptools_version_of_ghc[_major]"
[$2]="[$]fptools_version_of_ghc[_minor]"
[$3]="[$]fptools_version_of_ghc[_pl]"
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], $#, [4], [dnl
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[$1]="[$]fptools_version_of_ghc[_all]"
[$2]="[$]fptools_version_of_ghc[_major]"
[$3]="[$]fptools_version_of_ghc[_minor]"
[$4]="[$]fptools_version_of_ghc[_pl]"
])
])
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])dnl
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dnl ** Map an arithmetic C type to a Haskell type.
dnl    Based on autconf's AC_CHECK_SIZEOF.

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dnl FPTOOLS_CHECK_HTYPE(TYPE [, DEFAULT_VALUE, [, VALUE-FOR-CROSS-COMPILATION])
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AC_DEFUN(FPTOOLS_CHECK_HTYPE,
[changequote(<<, >>)dnl
dnl The name to #define.
define(<<AC_TYPE_NAME>>, translit(htype_$1, [a-z *], [A-Z_P]))dnl
dnl The cache variable name.
define(<<AC_CV_NAME>>, translit(fptools_cv_htype_$1, [ *], [_p]))dnl
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define(<<AC_CV_NAME_supported>>, translit(fptools_cv_htype_sup_$1, [ *], [_p]))dnl
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changequote([, ])dnl
AC_MSG_CHECKING(Haskell type for $1)
AC_CACHE_VAL(AC_CV_NAME,
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[AC_CV_NAME_supported=yes
fp_check_htype_save_cppflags="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $X_CFLAGS"
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AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <stdio.h>
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#include <stddef.h>
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#if HAVE_SYS_TYPES_H
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# include <sys/types.h>
#endif

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#if HAVE_UNISTD_H
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# include <unistd.h>
#endif

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#if HAVE_SYS_STAT_H
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# include <sys/stat.h>
#endif

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#if HAVE_FCNTL_H
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# include <fcntl.h>
#endif

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#if HAVE_SIGNAL_H
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# include <signal.h>
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#endif
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#if HAVE_TIME_H
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# include <time.h>
#endif

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#if HAVE_TERMIOS_H
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# include <termios.h>
#endif

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#if HAVE_STRING_H
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# include <string.h>
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#endif
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#if HAVE_CTYPE_H
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# include <ctype.h>
#endif

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#if defined(HAVE_GL_GL_H)
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# include <GL/gl.h>
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#elif defined(HAVE_OPENGL_GL_H)
# include <OpenGL/gl.h>
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#endif
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#if defined(HAVE_AL_ALC_H)
# include <AL/alc.h>
#elif defined(HAVE_OPENAL_ALC_H)
# include <OpenAL/alc.h>
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#endif

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#if HAVE_SYS_RESOURCE_H
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# include <sys/resource.h>
#endif

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typedef $1 testing;

main() {
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  FILE *f=fopen("conftestval", "w");
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  if (!f) exit(1);
  if (((testing)((int)((testing)1.4))) == ((testing)1.4)) {
    fprintf(f, "%s%d\n",
           ((testing)(-1) < (testing)0) ? "Int" : "Word",
           sizeof(testing)*8);
  } else {
    fprintf(f,"%s\n",
           (sizeof(testing) >  sizeof(double)) ? "LDouble" :
           (sizeof(testing) == sizeof(double)) ? "Double"  : "Float");
  }
  fclose(f);
  exit(0);
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}]])],[AC_CV_NAME=`cat conftestval`],
[ifelse([$2], , [AC_CV_NAME=NotReallyAType; AC_CV_NAME_supported=no], [AC_CV_NAME=$2])],
[ifelse([$3], , [AC_CV_NAME=NotReallyATypeCross; AC_CV_NAME_supported=no], [AC_CV_NAME=$3])])]) dnl
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CPPFLAGS="$fp_check_htype_save_cppflags"
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if test "$AC_CV_NAME_supported" = yes; then
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  AC_MSG_RESULT($AC_CV_NAME)
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  AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [Define to Haskell type for $1])
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else
  AC_MSG_RESULT([not supported])
fi
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undefine([AC_TYPE_NAME])dnl
undefine([AC_CV_NAME])dnl
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undefine([AC_CV_NAME_supported])dnl
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])

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# FP_CHECK_FUNC(FUNCTION, PROLOGUE, BODY, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# ---------------------------------------------------------------------------------
# A variant of AC_CHECK_FUNCS, limited to a single FUNCTION, but with the
# additional flexibility of specifying the PROLOGUE and BODY.
AC_DEFUN([FP_CHECK_FUNC],
[AS_VAR_PUSHDEF([fp_func], [fp_cv_func_$1])dnl
AC_CACHE_CHECK([for $1], fp_func,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([$2], [$3])],
                [AS_VAR_SET(fp_func, yes)],
                [AS_VAR_SET(fp_func, no)])])
AS_IF([test AS_VAR_GET(fp_func) = yes],
      [AC_DEFINE(AS_TR_CPP(HAVE_$1), [1],
                [Define to 1 if you have the `]$1[' function.]) $4],
      [$5])dnl
AS_VAR_POPDEF([fp_func])dnl
])# FP_CHECK_FUNC


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# FP_GEN_DOCBOOK_XML
# ------------------
# Generates a DocBook XML V4.2 document in conftest.xml.
AC_DEFUN([FP_GEN_DOCBOOK_XML],
[rm -f conftest.xml
cat > conftest.xml << EOF
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<book id="test">
  <title>A DocBook Test Document</title>
  <chapter id="id-one">
    <title>A Chapter Title</title>
    <para>This is a paragraph, referencing <xref linkend="id-two"/>.</para>
  </chapter>
  <chapter id="id-two">
    <title>Another Chapter Title</title>
    <para>This is another paragraph, referencing <xref linkend="id-one"/>.</para>
  </chapter>
</book>
EOF
]) # FP_GEN_DOCBOOK_XML


# FP_PROG_XSLTPROC
# ----------------
# Sets the output variable XsltprocCmd to the full path of the XSLT processor
# xsltproc. XsltprocCmd is empty if xsltproc could not be found.
AC_DEFUN([FP_PROG_XSLTPROC],
[AC_PATH_PROG([XsltprocCmd], [xsltproc])
if test -z "$XsltprocCmd"; then
  AC_MSG_WARN([cannot find xsltproc in your PATH, you will not be able to build the documentation])
fi
])# FP_PROG_XSLTPROC


# FP_DIR_DOCBOOK_XSL(XSL-DIRS)
# ----------------------------
# Check which of the directories XSL-DIRS contains DocBook XSL stylesheets. The
# output variable DIR_DOCBOOK_XSL will contain the first usable directory or
# will be empty if none could be found.
AC_DEFUN([FP_DIR_DOCBOOK_XSL],
[AC_REQUIRE([FP_PROG_XSLTPROC])dnl
if test -n "$XsltprocCmd"; then
  AC_CACHE_CHECK([for DocBook XSL stylesheet directory], fp_cv_dir_docbook_xsl,
  [FP_GEN_DOCBOOK_XML
  fp_cv_dir_docbook_xsl=no
  for fp_var in $1; do
     if $XsltprocCmd ${fp_var}/html/docbook.xsl conftest.xml > /dev/null 2>&1; then
        fp_cv_dir_docbook_xsl=$fp_var
        break
     fi
  done
  rm -rf conftest*])
fi
if test x"$fp_cv_dir_docbook_xsl" = xno; then
  AC_MSG_WARN([cannot find DocBook XSL stylesheets, you will not be able to build the documentation])
  DIR_DOCBOOK_XSL=
else
  DIR_DOCBOOK_XSL=$fp_cv_dir_docbook_xsl
fi
AC_SUBST([DIR_DOCBOOK_XSL])
])# FP_DIR_DOCBOOK_XSL


# FP_PROG_XMLLINT
# ----------------
# Sets the output variable XmllintCmd to the full path of the XSLT processor
# xmllint. XmllintCmd is empty if xmllint could not be found.
AC_DEFUN([FP_PROG_XMLLINT],
[AC_PATH_PROG([XmllintCmd], [xmllint])
if test -z "$XmllintCmd"; then
  AC_MSG_WARN([cannot find xmllint in your PATH, you will not be able to validate your documentation])
fi
])# FP_PROG_XMLLINT


# FP_CHECK_DOCBOOK_DTD
# --------------------
AC_DEFUN([FP_CHECK_DOCBOOK_DTD],
[AC_REQUIRE([FP_PROG_XMLLINT])dnl
if test -n "$XmllintCmd"; then
  AC_MSG_CHECKING([for DocBook DTD])
  FP_GEN_DOCBOOK_XML
  if $XmllintCmd --valid --noout conftest.xml > /dev/null 2>&1; then
    AC_MSG_RESULT([ok])
  else
    AC_MSG_RESULT([failed])
    AC_MSG_WARN([cannot find a DTD for DocBook XML V4.2, you will not be able to validate your documentation])
    AC_MSG_WARN([check your XML_CATALOG_FILES environment variable and/or /etc/xml/catalog])
  fi
  rm -rf conftest*
fi
])# FP_CHECK_DOCBOOK_DTD


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# FP_GEN_FO
# ------------------
# Generates a formatting objects document in conftest.fo.
AC_DEFUN([FP_GEN_FO],
[rm -f conftest.fo
cat > conftest.fo << EOF
<?xml version="1.0"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
  <fo:layout-master-set>
    <fo:simple-page-master master-name="blank">
      <fo:region-body/>
    </fo:simple-page-master>
  </fo:layout-master-set>
  <fo:page-sequence master-reference="blank">
    <fo:flow flow-name="xsl-region-body">
      <fo:block>
        Test!
      </fo:block>
    </fo:flow>
  </fo:page-sequence>
</fo:root>
EOF
]) # FP_GEN_FO


# FP_PROG_FOP
# -----------
# Set the output variable 'FopCmd' to the first working 'fop' in the current
# 'PATH'. Note that /usr/bin/fop is broken in SuSE 9.1 (unpatched), so try
# /usr/share/fop/fop.sh in that case (or no 'fop'), too.
AC_DEFUN([FP_PROG_FOP],
[AC_PATH_PROGS([FopCmd1], [fop])
if test -n "$FopCmd1"; then
  AC_CACHE_CHECK([for $FopCmd1 usability], [fp_cv_fop_usability],
    [FP_GEN_FO
    if "$FopCmd1" -fo conftest.fo -ps conftest.ps > /dev/null 2>&1; then
      fp_cv_fop_usability=yes
    else
      fp_cv_fop_usability=no
    fi
    rm -rf conftest*])
  if test x"$fp_cv_fop_usability" = xyes; then
     FopCmd=$FopCmd1
  fi
fi
if test -z "$FopCmd"; then
  AC_PATH_PROGS([FopCmd2], [fop.sh], , [/usr/share/fop])
  FopCmd=$FopCmd2
fi
AC_SUBST([FopCmd])
])# FP_PROG_FOP


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# FP_PROG_FO_PROCESSOR
# --------------------
# Try to find an FO processor. PassiveTeX output is sometimes a bit strange, so
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# try FOP first. Sets the output variables FopCmd, XmltexCmd, DvipsCmd, and
# PdfxmltexCmd.
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AC_DEFUN([FP_PROG_FO_PROCESSOR],
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[AC_REQUIRE([FP_PROG_FOP])
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AC_PATH_PROG([XmltexCmd], [xmltex])
AC_PATH_PROG([DvipsCmd], [dvips])
if test -z "$FopCmd"; then
  if test -z "$XmltexCmd"; then
    AC_MSG_WARN([cannot find an FO => DVI converter, you will not be able to build DVI or PostScript documentation])
  else
    if test -z "$DvipsCmd"; then
      AC_MSG_WARN([cannot find a DVI  => PS converter, you will not be able to build PostScript documentation])
    fi
  fi
  AC_PATH_PROG([PdfxmltexCmd], [pdfxmltex])
  if test -z "$PdfxmltexCmd"; then
    AC_MSG_WARN([cannot find an FO => PDF converter, you will not be able to build PDF documentation])
  fi
elif test -z "$XmltexCmd"; then
  AC_MSG_WARN([cannot find an FO => DVI converter, you will not be able to build DVI documentation])
fi
])# FP_PROG_FO_PROCESSOR


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# FP_PROG_GHC_PKG
# ----------------
# Try to find a ghc-pkg matching the ghc mentioned in the environment variable
# WithGhc. If the latter is unset or no matching ghc-pkg can be found, try to
# find a plain ghc-pkg. Sets the output variable GhcPkgCmd.
AC_DEFUN([FP_PROG_GHC_PKG],
[AC_CACHE_CHECK([for ghc-pkg matching $WithGhc], fp_cv_matching_ghc_pkg,
[fp_ghc_pkg_guess=`echo $WithGhc | sed 's,ghc\(@<:@^/\\@:>@*\)$,ghc-pkg\1,'`
if "$fp_ghc_pkg_guess" -l > /dev/null 2>&1; then
  fp_cv_matching_ghc_pkg=$fp_ghc_pkg_guess
else
  fp_cv_matching_ghc_pkg=no
fi])
if test x"$fp_cv_matching_ghc_pkg" = xno; then
  AC_PATH_PROG([GhcPkgCmd], [ghc-pkg])
else
  GhcPkgCmd=$fp_cv_matching_ghc_pkg
fi])# FP_PROG_GHC_PKG

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# FP_CHECK_WIN32
# --------------
# If Windows is the target platform (e.g. MinGW/MSYS or Cygwin with
# -mno-cygwin), the variable "is_win32" is set to "yes", otherwise (e.g. *nix
# systems or plain Cygwin) it is set to "no".
AC_DEFUN([FP_CHECK_WIN32],
[AC_CACHE_CHECK([for Windows environment], [fp_cv_is_win32],
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !_WIN32
   syntax error;
#endif
])], [fp_cv_is_win32=yes], [fp_cv_is_win32=no])])
is_win32="$fp_cv_is_win32"[]dnl
])# FP_CHECK_WIN32


# FP_PATH_X
# ---------
# Same as AC_PATH_X, but works even for broken Cygwins which try to include the
# non-existant <gl/mesa_wgl.h> header when -mno-cygwin is used.
AC_DEFUN([FP_PATH_X],
[AC_REQUIRE([FP_CHECK_WIN32])
if test x"$is_win32" = xyes; then
  no_x=yes
else
  AC_PATH_X
fi
])# FP_PATH_X


# FP_PATH_XTRA
# ------------
# Same as AC_PATH_XTRA, but works even for broken Cygwins which try to include
# the non-existant <gl/mesa_wgl.h> header when -mno-cygwin is used.
AC_DEFUN([FP_PATH_XTRA],
[AC_REQUIRE([FP_CHECK_WIN32])
if test x"$is_win32" = xyes; then
  no_x=yes
else
  AC_PATH_XTRA
fi
])# FP_PATH_XTRA


# FP_CHECK_GL_HELPER(LIBNAME, LIBS, INCLUDES, FUNCTION-BODY)
# ----------------------------------------------------------
# Try each library in LIBS to successfully link INCLUDES plus FUNCTION-BODY,
# setting LIBNAME_CFLAGS and LIBNAME_LIBS to the corresponding values. Sets
# no_LIBNAME to "yes" if no suitable library was found. (LIBNAME_CFLAGS0
# contains the value of LIBNAME_CFLAGS without CPPFLAGS, and LIBNAME_LIBS0
# contains the value of LIBNAME_LIBS without LDFLAGS, but these are only
# used internally.)
AC_DEFUN([FP_CHECK_GL_HELPER],
[AC_CACHE_CHECK([for $1 library], [fp_cv_check_$1_lib],
  [fp_cv_check_$1_lib="no"
  fp_save_CPPFLAGS="$CPPFLAGS"
  CPPFLAGS="$CPPFLAGS ${$1_CFLAGS}"
  fp_save_LIBS="$LIBS"
  for fp_try_lib in $2; do
    # transform "-lfoo" to "foo.lib" when using cl
    if test x"$CC" = xcl; then
      fp_try_lib=`echo $fp_try_lib | sed -e 's/^-l//' -e 's/$/.lib/'`
    fi
    LIBS="$fp_try_lib ${$1_LIBS} $fp_save_LIBS"
    AC_LINK_IFELSE([AC_LANG_PROGRAM([$3], [$4])], [fp_cv_check_$1_lib="$fp_try_lib ${$1_LIBS}"; break])
  done
  LIBS="$fp_save_LIBS"
  CPPFLAGS="$fp_save_CPPFLAGS"])

  if test x"$fp_cv_check_$1_lib" = xno; then
    no_$1=yes
    $1_CFLAGS=
    $1_LIBS=
  else
    $1_CFLAGS0="${$1_CFLAGS}"
    $1_CFLAGS="$CPPFLAGS ${$1_CFLAGS0}"
    $1_LIBS0="$fp_cv_check_$1_lib"
    $1_LIBS="$LDFLAGS ${$1_LIBS0}"
  fi
])# FP_CHECK_GL_HELPER


# FP_CHECK_GL
# -----------
AC_DEFUN([FP_CHECK_GL],
[AC_REQUIRE([FP_PATH_X])
AC_REQUIRE([AC_CANONICAL_TARGET])

AC_ARG_ENABLE([hopengl],
  [AC_HELP_STRING([--enable-hopengl],
    [build a Haskell binding for OpenGL (GL/GLU). On Mac OS X, use
     --enable-hopengl=x11 to use X11 instead of the "native" libraries.
     (default=no)])],
  [enable_opengl=$enableval], [enable_opengl=no])

if test x"$enable_opengl" = xno; then
   no_GL=yes
else
  use_quartz_opengl=no
  case $target_os in
  darwin*)
    if test x"$enable_opengl" != xx11; then
      AC_DEFINE([USE_QUARTZ_OPENGL], [1],
                [Define to 1 if native OpenGL should be used on Mac OS X])
      use_quartz_opengl=yes
    fi
    ;;
  esac

  if test x"$use_quartz_opengl" != xyes; then
    AC_CHECK_LIB([m], [atan], [GL_LIBS="-lm $GL_LIBS"])

    if test x"$no_x" != xyes; then
      test -n "$x_includes" && GL_CFLAGS="-I$x_includes $GL_CFLAGS"
      test -n "$x_libraries" && GL_LIBS="-L$x_libraries -lX11 $GL_LIBS"
    fi

    FP_CHECK_GL_HELPER([GL], [-lGL -lopengl32], [@%:@include <GL/gl.h>], [glEnd()])

    if test x"$no_GL" != xyes; then
      # Ugly: To get wglGetProcAddress on Windows, we have to link with
      # opengl32.dll, too, even when we are using Cygwin with X11.
      case "$GL_LIBS" in
        *-lopengl32*|*opengl32.lib*) ;;
        *) fp_save_LIBS="$LIBS"
           LIBS="$LIBS -lopengl32"
           AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <GL/gl.h>]], [[glEnd()]])],
             [GL_LIBS="$GL_LIBS -lopengl32"; GL_LIBS0="$GL_LIBS0 -lopengl32"])
           LIBS="$fp_save_LIBS"
           ;;
      esac
    fi
  fi
fi

AC_SUBST([GL_CFLAGS])
AC_SUBST([GL_LIBS])
])# FP_CHECK_GL


# FP_CHECK_GLU
# ------------
AC_DEFUN([FP_CHECK_GLU],
[AC_REQUIRE([FP_CHECK_GL])dnl
GLU_CFLAGS="$GL_CFLAGS0"
GLU_LIBS="$GL_LIBS0"

if test x"$enable_opengl" = xno; then
   no_GLU=yes
elif test x"$use_quartz_opengl" != xyes; then
  FP_CHECK_GL_HELPER([GLU], [-lglu32 -lGLU], [@%:@include <GL/glu.h>], [gluNewQuadric()])
fi

AC_SUBST([GLU_CFLAGS])
AC_SUBST([GLU_LIBS])
])# FP_CHECK_GLU


# FP_CHECK_GLUT
# -------------
AC_DEFUN([FP_CHECK_GLUT],
[AC_REQUIRE([FP_CHECK_GLU])
FP_PATH_XTRA

if test x"$enable_opengl" = xno; then
   no_GLUT=yes
elif test x"$use_quartz_opengl" != xyes; then
  GLUT_CFLAGS="$GLU_CFLAGS0"
  GLUT_LIBS="$GLU_LIBS0"

  if test x"$no_x" != xyes; then
    GLUT_LIBS="$X_PRE_LIBS -lXmu -lXi $X_EXTRA_LIBS $GLUT_LIBS"
  fi

  AC_CHECK_HEADERS([windows.h GL/glut.h])
  # Note 1: On Cygwin with X11, GL/GLU functions use the "normal" calling
  # convention, but GLUT functions use stdcall. To get this right, it is
  # necessary to include <windows.h> first.
  # Note 2: MinGW/MSYS comes without a GLUT header, so we use Cygwin's one in
  # that case.
  FP_CHECK_GL_HELPER([GLUT], [-lglut32 -lglut], [
#if HAVE_WINDOWS_H
#include <windows.h>
#endif
#if HAVE_GL_GLUT_H
#include <GL/glut.h>
#else
#include "glut_local.h"
#endif
    ], [glutMainLoop()])
fi

AC_SUBST([GLUT_CFLAGS])
AC_SUBST([GLUT_LIBS])
])# FP_CHECK_GLUT


# FP_EMPTY_STRUCTS
# ---------------- 
# Define output variable SUPPORTS_EMPTY_STRUCTS if empty structs are accepted by
# CC.
dnl
AC_DEFUN(FP_EMPTY_STRUCTS,
[AC_CACHE_CHECK(empty struct support, fp_cv_empty_structs,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[typedef struct { /* empty */ } StgFoo;]],
[[int i;]])],
[fp_cv_empty_structs=yes],
[fp_cv_empty_structs=no])])
if test x"$fp_cv_empty_structs" = xyes; then
  AC_DEFINE([SUPPORTS_EMPTY_STRUCTS], [1], [Define to 1 if C compiler supports declaration of empty structure types.])
fi
])


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# LocalWords:  fi