New macros for configuring clients of mLib and Catacomb.

[cfd] / aclocal.glob

dnl -*-fundamental-*-					  *@--GLOB-HEADER--@*
dnl
dnl $Id: aclocal.glob,v 1.6 1999/11/11 17:49:33 mdw Exp $
dnl
dnl Common library of autoconf macros
dnl
dnl (c) 1997 Mark Wooding, except for macros and documentation where noted.
dnl

dnl----- Licensing notice ---------------------------------------------------
dnl
dnl This file is part of the Common Files Distribution (`common')
dnl 
dnl `Common' is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 of the License, or
dnl (at your option) any later version.
dnl 
dnl `Common' is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl 
dnl You should have received a copy of the GNU General Public License
dnl along with `common'; if not, write to the Free Software Foundation,
dnl Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

dnl----- Revision history ---------------------------------------------------
dnl
dnl $Log: aclocal.glob,v $
dnl Revision 1.6  1999/11/11 17:49:33  mdw
dnl New macros for configuring clients of mLib and Catacomb.
dnl
dnl Revision 1.5  1999/07/27 18:27:37  mdw
dnl Fix typo in header line for mdw_DECL_ENVIRON.
dnl
dnl Revision 1.4  1999/07/26 23:44:32  mdw
dnl Reorder and tidy documentation.
dnl
dnl Revision 1.3  1999/07/17 10:27:44  mdw
dnl More useful macros added.
dnl
dnl Revision 1.2  1999/05/13 22:57:23  mdw
dnl Change `-ise' to `-ize' throughout.
dnl
dnl Revision 1.1.1.1  1999/05/05 19:23:47  mdw
dnl New import.  The old CVS repository was lost in a disk disaster.
dnl

dnl----- Common files distribution --------------------------- *@--NOTICE--@*
dnl
dnl $Id: aclocal.glob,v 1.6 1999/11/11 17:49:33 mdw Exp $

dnl --- *@-AC_PROG_CC_STDC-@* ---
dnl
dnl Author:	Franc,ois Pinard
dnl
dnl Synopsis:	AC_PROG_CC_STDC
dnl
dnl Arguments:	---
dnl
dnl Use:	If the C compiler in not in ANSI C mode by default, try to
dnl		add an option to output variable `CC' to make it so.  This
dnl		macro tries various options that select ANSI C on some system
dnl		or another.  It considers the compiler to be in ANSI C mode
dnl		if it defines `__STDC__' to 1 and handles function prototypes
dnl		correctly.
dnl
dnl		If you use this macro, you should check after calling it
dnl		whether the C compiler has been set to accept ANSI C; if not,
dnl		the shell variable `ac_cv_prog_cc_stdc' is set to `no'.  If
dnl		you wrote your source code in ANSI C, you can make an
dnl		un-ANSIfied copy of it by using the program `ansi2knr', which
dnl		comes with Ghostscript.
dnl
dnl					(documentation by Franc,ois Pinard)

AC_DEFUN(AM_PROG_CC_STDC,
[AC_REQUIRE([AC_PROG_CC])
AC_BEFORE([$0], [AC_C_INLINE])
AC_BEFORE([$0], [AC_C_CONST])
AC_MSG_CHECKING(for ${CC-cc} option to accept ANSI C)
AC_CACHE_VAL(am_cv_prog_cc_stdc,
[am_cv_prog_cc_stdc=no
ac_save_CC="$CC"
# Don't try gcc -ansi; that turns off useful extensions and
# breaks some systems' header files.
# AIX                   -qlanglvl=ansi
# Ultrix and OSF/1      -std1
# HP-UX                 -Aa -D_HPUX_SOURCE
# SVR4                  -Xc -D__EXTENSIONS__
for ac_arg in "" -qlanglvl=ansi -std1 "-Aa -D_HPUX_SOURCE" "-Xc -D__EXTENSIONS__"
do
  CC="$ac_save_CC $ac_arg"
  AC_TRY_COMPILE(
[#if !defined(__STDC__) || __STDC__ != 1
choke me
#endif
/* DYNIX/ptx V4.1.3 can't compile sys/stat.h with -Xc -D__EXTENSIONS__. */
#ifdef _SEQUENT_
# include <sys/types.h>
# include <sys/stat.h>
#endif
], [
int test (int i, double x);
struct s1 {int (*f) (int a);};
struct s2 {int (*f) (double a);};],
[am_cv_prog_cc_stdc="$ac_arg"; break])
done
CC="$ac_save_CC"
])
if test -z "$am_cv_prog_cc_stdc"; then
  AC_MSG_RESULT([none needed])
else
  AC_MSG_RESULT($am_cv_prog_cc_stdc)
fi
case "x$am_cv_prog_cc_stdc" in
  x|xno) ;;
  *) CC="$CC $am_cv_prog_cc_stdc" ;;
esac
])

dnl----- AutoMake macros ------------------------------------- *@--IGNORE--@*

dnl --- *@-AM_CONDITIONAL-@* ---
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_CONDITIONAL(NAME, TEST)
dnl
dnl Arguments:	NAME = name of the conditional
dnl		TEST = a shell list to execute
dnl
dnl Use:	Allows conditional sections in Makefiles.

AC_DEFUN(AM_CONDITIONAL,
[AC_SUBST($1_TRUE)
AC_SUBST($1_FALSE)
if $2; then
  $1_TRUE=
  $1_FALSE='#'
else
  $1_TRUE='#'
  $1_FALSE=
fi])

dnl --- *@-AM_CYGWIN32-@* ---
dnl
dnl Author:	Cygnus (I guess)
dnl
dnl Synopsis:	AM_CYGWIN32
dnl
dnl Arguments:	---
dnl
dnl Use:	Check to see if we're running under Cygwin32, without using
dnl		AC_CANONICAL_*.  If so, set output variable EXEEXT to
dnl		".exe".  Otherwise set it to "".

dnl AM_CYGWIN32()
dnl You might think we can do this by checking for a cygwin32-specific
dnl cpp define.  We can't, because cross-compilers that target
dnl cygwin32 don't use the .exe suffix.  I don't know why.
AC_DEFUN(AM_CYGWIN32,
[AC_CACHE_CHECK(for Cygwin32 environment, am_cv_cygwin32,
[cat > conftest.$ac_ext << 'EOF'
int main () {
/* Nothing.  */
return 0; }
EOF
if AC_TRY_EVAL(ac_link) && test -s conftest.exe; then
   am_cv_cygwin32=yes
else
   am_cv_cygwin32=no
fi
rm -f conftest*])
EXEEXT=
test "$am_cv_cygwin32" = yes && EXEEXT=.exe
AC_SUBST(EXEEXT)])

dnl --- *@-AM_WITH_DMALLOC-@* ---
dnl
dnl Author:	Franc,ois Pinard
dnl
dnl Synopsis:	AM_WITH_DMALLOC
dnl
dnl Arguments:	---
dnl
dnl Use:	Links with `-dmalloc' if told to by the user.

## ----------------------------------- ##
## Check if --with-dmalloc was given.  ##
## From Franc,ois Pinard               ##
## ----------------------------------- ##

# serial 1

AC_DEFUN(AM_WITH_DMALLOC,
[AC_MSG_CHECKING(if malloc debugging is wanted)
AC_ARG_WITH(dmalloc,
[  --with-dmalloc          use dmalloc, as in
                          ftp://ftp.letters.com/src/dmalloc/dmalloc.tar.gz],
[if test "$withval" = yes; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(WITH_DMALLOC)
  LIBS="$LIBS -ldmalloc"
  LDFLAGS="$LDFLAGS -g"
else
  AC_MSG_RESULT(no)
fi], [AC_MSG_RESULT(no)])
])

dnl --- *@-AM_FUNC_ERROR_AT_LINE-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	AM_FUNC_ERROR_AT_LINE
dnl
dnl Arguments:	---
dnl
dnl Use:	Use this if you use the GNU error.[ch].

dnl FIXME: Migrate into libit

AC_DEFUN(AM_FUNC_ERROR_AT_LINE,
[AC_CACHE_CHECK([for error_at_line], am_cv_lib_error_at_line,
 [AC_TRY_LINK([],[error_at_line(0, 0, "", 0, "");],
              am_cv_lib_error_at_line=yes,
              am_cv_lib_error_at_line=no)])
 if test $am_cv_lib_error_at_line = no; then
   LIBOBJS="$LIBOBJS error.o"
 fi
 AC_SUBST(LIBOBJS)dnl
])

dnl --- *@-AM_INIT_GUILE_MODULE-@* ---
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_INIT_GUILE_MODULE(MODNAME)
dnl
dnl Arguments:	MODNAME = value to initialize `module' variable with
dnl
dnl Use:	This macro will automatically get the guile version from the
dnl		top-level srcdir, and will initialize automake.  It also
dnl		defines the `module' variable.

AC_DEFUN([AM_INIT_GUILE_MODULE],[
. $srcdir/../GUILE-VERSION
AM_INIT_AUTOMAKE($PACKAGE, $VERSION)
AC_CONFIG_AUX_DIR(..)
module=[$1]
AC_SUBST(module)])

dnl --- *@-AM_CONFIG_HEADER-@* ---
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_CONFIG_HEADER(HEADER ...)
dnl
dnl Arguments:	HEADER = a header spec, as for AC_CONFIG_HEADER
dnl
dnl Use:	Like AC_CONFIG_HEADER, but automatically create stamp file.

AC_DEFUN(AM_CONFIG_HEADER,
[AC_PREREQ([2.12])
AC_CONFIG_HEADER([$1])
dnl When config.status generates a header, we must update the stamp-h file.
dnl This file resides in the same directory as the config header
dnl that is generated.  We must strip everything past the first ":",
dnl and everything past the last "/".
AC_OUTPUT_COMMANDS(changequote(<<,>>)dnl
ifelse(patsubst(<<$1>>, <<[^ ]>>, <<>>), <<>>,
<<test -z "<<$>>CONFIG_HEADERS" || echo timestamp > patsubst(<<$1>>, <<^\([^:]*/
\)?.*>>, <<\1>>)stamp-h<<>>dnl>>,
<<am_indx=1
for am_file in <<$1>>; do
  case " <<$>>CONFIG_HEADERS " in
  *" <<$>>am_file "*<<)>>
    echo timestamp > `echo <<$>>am_file | sed -e 's%:.*%%' -e 's%[^/]*$%%'`stamp-h$am_indx
    ;;
  esac
  am_indx=`expr "<<$>>am_indx" + 1`
done<<>>dnl>>)
changequote([,]))])

dnl --- *@-AM_INIT_AUTOMAKE-@*
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_INIT_AUTOMAKE(PACKAGE, VERSION, [NO-DEFINE])
dnl
dnl Arguments:	PACKAGE = package name
dnl		VERSION = version number
dnl		NO-DEFINE = if set, don't define package and version number
dnl
dnl Use:	Do all the work for Automake.  This macro actually does too
dnl		much -- some checks are only needed if your package does
dnl		certain things.  But this isn't really a big deal.

# serial 1

AC_DEFUN(AM_INIT_AUTOMAKE,
[AC_REQUIRE([AM_PROG_INSTALL])
PACKAGE=[$1]
AC_SUBST(PACKAGE)
VERSION=[$2]
AC_SUBST(VERSION)
dnl test to see if srcdir already configured
if test "`cd $srcdir && pwd`" != "`pwd`" && test -f $srcdir/config.status; then
  AC_MSG_ERROR([source directory already configured; run "make distclean" there first])
fi
ifelse([$3],,
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE")
AC_DEFINE_UNQUOTED(VERSION, "$VERSION"))
AM_SANITY_CHECK
AC_ARG_PROGRAM
dnl FIXME This is truly gross.
missing_dir=`cd $ac_aux_dir && pwd`
AM_MISSING_PROG(ACLOCAL, aclocal, $missing_dir)
AM_MISSING_PROG(AUTOCONF, autoconf, $missing_dir)
AM_MISSING_PROG(AUTOMAKE, automake, $missing_dir)
AM_MISSING_PROG(AUTOHEADER, autoheader, $missing_dir)
AM_MISSING_PROG(MAKEINFO, makeinfo, $missing_dir)
AC_PROG_MAKE_SET])

dnl --- *@-AM_PROG_INSTALL-@* ---
dnl
dnl Author:	Franc,ois Pinard
dnl
dnl Synopsis:	AM_PROG_INSTALL
dnl
dnl Arguments:	---
dnl
dnl Use:	Calls `AC_PROG_INSTALL' to find an installer.  Then it sets
dnl		`INSTALL_SCRIPT' to a suitable value if necessary.

# serial 1

AC_DEFUN(AM_PROG_INSTALL,
[AC_PROG_INSTALL
test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL} -m 755'
AC_SUBST(INSTALL_SCRIPT)dnl
])

dnl --- *@-AM_PROG_LEX-@* ---
dnl
dnl Author:	Alexandre Oliva
dnl
dnl Synopsis:	AM_PROG_LEX
dnl
dnl Arguments:	---
dnl
dnl Use:	Replacement for AC_PROG_LEX and AC_DECL_YYTEXT

dnl AM_PROG_LEX
dnl Look for flex, lex or missing, then run AC_PROG_LEX and AC_DECL_YYTEXT
AC_DEFUN(AM_PROG_LEX,
[missing_dir=ifelse([$1],,`cd $ac_aux_dir && pwd`,$1)
AC_CHECK_PROGS(LEX, flex lex, "$missing_dir/missing flex")
AC_PROG_LEX
AC_DECL_YYTEXT])

dnl --- *@-AM_PROG_LIBTOOL-@* ---
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_PROG_LIBTOOL
dnl
dnl Arguments:	---
dnl
dnl Use:	Configures `libtool' for the target architecture.

##
## Configure libtool for the target system.
##
# serial 1 AM_PROG_LIBTOOL
AC_DEFUN(AM_PROG_LIBTOOL,
[AC_REQUIRE([AC_CANONICAL_HOST])
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_PROG_RANLIB])

# Always use our own libtool.
LIBTOOL='$(top_builddir)/libtool'
AC_SUBST(LIBTOOL)

dnl Allow the --disable-shared flag to stop us from building shared libs.
AC_ARG_ENABLE(shared,
[  --enable-shared         build shared libraries [default=yes]],
test "$enableval" = no && libtool_shared=" --disable-shared",
libtool_shared=)

libtool_flags="$libtool_shared"
test "$silent" = yes && libtool_flags="$libtool_flags --silent"
test "$ac_cv_prog_gcc" = yes && libtool_flags="$libtool_flags --with-gcc"

# Actually configure libtool.  ac_aux_dir is where install-sh is found.
CC="$CC" CFLAGS="$CFLAGS" CPPFLAGS="$CPPFLAGS" LD="$LD" RANLIB="$RANLIB" \
$ac_aux_dir/ltconfig $libtool_flags --no-verify $ac_aux_dir/ltmain.sh $host \
|| AC_MSG_ERROR([libtool configure failed])
])

dnl --- *@-AM_PATH_LISPDIR-@* ---
dnl
dnl Author:	Ulrich Drepper
dnl
dnl Synopsis:	AM_PATH_LISPDIR
dnl
dnl Arguments:	---
dnl
dnl Use:	Sets the variable `lispdir' to point to a place to install
dnl		Emacs lisp files.

## ------------------------
## Emacs LISP file handling
## From Ulrich Drepper
## ------------------------

# serial 1

AC_DEFUN(AM_PATH_LISPDIR,
 [# If set to t, that means we are running in a shell under Emacs.
  # If you have an Emacs named "t", then use the full path.
  test "$EMACS" = t && EMACS=
  AC_PATH_PROG(EMACS, emacs xemacs, no)
  if test $EMACS != "no"; then
    AC_MSG_CHECKING([where .elc files should go])
    dnl Set default value
    lispdir="\$(datadir)/emacs/site-lisp"
    if test "x$prefix" = "xNONE"; then
      if test -d $ac_default_prefix/share/emacs/site-lisp; then
        lispdir="\$(prefix)/share/emacs/site-lisp"
      else
        if test -d $ac_default_prefix/lib/emacs/site-lisp; then
          lispdir="\$(prefix)/lib/emacs/site-lisp"
        fi
      fi
    else
      if test -d $prefix/share/emacs/site-lisp; then
        lispdir="\$(prefix)/share/emacs/site-lisp"
      else
        if test -d $prefix/lib/emacs/site-lisp; then
          lispdir="\$(prefix)/lib/emacs/site-lisp"
        fi
      fi
    fi
    AC_MSG_RESULT($lispdir)
  fi
  AC_SUBST(lispdir)])

dnl --- *@-AM_MAINTAINTER_MODE-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	jm_MAINTAINER_MODE
dnl
dnl Arguments:	---
dnl
dnl Use:	Provides an option `--enable-maintainer-mode' which turns
dnl		on rules which might normally be commented out.  The
dnl		substitution variable `MAINT' is set to be a comment when
dnl		this option is disabled, which it is by default.

# serial 1

AC_DEFUN(AM_MAINTAINER_MODE,
[AC_MSG_CHECKING([whether to enable maintainer-specific portions of Makefiles])
  dnl maintainer-mode is disabled by default
  AC_ARG_ENABLE(maintainer-mode,
[  --enable-maintainer-mode enable make rules and dependencies not useful
                          (and sometimes confusing) to the casual installer],
      USE_MAINTAINER_MODE=$enableval,
      USE_MAINTAINER_MODE=no)
  AC_MSG_RESULT($USE_MAINTAINER_MODE)
  if test $USE_MAINTAINER_MODE = yes; then
    MAINT=
  else
    MAINT='#M#'
  fi
  AC_SUBST(MAINT)dnl
]
)

dnl --- *@-AM_MISSING_PROG-@* ---
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_MISSING_PROG(NAME, PROGRAM, DIRECTORY)
dnl
dnl Arguments:	NAME = variable to set to the file's location
dnl		PROGRAM = name of program to find
dnl		DIRECTORY = directory to look in
dnl
dnl Use:	Fakes existence of a useful GNU maintainer tool.

AC_DEFUN(AM_MISSING_PROG,
[AC_MSG_CHECKING(for working $2)
# Run test in a subshell; some versions of sh will print an error if
# an executable is not found, even if stderr is redirected.
# Redirect stdin to placate older versions of autoconf.  Sigh.
if ($2 --version) < /dev/null > /dev/null 2>&1; then
   $1=$2
   AC_MSG_RESULT(found)
else
   $1="$3/missing $2"
   AC_MSG_RESULT(missing)
fi
AC_SUBST($1)])

dnl --- *@-AM_FUNC_MKTIME-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	AM_FUNC_MKTIME
dnl
dnl Arguments:	---
dnl
dnl Use:	Checks for a working mktime function.

AC_DEFUN(AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
 AC_CHECK_HEADERS(sys/time.h)
 AC_CACHE_CHECK([for working mktime], am_cv_func_working_mktime,
  [AC_TRY_RUN(
changequote(<<, >>)dnl
<</* Test program from Paul Eggert (eggert@twinsun.com)
   and Tony Leneis (tony@plaza.ds.adp.com).  */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

static time_t time_t_max;

/* Values we'll use to set the TZ environment variable.  */
static const char *const tz_strings[] = {
  NULL, "GMT0", "JST-9", "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
};
#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))

static void
mktime_test (now)
     time_t now;
{
  if (mktime (localtime (&now)) != now)
    exit (1);
  now = time_t_max - now;
  if (mktime (localtime (&now)) != now)
    exit (1);
}

int
main ()
{
  time_t t, delta;
  int i;

  for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
    continue;
  time_t_max--;
  delta = time_t_max / 997; /* a suitable prime number */
  for (i = 0; i < N_STRINGS; i++)
    {
      if (tz_strings[i])
        putenv (tz_strings[i]);

      for (t = 0; t <= time_t_max - delta; t += delta)
        mktime_test (t);
      mktime_test ((time_t) 60 * 60);
      mktime_test ((time_t) 60 * 60 * 24);
    }
  exit (0);
}
              >>,
changequote([, ])dnl
             am_cv_func_working_mktime=yes, am_cv_func_working_mktime=no,
             dnl When crosscompiling, assume mktime is missing or broken.
             am_cv_func_working_mktime=no)
  ])
  if test $am_cv_func_working_mktime = no; then
    LIBOBJS="$LIBOBJS mktime.o"
  fi
])

dnl --- *@-AM_FUNC_OBSTACK-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	AM_FUNC_OBSTACK
dnl
dnl Arguments:	---
dnl
dnl Use:	Checks for GNU obstacks.

AC_DEFUN(AM_FUNC_OBSTACK,
[AC_CACHE_CHECK([for obstacks], am_cv_func_obstack,
 [AC_TRY_LINK([#include "obstack.h"],
              [struct obstack *mem;obstack_free(mem,(char *) 0)],
              am_cv_func_obstack=yes,
              am_cv_func_obstack=no)])
 if test $am_cv_func_obstack = yes; then
   AC_DEFINE(HAVE_OBSTACK)
 else
   LIBOBJS="$LIBOBJS obstack.o"
 fi
])

dnl --- *@-AC_C_PROTOTYPES-@* ---
dnl
dnl Author:	Franc,ois Pinard
dnl
dnl Synopsis:	AC_C_PROTOTYPES
dnl
dnl Arguments:	---
dnl
dnl Use:	If the C compiler understands ANSI C, define `PROTOTYPES',
dnl		and clear the `U' and `ANSI2KNR' variables.  Otherwise, 
dnl		set `U' to be `_' and `ANSI2KNR' to be `./ansi2knr'.

# serial 1

AC_DEFUN(fp_C_PROTOTYPES,
[AC_REQUIRE([fp_PROG_CC_STDC])
AC_MSG_CHECKING([for function prototypes])
if test "$ac_cv_prog_cc_stdc" != no; then
  AC_MSG_RESULT(yes)
  AC_DEFINE(PROTOTYPES)
  U= ANSI2KNR=
else
  AC_MSG_RESULT(no)
  U=_ ANSI2KNR=./ansi2knr
fi
AC_SUBST(U)dnl
AC_SUBST(ANSI2KNR)dnl
])

dnl --- *@-AM_PATH_GTK-@* ---
dnl
dnl Author:	Owen Taylor
dnl
dnl Synopsis:	AM_PATH_GTK(MIN-VERSION, [ACTION-IF-FOUND], [ACTION-IF-NOT])
dnl
dnl Arguments:	MIN-VERSION = minimum version of GTK required
dnl		ACTION-IF-FOUND = executed if GTK found OK
dnl		ACTION-IF-NOT-FOUND = what to do if GTK not available
dnl
dnl Use:	Sets up compilation environment suitably for GTK programming.

# Configure paths for GTK+
# Owen Taylor     97-11-3

dnl AM_PATH_GTK([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for GTK, and define GTK_CFLAGS and GTK_LIBS
dnl
AC_DEFUN(AM_PATH_GTK,
[dnl 
dnl Get the cflags and libraries from the gtk-config script
dnl
AC_ARG_WITH(gtk-prefix,[  --with-gtk-prefix=PFX   Prefix where GTK is installed (optional)],
            gtk_config_prefix="$withval", gtk_config_prefix="")
AC_ARG_WITH(gtk-exec-prefix,[  --with-gtk-exec-prefix=PFX Exec prefix where GTK is installed (optional)],
            gtk_config_exec_prefix="$withval", gtk_config_exec_prefix="")
AC_ARG_ENABLE(gtktest, [  --disable-gtktest       Do not try to compile and run a test GTK program],
		    , enable_gtktest=yes)

  if test x$gtk_config_exec_prefix != x ; then
     gtk_config_args="$gtk_config_args --exec-prefix=$gtk_config_exec_prefix"
     if test x${GTK_CONFIG+set} != xset ; then
        GTK_CONFIG=$gtk_config_exec_prefix/bin/gtk-config
     fi
  fi
  if test x$gtk_config_prefix != x ; then
     gtk_config_args="$gtk_config_args --prefix=$gtk_config_prefix"
     if test x${GTK_CONFIG+set} != xset ; then
        GTK_CONFIG=$gtk_config_prefix/bin/gtk-config
     fi
  fi

  AC_PATH_PROG(GTK_CONFIG, gtk-config, no)
  min_gtk_version=ifelse([$1], ,0.99.7,$1)
  AC_MSG_CHECKING(for GTK - version >= $min_gtk_version)
  no_gtk=""
  if test "$GTK_CONFIG" = "no" ; then
    no_gtk=yes
  else
    GTK_CFLAGS=`$GTK_CONFIG $gtk_config_args --cflags`
    GTK_LIBS=`$GTK_CONFIG $gtk_config_args --libs`
    gtk_config_major_version=`$GTK_CONFIG $gtk_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    gtk_config_minor_version=`$GTK_CONFIG $gtk_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    gtk_config_micro_version=`$GTK_CONFIG $gtk_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    if test "x$enable_gtktest" = "xyes" ; then
      ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $GTK_CFLAGS"
      LIBS="$LIBS $GTK_LIBS"
dnl
dnl Now check if the installed GTK is sufficiently new. (Also sanity
dnl checks the results of gtk-config to some extent
dnl
      rm -f conf.gtktest
      AC_TRY_RUN([
#include <gtk/gtk.h>
#include <stdio.h>

int 
main ()
{
  int major, minor, micro;
  char *tmp_version;

  system ("touch conf.gtktest");

  /* HP/UX 9 (%@#!) writes to sscanf strings */
  tmp_version = g_strdup("$min_gtk_version");
  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
     printf("%s, bad version string\n", "$min_gtk_version");
     exit(1);
   }

  if ((gtk_major_version != $gtk_config_major_version) ||
      (gtk_minor_version != $gtk_config_minor_version) ||
      (gtk_micro_version != $gtk_config_micro_version))
    {
      printf("\n*** 'gtk-config --version' returned %d.%d.%d, but GTK+ (%d.%d.%d)\n", 
             $gtk_config_major_version, $gtk_config_minor_version, $gtk_config_micro_version,
             gtk_major_version, gtk_minor_version, gtk_micro_version);
      printf ("*** was found! If gtk-config was correct, then it is best\n");
      printf ("*** to remove the old version of GTK+. You may also be able to fix the error\n");
      printf("*** by modifying your LD_LIBRARY_PATH enviroment variable, or by editing\n");
      printf("*** /etc/ld.so.conf. Make sure you have run ldconfig if that is\n");
      printf("*** required on your system.\n");
      printf("*** If gtk-config was wrong, set the environment variable GTK_CONFIG\n");
      printf("*** to point to the correct copy of gtk-config, and remove the file config.cache\n");
      printf("*** before re-running configure\n");
    } 
  else
    {
      if ((gtk_major_version > major) ||
        ((gtk_major_version == major) && (gtk_minor_version > minor)) ||
        ((gtk_major_version == major) && (gtk_minor_version == minor) && (gtk_micro_version >= micro)))
      {
        return 0;
       }
     else
      {
        printf("\n*** An old version of GTK+ (%d.%d.%d) was found.\n",
               gtk_major_version, gtk_minor_version, gtk_micro_version);
        printf("*** You need a version of GTK+ newer than %d.%d.%d. The latest version of\n",
	       major, minor, micro);
        printf("*** GTK+ is always available from ftp://ftp.gtk.org.\n");
        printf("***\n");
        printf("*** If you have already installed a sufficiently new version, this error\n");
        printf("*** probably means that the wrong copy of the gtk-config shell script is\n");
        printf("*** being found. The easiest way to fix this is to remove the old version\n");
        printf("*** of GTK+, but you can also set the GTK_CONFIG environment to point to the\n");
        printf("*** correct copy of gtk-config. (In this case, you will have to\n");
        printf("*** modify your LD_LIBRARY_PATH enviroment variable, or edit /etc/ld.so.conf\n");
        printf("*** so that the correct libraries are found at run-time))\n");
      }
    }
  return 1;
}
],, no_gtk=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CFLAGS="$ac_save_CFLAGS"
       LIBS="$ac_save_LIBS"
     fi
  fi
  if test "x$no_gtk" = x ; then
     AC_MSG_RESULT(yes)
     ifelse([$2], , :, [$2])     
  else
     AC_MSG_RESULT(no)
     if test "$GTK_CONFIG" = "no" ; then
       echo "*** The gtk-config script installed by GTK could not be found"
       echo "*** If GTK was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the GTK_CONFIG environment variable to the"
       echo "*** full path to gtk-config."
     else
       if test -f conf.gtktest ; then
        :
       else
          echo "*** Could not run GTK test program, checking why..."
          CFLAGS="$CFLAGS $GTK_CFLAGS"
          LIBS="$LIBS $GTK_LIBS"
          AC_TRY_LINK([
#include <gtk/gtk.h>
#include <stdio.h>
],      [ return ((gtk_major_version) || (gtk_minor_version) || (gtk_micro_version)); ],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding GTK or finding the wrong"
          echo "*** version of GTK. If it is not finding GTK, you'll need to set your"
          echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
          echo "*** to the installed location  Also, make sure you have run ldconfig if that"
          echo "*** is required on your system"
	  echo "***"
          echo "*** If you have an old version installed, it is best to remove it, although"
          echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"
          echo "***"
          echo "*** If you have a RedHat 5.0 system, you should remove the GTK package that"
          echo "*** came with the system with the command"
          echo "***"
          echo "***    rpm --erase --nodeps gtk gtk-devel" ],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means GTK was incorrectly installed"
          echo "*** or that you have moved GTK since it was installed. In the latter case, you"
          echo "*** may want to edit the gtk-config script: $GTK_CONFIG" ])
          CFLAGS="$ac_save_CFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi
     GTK_CFLAGS=""
     GTK_LIBS=""
     ifelse([$3], , :, [$3])
  fi
  AC_SUBST(GTK_CFLAGS)
  AC_SUBST(GTK_LIBS)
  rm -f conf.gtktest
])

dnl --- *@-AC_TYPE_PTRDIFF_T-@* ---
dnl
dnl Author:	Ulrich Drepper
dnl
dnl Synopsis:	AC_TYPE_PTRDIFF_T
dnl
dnl Arguments:	---
dnl
dnl Use:	Sets HAVE_PTRDIFF_T if the type exists.

AC_DEFUN(AM_TYPE_PTRDIFF_T,
  [AC_CACHE_CHECK([for ptrdiff_t], am_cv_type_ptrdiff_t,
     [AC_TRY_COMPILE([#include <stddef.h>], [ptrdiff_t p],
                     am_cv_type_ptrdiff_t=yes, am_cv_type_ptrdiff_t=no)])
   if test $am_cv_type_ptrdiff_t = yes; then
     AC_DEFINE(HAVE_PTRDIFF_T)
   fi
])

dnl --- *@-AM_WITH_REGEX-@* ---
dnl
dnl Author:	Unknown (possibly Franc,ois Pinard)
dnl
dnl Synopsis:	AM_WITH_REGEX
dnl
dnl Arguments:	---
dnl
dnl Use:
dnl		The idea is to distribute rx.[hc] and regex.[hc] together,
dnl		for a while.  The WITH_REGEX symbol (which should also be
dnl		documented in acconfig.h) is used to decide which of regex.h
dnl		or rx.h should be included in the application.  If
dnl		`./configure --with-regex' is given (the default), the
dnl		package will use gawk's regex.  If `./configure
dnl		--without-regex', a check is made to see if rx is already
dnl		installed, as with newer Linux'es.  If not found, the package
dnl		will use the rx from the distribution.  If found, the package
dnl		will use the system's rx which, on Linux at least, will
dnl		result in a smaller executable file.

AC_DEFUN(AM_WITH_REGEX,
[AC_MSG_CHECKING(which of GNU rx or gawk's regex is wanted)
AC_ARG_WITH(regex,
[  --without-regex         use GNU rx in lieu of gawk's regex for matching],
[test "$withval" = yes && am_with_regex=1],
[am_with_regex=1])
if test -n "$am_with_regex"; then
  AC_MSG_RESULT(regex)
  AC_DEFINE(WITH_REGEX)
  AC_CACHE_CHECK([for GNU regex in libc], am_cv_gnu_regex,
    AC_TRY_LINK([], [extern int re_max_failures; re_max_failures = 1],
                am_cv_gnu_regex=yes, am_cv_gnu_regex=no))
  if test $am_cv_gnu_regex = no; then
    LIBOBJS="$LIBOBJS regex.o"
  fi
else
  AC_MSG_RESULT(rx)
  AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.o"])
fi
AC_SUBST(LIBOBJS)dnl
])

dnl --- *@-AM_SANITY_CHECK-@*
dnl
dnl Author:	Unknown
dnl
dnl Synopsis:	AM_SANITY_CHECK
dnl
dnl Arguments:	---
dnl
dnl Use:	Check for build environment sanity.

AC_DEFUN(AM_SANITY_CHECK,
[AC_MSG_CHECKING([whether build environment is sane])
# Just in case
sleep 1
echo timestamp > conftestfile
# Do `set' in a subshell so we don't clobber the current shell's
# arguments.  Must try -L first in case configure is actually a
# symlink; some systems play weird games with the mod time of symlinks
# (eg FreeBSD returns the mod time of the symlink's containing
# directory).
if (
   set X `ls -Lt $srcdir/configure conftestfile 2> /dev/null`
   if test "$@" = "X"; then
      # -L didn't work.
      set X `ls -t $srcdir/configure conftestfile`
   fi
   test "[$]2" = conftestfile
   )
then
   # Ok.
   :
else
   AC_MSG_ERROR([newly created file is older than distributed files!
Check your system clock])
fi
rm -f conftest*
AC_MSG_RESULT(yes)])

dnl --- *@-AM_FUNC_STRDOD-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	AM_FUNC_STRTOD
dnl
dnl Arguments:	---
dnl
dnl Use:	Checks for a working strtod function.

## Copyright (C) 1996 Free Software Foundation, Inc.

## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.

## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.

## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.

## From Jim Meyering.

## serial 1

## @defmac AC_FUNC_STRTOD
## @maindex FUNC_STRTOD
## @ovindex LIBOBJS
## If the @code{strtod} function is not available, or does not work
## correctly (like the one on SunOS 5.4), add @samp{strtod.o} to output
## variable @code{LIBOBJS}.
## @end defmac

AC_DEFUN(AM_FUNC_STRTOD,
[AC_CACHE_CHECK(for working strtod, am_cv_func_strtod,
[AC_TRY_RUN([
double strtod ();
int
main()
{
  {
    /* Some versions of Linux strtod mis-parse strings with leading '+'.  */
    char *string = " +69";
    char *term;
    double value;
    value = strtod (string, &term);
    if (value != 69 || term != (string + 4))
      exit (1);
  }

  {
    /* Under Solaris 2.4, strtod returns the wrong value for the
       terminating character under some conditions.  */

## @defmac AC_FUNC_STRTOD
## @maindex FUNC_STRTOD
## @ovindex LIBOBJS
## If the @code{strtod} function is not available, or does not work
## correctly (like the one on SunOS 5.4), add @samp{strtod.o} to output
## variable @code{LIBOBJS}.
## @end defmac

AC_DEFUN(AM_FUNC_STRTOD,
[AC_CACHE_CHECK(for working strtod, am_cv_func_strtod,
[AC_TRY_RUN([
double strtod ();
int
main()
{
  {
    /* Some versions of Linux strtod mis-parse strings with leading '+'.  */
    char *string = " +69";
    char *term;
    double value;
    value = strtod (string, &term);
    if (value != 69 || term != (string + 4))
      exit (1);
  }

  {
    /* Under Solaris 2.4, strtod returns the wrong value for the
       terminating character under some conditions.  */
    char *string = "NaN";
    char *term;
    strtod (string, &term);
    if (term != string && *(term - 1) == 0)
      exit (1);
  }
  exit (0);
}
], am_cv_func_strtod=yes, am_cv_func_strtod=no, am_cv_func_strtod=no)])
test $am_cv_func_strtod = no && LIBOBJS="$LIBOBJS strtod.o"
AC_SUBST(LIBOBJS)dnl
am_cv_func_strtod_needs_libm=no
if test $am_cv_func_strtod = no; then
  AC_CHECK_FUNCS(pow)
  if test $ac_cv_func_pow = no; then
    AC_CHECK_LIB(m, pow, [am_cv_func_strtod_needs_libm=yes],
                 [AC_MSG_WARN(can't find library containing definition of pow)])
  fi
fi
])

dnl --- *@-AM_SYS_POSIX_TERMIOS-@* ---
dnl
dnl Author:	Jim Meyering
dnl
dnl Synopsis:	AM_SYS_POSIX_TERMIOS
dnl
dnl Arguments:	---
dnl
dnl Use:	Checks for a POSIX termios.h.

AC_DEFUN(AM_SYS_POSIX_TERMIOS,
[AC_CACHE_CHECK([POSIX termios], am_cv_sys_posix_termios,
  [AC_TRY_LINK([#include <sys/types.h>
#include <unistd.h>
#include <termios.h>],
  [/* SunOS 4.0.3 has termios.h but not the library calls.  */
   tcgetattr(0, 0);],
  am_cv_sys_posix_termios=yes,
  am_cv_sys_posix_termios=no)])
])

dnl----- Macros by Mark Wooding ------------------------------ *@--IGNORE--@*

dnl --- *@-mdw_REQUIRE-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_REQUIRE(MACRO, ARGS...)
dnl
dnl Arguments:	MACRO = name of a macro which should have been called
dnl		ARGS = arguments to pass
dnl
dnl Use:	Like `AC_REQUIRE', only it handles arguments.

AC_DEFUN(mdw_REQUIRE,
[ifdef([AC_PROVIDE_$1], ,
[AC_DIVERT_PUSH(builtin(eval, AC_DIVERSION_CURRENT - 1))dnl
indir($@)
AC_DIVERT_POP()dnl
])])

dnl --- *@-mdw_CURSES-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_CURSES
dnl
dnl Arguments:	---
dnl
dnl Use:	Searches for a `curses' library (one of `ncurses' or
dnl		`curses') using mdw_CHECK_MANYLIBS.  If one is found, the
dnl		preprocessor macro HAVE_CURSES is defined, and a search is
dnl		made for a `curses' header file (one of <ncurses.h>,
dnl		<ncurses/ncurses.h> or <curses.h>) using AC_CHECK_HEADERS
dnl		and the appropriate preprocessor symbol is defined.
dnl		Finally, a check is made for the function `wresize' using
dnl		AC_CHECK_FUNCS.

AC_DEFUN(mdw_CURSES,
[mdw_CHECK_MANYLIBS(newwin, ncurses curses, AC_DEFINE(HAVE_CURSES))
if test $mdw_cv_lib_newwin != no; then
AC_CHECK_HEADERS([ncurses.h ncurses/ncurses.h curses.h], [break])
if test "$ac_cv_header_ncurses_h" = "no" &&
   test "$ac_cv_header_ncurses_ncurses_h" = "no" &&
   test "$ac_cv_header_curses_h" = "no"; then
     AC_MSG_WARN([couldn't find a \`curses' header.  Assuming \`curses.h'.])
     AC_DEFINE(HAVE_CURSES_H)
fi
AC_CHECK_FUNCS(wresize)
fi])

dnl --- *@-mdw_TYPE_SSIZE_T-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_TYPE_SSIZE_T
dnl
dnl Arguments:	---
dnl
dnl Use:	Checks whether the Posix type `ssize_t' is defined.  If not,
dnl		it defaults to `int'.

AC_DEFUN(mdw_TYPE_SSIZE_T,
[AC_REQUIRE([AC_HEADER_STDC])
AC_CACHE_CHECK(for ssize_t, mdw_cv_ssize_t,
[AC_EGREP_CPP(ssize_t,
[#include <sys/types.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif],
[mdw_cv_ssize_t=yes], [mdw_cv_ssize_t=no])])
if test $mdw_cv_ssize_t = no; then
  AC_DEFINE(ssize_t, int)
fi])

dnl --- *@-mdw_DECL_ENVIRON-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_DECL_ENVIRON
dnl
dnl Arguments:	---
dnl
dnl Use:	Searches for a declaration of the global `environ' variable.
dnl		If one is found in one of the `usual' places, DECL_ENVIRON
dnl		is defined as a preprocessor symbol.

AC_DEFUN(mdw_DECL_ENVIRON,
[AC_CACHE_CHECK([for declaration of \`environ'], mdw_cv_environ,
[AC_EGREP_CPP(environ, 
[#include <sys/types.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if STDC_HEADERS
#include <stdlib.h>
#include <stddef.h>
#endif], [mdw_cv_environ=yes], [mdw_cv_environ=no])])
if test $mdw_cv_environ = yes; then
  AC_DEFINE(DECL_ENVIRON)
fi])

dnl --- *@-mdw_CHECK_MANYLIBS-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_CHECK_MANYLIBS(FUNC, LIBS, [IF-FOUND], [IF-NOT-FOUND])
dnl
dnl Arguments:	FUNC = a function to try to find
dnl		LIBS = a whitespace-separated list of libraries to search
dnl		IF-FOUND = what to do when the function is found
dnl		IF-NOT-FOUND = what to do when the function isn't found
dnl
dnl Use:	Searches for a library which defines FUNC.  It first tries
dnl		without any libraries; then it tries each library specified
dnl		in LIBS in turn.  If it finds a match, it adds the
dnl		appropriate library to `LIBS'.
dnl
dnl		This is particularly handy under DIREIX: if you link with
dnl		`-lnsl' then you get non-NIS-aware versions of getpwnam and
dnl		so on, which is clearly a Bad Thing.

AC_DEFUN(mdw_CHECK_MANYLIBS,
[AC_CACHE_CHECK([for library containing $1], [mdw_cv_lib_$1],
[mdw_save_LIBS="$LIBS"
mdw_cv_lib_$1="no"
AC_TRY_LINK(,[$1()], [mdw_cv_lib_$1="none required"])
test "$mdw_cv_lib_$1" = "no" && for i in $2; do
LIBS="-l$i $mdw_save_LIBS"
AC_TRY_LINK(,[$1()],
[mdw_cv_lib_$1="-l$i"
break])
done
LIBS="$mdw_save_LIBS"])
if test "$mdw_cv_lib_$1" != "no"; then
  test "$mdw_cv_lib_$1" = "none required" || LIBS="$mdw_cv_lib_$1 $LIBS"
  $3
else :
  $4
fi])

dnl --- *@-mdw__PERL_VERSION-@* ---
dnl
dnl AC_DEFUN relies on `[', `]' being quotes, so I have to drop down a level.

changequote(<<, >>)
define(mdw__PERL_VERSION, <<$1 -e 'exit ($] < $2);' >&5 2>&5>>)
changequote([, ])

dnl --- *@-mdw_PROG_PERL-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_PROG_PERL(VERSION, [IF-FOUND], [IF-NOT-FOUND])
dnl
dnl Arguments:	VERSION = version number of Perl required
dnl		IF-FOUND = what to do if it's found
dnl		IF-NOT-FOUND = what to do if it isn't
dnl
dnl Use:	Attempts to find a working version of Perl with a late
dnl		enough version number.  It supplies an option `--with-perl'
dnl		to allow the user to provide a Perl interpreter.  If one
dnl		isn't provided explicitly, it searches for `perl' and `perl5'
dnl		in the current PATH, asking them whether they have a late
dnl		enough version number.  The path of the working Perl is
dnl		put into the `PERL' environment variable; `AC_SUBST' is used
dnl		to substitute its value into Perl scripts.  If there is no
dnl		Perl to be found, the value of `PERL' is set to be `none'.

AC_DEFUN(mdw_PROG_PERL,
[AC_ARG_WITH([perl],
[  --with-perl=PERL	  specify path to Perl version $1 or newer],
[PERL="$withval"],
if test -z "$PERL"; then
[AC_CACHE_CHECK([for Perl version $1 or later], mdw_cv_prog_perl,
[mdw_cv_prog_perl="none"
for p in `echo "$PATH:/usr/local/bin" | tr ":" " "`; do
  case $p in /*) ;; *) p=`pwd`/$p ;; esac
  if mdw__PERL_VERSION(["$p/perl"], $1); then
    mdw_cv_prog_perl="$p/perl"
    break
  fi
  if mdw__PERL_VERSION(["$p/perl5"], $1); then
    mdw_cv_prog_perl="$p/perl5"
    break
  fi
done])
PERL="$mdw_cv_prog_perl"])
fi

AC_SUBST(PERL)dnl
if test "$PERL" = "none"; then :
  $3
else :
  $2
fi])

dnl --- *@-mdw_CHECK_PERL-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_CHECK_PERL(VERSION)
dnl
dnl Arguments:	VERSION = version number of Perl required
dnl
dnl Use:	Verifies that the Perl interpreter in the `PERL' shell
dnl		variable actually works and is of the right version.  If it's
dnl		not, an error is raised and configuration is aborted.

AC_DEFUN(mdw_CHECK_PERL,
[mdw_REQUIRE([mdw_PROG_PERL], [$1])
AC_MSG_CHECKING([whether Perl ($PERL) works])
if test "$PERL" != "none" && mdw__PERL_VERSION("$PERL", $1); then
  AC_MSG_RESULT([yes])
else
  AC_MSG_RESULT([no])
  AC_MSG_ERROR([Perl version $1 or newer not found.
If you have a recent enough Perl, and I just failed to find it, try using
the --with-perl=PERL option to give me an explicit pathname.])
fi])

dnl --- *@-mdw_PERLLIB_CHECK-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_PERLLIB_CHECK(LIBRARY)
dnl
dnl Arguments:	LIBRARY = name of a Perl library to check for
dnl
dnl Use:	Ensures that a Perl script can `use LIBRARY;'.  If it can,
dnl		all's well and good; if it can't, `LIBRARY.pm' is added to
dnl		the variable `NEEDED_PERLLIBS' and a line which adds 
dnl		`pkgdatadir' to Perl's `@INC' array is placed in the
dnl		variable `INC_PERLLIBS'; `AC_SUBST' is called for both of
dnl		these variables.  It's expected that `NEEDED_PERLLIBS' will
dnl		be used in the `Makefile.in' to decide which versions from
dnl		the distribution need installing.
dnl
dnl		This macro isn't terribly useful in the general case.  It
dnl		Also implicitly assumes that `$PERL' is Perl 5 or later.

AC_DEFUN(mdw__PERLLIB_INIT,
[AC_SUBST(INC_PERLLIBS)dnl
AC_SUBST(NEEDED_PERLLIBS)dnl
])

AC_DEFUN(mdw_PERLLIB_CHECK,
[AC_REQUIRE([mdw__PERLLIB_INIT])
mdw_REQUIRE([mdw_CHECK_PERL], 5)
AC_CACHE_CHECK([for Perl library $1], mdw_cv_perllib_$1,
[if $PERL -e 'use $1;' >&5 2>&5; then
  mdw_cv_perllib_$1="yes"
else
  mdw_cv_perllib_$1="no"
fi])

if test "$mdw_cv_perllib_$1" = "no"; then
  NEEDED_PERLLIBS="$NEEDED_PERLLIBS $1.pm"

  # --- Deal with autoconf lossage ---
  #
  # It doesn't want to define `prefix' until rather later on, so I have
  # to bodge it here.

  if test -z "$INC_PERLLIBS"; then
    mdw_old_prefix="$prefix"
    test "$prefix" = "NONE" && prefix="$ac_default_prefix";
    INC_PERLLIBS="BEGIN { push @INC, \"`eval echo $datadir/$PACKAGE`\"; }"
    prefix="$mdw_old_prefix";
  fi
fi])

dnl --- *@-mdw_GCC_FLAGS-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_GCC_FLAGS([FLAGS], [CFLAGS], [C++FLAGS])
dnl
dnl Arguments:	FLAGS = GCC compiler flags to add (default is 
dnl			`-pedantic -Wall')
dnl		CFLAGS = GCC C compiler flags to add (default is empty)
dnl		C++FLAGS = GCC C++ compiler flags to add (default is
dnl			`-fhandle-exceptions').
dnl
dnl Use:	If the C compiler is GCC, add the compiler flags.

AC_DEFUN(mdw_GCC_FLAGS,
[if test "$GCC" = "yes"; then
  CFLAGS="$CFLAGS ifelse([$1], [], [-pedantic -Wall], [$1])"
  CFLAGS="$CFLAGS ifelse([$2], [], [], [$2])"
fi
if test "$GXX" = "yes"; then
  CXXFLAGS="$CXXFLAGS ifelse([$1], [], [-pedantic -Wall], [$1])"
  CXXFLAGS="$CXXFLAGS ifelse([$3], [], [-fhandle-exceptions], [$3])"
fi])

dnl *@-mdw_MLIB-@*
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_MLIB(VERSION, IF-FOUND, IF-NOT-FOUND
dnl
dnl Arguments:	VERSION = version of library required
dnl		IF-FOUND = what to do if found
dnl		IF-NOT-FOUND = what to do if not found	
dnl
dnl Use:	Configures an mLib client program.  The default
dnl		version is 1.0.0pre0; the default action is to add
dnl		everything to the CFLAGS and LIBS variables, and complain
dnl		if the library couldn't be found.
dnl
dnl		The variable MLIB_VERSION contains the version number of
dnl		the library; MLIB_CFLAGS is the C compiler flags required
dnl		and MLIB_LIBS is the linker flags.

AC_DEFUN([mdw_MLIB],
[AC_MSG_CHECKING([for mLib library])
if mLib-config --check $1 >/dev/null 2>&1; then
  MLIB_VERSION=`mLib-config --version`
  MLIB_CFLAGS=`mLib-config --cflags`
  MLIB_LIBS=`mLib-config --libs`
  AC_SUBST(MLIB_VERSION) AC_SUBST(MLIB_CFLAGS) AC_SUBST(MLIB_LIBS)
  ifelse([$2], [],
  [CFLAGS="$CFLAGS $MLIB_CFLAGS"
  LIBS="$MLIB_LIBS $LIBS"],
  $2)
  AC_MSG_RESULT([$MLIB_VERSION])
else
  ifelse([$3], [],
  AC_MSG_ERROR([mLib library not found or too old.]),
  $3)
  AC_MSG_RESULT([not found])
fi])

dnl *@-mdw_CATACOMB-@*
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_CATACOMB([VERSION], [IF-FOUND], [IF-NOT-FOUND])
dnl
dnl Arguments:	VERSION = version of Catacomb required
dnl		IF-FOUND = what to do if found
dnl		IF-NOT-FOUND = what to do if not found	
dnl
dnl Use:	Configures the program as a Catacomb client.  The default
dnl		version is 1.0.0pre0; the default action is to add
dnl		everything to the CFLAGS and LIBS variables, and complain
dnl		if the library couldn't be found.
dnl
dnl		The variable CATACOMB_VERSION contains the version number of
dnl		the library; CATACOMB_CFLAGS is the C compiler flags required
dnl		and CATACOMB_LIBS is the linker flags.

AC_DEFUN([mdw_CATACOMB],
[mdw_REQUIRE([mdw_MLIB], [1.5.0])
AC_MSG_CHECKING([for Catacomb library])
if catacomb-config --check $1 >/dev/null 2>&1; then
  CATACOMB_VERSION=`catacomb-config --version`
  CATACOMB_CFLAGS=`catacomb-config --cflags`
  CATACOMB_LIBS=`catacomb-config --libs`
  AC_SUBST(CATACOMB_VERSION)
  AC_SUBST(CATACOMB_CFLAGS) AC_SUBST(CATACOMB_LIBS)
  ifelse([$2], [],
  [CFLAGS="$CFLAGS $CATACOMB_CFLAGS"
  LIBS="$CATACOMB_LIBS $LIBS"],
  $2)
  AC_MSG_RESULT([$CATACOMB_VERSION])
else
  ifelse([$3], [],
  AC_MSG_ERROR([Catacomb library not found or too old.]),
  $3)
  AC_MSG_RESULT([not found])
fi])

dnl --- *@-mdw_OPT_NDEBUG-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_OPT_NDEBUG
dnl
dnl Arguments:	---
dnl
dnl Use:	Turns off the `NDEBUG' flag if the user wants to do
dnl		debugging.

AC_DEFUN(mdw_OPT_NDEBUG,
[AC_ARG_ENABLE(debugging,
[  --enable-debugging      spews vast swathes of useless information],
[if test "$enableval" = "no"; then
  AC_DEFINE(NDEBUG, 1)
fi],
[AC_DEFINE(NDEBUG, 1)])])

dnl --- *@-mdw_OPT_EFENCE-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_OPT_EFENCE
dnl
dnl Arguments:	---
dnl
dnl Use:	Links with the Electric Fence library.

AC_DEFUN(mdw_OPT_EFENCE,
[AC_ARG_WITH(electric-fence,
[  --with-electric-fence   link programs with Electric Fence],
[if test "$withval" = "yes"; then
  AC_CHECK_LIB(efence, malloc)
fi])])

dnl --- *@-mdw_OPT_mLib_DEBUG-@* ---
dnl
dnl Author:	Mark Wooding
dnl
dnl Synopsis:	mdw_OPT_mLib_DEBUG(PROGRAM)
dnl
dnl Arguments:	---
dnl
dnl Use:	Provides options for mLib debugging.  In particular, the
dnl		following are defined:
dnl
dnl		  --enable-tracing	  turns off the NTRACE variable
dnl		  --enable-track	  turns on malloc tracking
dnl		  --enable-blame-PROGRAM  tracks malloc contexts in PROGRAM
dnl
dnl		There must be  a separate `blame' option, so that the various
dnl		blame options work properly.

AC_DEFUN(mdw_OPT_mLib_DEBUG,
[mdw_OPT_NDEBUG
mdw_OPT_EFENCE

AC_ARG_ENABLE(tracing,
[  --enable-tracing        enable output of tracing information],
[if test "$enableval" = "no"; then
  AC_DEFINE(NTRACE, 1)
fi],
[AC_DEFINE(NTRACE, 1)])

AC_ARG_ENABLE(track,
[  --enable-track          enable tracking of malloc and free],
[AC_DEFINE(TRACK_ENABLE, 1)])

AC_ARG_ENABLE(blame-$1,
[  --enable-blame-$1
                          track malloc contexts while in $1],
[AC_DEFINE(TRACK_BLAME, 1)])])

dnl----- That's all, folks --------------------------------- *@--GLOB-END--@*