File: acinclude.m4

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dnl @synopsis AC_DEFINE_DIR(VARNAME, DIR [, DESCRIPTION])
dnl
dnl This macro _AC_DEFINEs VARNAME to the expansion of the DIR
dnl variable, taking care of fixing up ${prefix} and such.
dnl
dnl Note that the 3 argument form is only supported with autoconf 2.13 and
dnl later (i.e. only where _AC_DEFINE supports 3 arguments).
dnl
dnl Examples:
dnl
dnl    AC_DEFINE_DIR(DATADIR, datadir)
dnl    AC_DEFINE_DIR(PROG_PATH, bindir, [Location of installed binaries])
dnl
dnl @version $Id: acinclude.m4 2635 2008-06-30 16:28:54Z mbanck $
dnl @author Guido Draheim <guidod@gmx.de>, original by Alexandre Oliva

AC_DEFUN([AC_DEFINE_DIR], [
  test "x$prefix" = xNONE && prefix="$ac_default_prefix"
  test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
  ac_define_dir=`eval echo [$]$2`
  ac_define_dir=`eval echo [$]ac_define_dir`
  ifelse($3, ,
    AC_DEFINE_UNQUOTED($1, "$ac_define_dir"),
    AC_DEFINE_UNQUOTED($1, "$ac_define_dir", $3))
])

dnl @synopsis CHECK_ZLIB()
dnl
dnl This macro searches for an installed zlib library. If nothing was
dnl specified when calling configure, it searches first in /usr/local
dnl and then in /usr. If the --with-zlib=DIR is specified, it will try
dnl to find it in DIR/include/zlib.h and DIR/lib/libz.a. If
dnl --without-zlib is specified, the library is not searched at all.
dnl
dnl If either the header file (zlib.h) or the library (libz) is not
dnl found, the configuration exits on error, asking for a valid zlib
dnl installation directory or --without-zlib.
dnl
dnl The macro defines the symbol HAVE_LIBZ if the library is found. You
dnl should use autoheader to include a definition for this symbol in a
dnl config.h file. Sample usage in a C/C++ source is as follows:
dnl
dnl   #ifdef HAVE_LIBZ
dnl   #include <zlib.h>
dnl   #endif /* HAVE_LIBZ */
dnl
dnl @category InstalledPackages
dnl @author Loic Dachary <loic@senga.org>
dnl @version 2004-09-20
dnl @license GPLWithACException

AC_DEFUN([CHECK_ZLIB],
#
# Handle user hints
#
[AC_MSG_CHECKING(if zlib is wanted)
AC_ARG_WITH(zlib,
[  --with-zlib=DIR root directory path of zlib installation [defaults to
                    /usr/local or /usr if not found in /usr/local]
  --without-zlib to disable zlib usage completely],
[if test "$withval" != no ; then
  AC_MSG_RESULT(yes)
  if test -d "$withval"
  then
    ZLIB_HOME="$withval"
  else
    AC_MSG_WARN([Sorry, $withval does not exist, checking usual places])
    ZLIB_HOME=/usr/local
  fi

if test ! -f "${ZLIB_HOME}/include/zlib.h"
then
        ZLIB_HOME=/usr
fi

else # --without-zlib
  AC_MSG_RESULT(no)
fi])

#
# Locate zlib, if wanted
#
if test -n "${ZLIB_HOME}"
then
        ZLIB_OLD_LDFLAGS=$LDFLAGS
        ZLIB_OLD_CPPFLAGS=$LDFLAGS
        LDFLAGS="$LDFLAGS -L${ZLIB_HOME}/lib"
        CPPFLAGS="$CPPFLAGS -I${ZLIB_HOME}/include"
        AC_LANG_SAVE
        AC_LANG_C
        AC_CHECK_LIB(z, inflateEnd, [zlib_cv_libz=yes], [zlib_cv_libz=no])
        AC_CHECK_HEADER(zlib.h, [zlib_cv_zlib_h=yes], [zlib_cv_zlib_h=no])
        AC_LANG_RESTORE
        if test "$zlib_cv_libz" = "yes" -a "$zlib_cv_zlib_h" = "yes"
        then
                #
                # If both library and header were found, use them
                #
                AC_CHECK_LIB(z, inflateEnd)
                AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
                AC_MSG_RESULT(ok)
        else
                #
                # If either header or library was not found, revert and bomb
                #
                AC_MSG_CHECKING(zlib in ${ZLIB_HOME})
                LDFLAGS="$ZLIB_OLD_LDFLAGS"
                CPPFLAGS="$ZLIB_OLD_CPPFLAGS"
                AC_MSG_RESULT(failed)
                AC_MSG_ERROR(either specify a valid zlib installation with --with-zlib=DIR or disable zlib usage with --without-zlib)
        fi
fi

])


dnl @synopsis AX_MAINTAINER_MODE_AUTO_SILENT
dnl
dnl Set autotools to error/sleep settings so that they are not run when
dnl being errornously triggered. Likewise make libtool-silent when
dnl libtool has been used.
dnl
dnl I am using the macro quite a lot since some automake versions had
dnl the tendency to try to rerun some autotools on a mere make even
dnl when not quite in --maintainer-mode. That is very annoying.
dnl Likewise, a user who installs from source does not want to see
dnl doubled compiler messages.
dnl
dnl I did not put an AC-REQUIRE(MAINTAINER_MODE) in here - should I?
dnl
dnl @category Misc
dnl @category Automake
dnl @author Guido Draheim <guidod@gmx.de>
dnl @version 2005-01-21
dnl @license GPLWithACException

AC_DEFUN([AX_MAINTAINER_MODE_AUTO_SILENT],[dnl
dnl ac_REQUIRE([am_MAINTAINER_MODE])dn
AC_MSG_CHECKING(auto silent in maintainer mode)
if test "$USE_MAINTAINER_MODE" = "no" ; then
   test ".$TIMEOUT" = "." && TIMEOUT="9"
   AUTOHEADER="sleep $TIMEOUT ; true || autoheader || skipped"
   AUTOMAKE="sleep $TIMEOUT ; true || automake || skipped"
   AUTOCONF="sleep $TIMEOUT ; true || autoconf || skipped"
   if test ".$LIBTOOL" != "." ; then
      LIBTOOL="$LIBTOOL --silent"
      AC_MSG_RESULT([libtool-silent, auto-sleep-9])
   else
      AC_MSG_RESULT([auto-sleep-9])
   fi
else
      AC_MSG_RESULT([no])
fi
])

dnl @synopsis AX_CHECK_COMPILER_FLAGS(FLAGS, [ACTION-SUCCESS], [ACTION-FAILURE])
dnl
dnl @summary check whether FLAGS are accepted by the compiler
dnl
dnl Check whether the given compiler FLAGS work with the current
dnl language's compiler, or whether they give an error. (Warnings,
dnl however, are ignored.)
dnl
dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
dnl success/failure.
dnl
dnl @category Misc
dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
dnl @version 2005-05-30
dnl @license GPLWithACException

AC_DEFUN([AX_CHECK_COMPILER_FLAGS],
[AC_PREREQ(2.59) dnl for _AC_LANG_PREFIX
AC_MSG_CHECKING([whether _AC_LANG compiler accepts $1])
dnl Some hackery here since AC_CACHE_VAL can't handle a non-literal varname:
AS_LITERAL_IF([$1],
  [AC_CACHE_VAL(AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1), [
      ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
      _AC_LANG_PREFIX[]FLAGS="$1"
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
        AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
      _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])],
  [ax_save_FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$1"
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], 
     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=yes,
     eval AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)=no)
   _AC_LANG_PREFIX[]FLAGS=$ax_save_FLAGS])
eval ax_check_compiler_flags=$AS_TR_SH(ax_cv_[]_AC_LANG_ABBREV[]_flags_$1)
AC_MSG_RESULT($ax_check_compiler_flags)
if test "x$ax_check_compiler_flags" = xyes; then
	m4_default([$2], :)
else
	m4_default([$3], :)
fi
])dnl AX_CHECK_COMPILER_FLAGS


##### http://autoconf-archive.cryp.to/ax_boost_base.html
#
# SYNOPSIS
#
#   AX_BOOST_BASE([MINIMUM-VERSION])
#
# DESCRIPTION
#
#   Test for the Boost C++ libraries of a particular version (or newer)
#
#   If no path to the installed boost library is given the macro
#   searchs under /usr, /usr/local, /opt and /opt/local and evaluates
#   the $BOOST_ROOT environment variable. Further documentation is
#   available at <http://randspringer.de/boost/index.html>.
#
#   This macro calls:
#
#     AC_SUBST(BOOST_CPPFLAGS) / AC_SUBST(BOOST_LDFLAGS)
#
#   And sets:
#
#     HAVE_BOOST
#
# LAST MODIFICATION
#
#   2007-07-28
#
# COPYLEFT
#
#   Copyright (c) 2007 Thomas Porschberg <thomas@randspringer.de>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([AX_BOOST_BASE],
[
AC_ARG_WITH([boost],
	AS_HELP_STRING([--with-boost@<:@=DIR@:>@], [use boost (default is yes) - it is possible to specify the root directory for boost (optional)]),
	[
    if test "$withval" = "no"; then
		want_boost="no"
    elif test "$withval" = "yes"; then
        want_boost="yes"
        ac_boost_path=""
    else
	    want_boost="yes"
        ac_boost_path="$withval"
	fi
    ],
    [want_boost="yes"])

if test "x$want_boost" = "xyes"; then
	boost_lib_version_req=ifelse([$1], ,1.20.0,$1)
	boost_lib_version_req_shorten=`expr $boost_lib_version_req : '\([[0-9]]*\.[[0-9]]*\)'`
	boost_lib_version_req_major=`expr $boost_lib_version_req : '\([[0-9]]*\)'`
	boost_lib_version_req_minor=`expr $boost_lib_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
	boost_lib_version_req_sub_minor=`expr $boost_lib_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
	if test "x$boost_lib_version_req_sub_minor" = "x" ; then
		boost_lib_version_req_sub_minor="0"
    	fi
	WANT_BOOST_VERSION=`expr $boost_lib_version_req_major \* 100000 \+  $boost_lib_version_req_minor \* 100 \+ $boost_lib_version_req_sub_minor`
	AC_MSG_CHECKING(for boostlib >= $boost_lib_version_req)
	succeeded=no

	dnl first we check the system location for boost libraries
	dnl this location ist chosen if boost libraries are installed with the --layout=system option
	dnl or if you install boost with RPM
	if test "$ac_boost_path" != ""; then
		BOOST_LDFLAGS="-L$ac_boost_path/lib"
		BOOST_CPPFLAGS="-I$ac_boost_path/include"
	else
		for ac_boost_path_tmp in /usr /usr/local /opt /opt/local ; do
			if test -d "$ac_boost_path_tmp/include/boost" && test -r "$ac_boost_path_tmp/include/boost"; then
				BOOST_LDFLAGS="-L$ac_boost_path_tmp/lib"
				BOOST_CPPFLAGS="-I$ac_boost_path_tmp/include"
				break;
			fi
		done
	fi

	CPPFLAGS_SAVED="$CPPFLAGS"
	CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
	export CPPFLAGS

	LDFLAGS_SAVED="$LDFLAGS"
	LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
	export LDFLAGS

	AC_LANG_PUSH(C++)
     	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	@%:@include <boost/version.hpp>
	]], [[
	#if BOOST_VERSION >= $WANT_BOOST_VERSION
	// Everything is okay
	#else
	#  error Boost version is too old
	#endif
	]])],[
        AC_MSG_RESULT(yes)
	succeeded=yes
	found_system=yes
       	],[
       	])
	AC_LANG_POP([C++])



	dnl if we found no boost with system layout we search for boost libraries
	dnl built and installed without the --layout=system option or for a staged(not installed) version
	if test "x$succeeded" != "xyes"; then
		_version=0
		if test "$ac_boost_path" != ""; then
               		BOOST_LDFLAGS="-L$ac_boost_path/lib"
			if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
				for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
					_version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
					V_CHECK=`expr $_version_tmp \> $_version`
					if test "$V_CHECK" = "1" ; then
						_version=$_version_tmp
					fi
					VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
					BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
				done
			fi
		else
			for ac_boost_path in /usr /usr/local /opt /opt/local ; do
				if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
					for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
						_version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
						V_CHECK=`expr $_version_tmp \> $_version`
						if test "$V_CHECK" = "1" ; then
							_version=$_version_tmp
	               					best_path=$ac_boost_path
						fi
					done
				fi
			done

			VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
			BOOST_CPPFLAGS="-I$best_path/include/boost-$VERSION_UNDERSCORE"
			BOOST_LDFLAGS="-L$best_path/lib"

	    		if test "x$BOOST_ROOT" != "x"; then
				if test -d "$BOOST_ROOT" && test -r "$BOOST_ROOT" && test -d "$BOOST_ROOT/stage/lib" && test -r "$BOOST_ROOT/stage/lib"; then
					version_dir=`expr //$BOOST_ROOT : '.*/\(.*\)'`
					stage_version=`echo $version_dir | sed 's/boost_//' | sed 's/_/./g'`
			        	stage_version_shorten=`expr $stage_version : '\([[0-9]]*\.[[0-9]]*\)'`
					V_CHECK=`expr $stage_version_shorten \>\= $_version`
				        if test "$V_CHECK" = "1" ; then
						AC_MSG_NOTICE(We will use a staged boost library from $BOOST_ROOT)
						BOOST_CPPFLAGS="-I$BOOST_ROOT"
						BOOST_LDFLAGS="-L$BOOST_ROOT/stage/lib"
					fi
				fi
	    		fi
		fi

		CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
		export CPPFLAGS
		LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
		export LDFLAGS

		AC_LANG_PUSH(C++)
	     	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
		@%:@include <boost/version.hpp>
		]], [[
		#if BOOST_VERSION >= $WANT_BOOST_VERSION
		// Everything is okay
		#else
		#  error Boost version is too old
		#endif
		]])],[
        	AC_MSG_RESULT(yes)
		succeeded=yes
		found_system=yes
       		],[
	       	])
		AC_LANG_POP([C++])
	fi

	if test "$succeeded" != "yes" ; then
		AC_MSG_NOTICE([[Boost not found]])
	else
		AC_SUBST(BOOST_CPPFLAGS)
		AC_SUBST(BOOST_LDFLAGS)
		AC_DEFINE(HAVE_BOOST,,[define if the Boost library is available])
		have_boost="yes"
	fi

        CPPFLAGS="$CPPFLAGS_SAVED"
       	LDFLAGS="$LDFLAGS_SAVED"
fi

])

# Configure paths for LIBXML2
# Mike Hommey 2004-06-19
# use CPPFLAGS instead of CFLAGS
# Toshio Kuratomi 2001-04-21
# Adapted from:
# Configure paths for GLIB
# Owen Taylor     97-11-3

dnl AM_PATH_XML2([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for XML, and define XML_CPPFLAGS and XML_LIBS
dnl
AC_DEFUN([AM_PATH_XML2],[ 
AC_ARG_WITH(xml-prefix,
            [  --with-xml-prefix=PFX   Prefix where libxml is installed (optional)],
            xml_config_prefix="$withval", xml_config_prefix="")
AC_ARG_WITH(xml-exec-prefix,
            [  --with-xml-exec-prefix=PFX Exec prefix where libxml is installed (optional)],
            xml_config_exec_prefix="$withval", xml_config_exec_prefix="")
AC_ARG_ENABLE(xmltest,
              [  --disable-xmltest       Do not try to compile and run a test LIBXML program],,
              enable_xmltest=yes)

  if test x$xml_config_exec_prefix != x ; then
     xml_config_args="$xml_config_args"
     if test x${XML2_CONFIG+set} != xset ; then
        XML2_CONFIG=$xml_config_exec_prefix/bin/xml2-config
     fi
  fi
  if test x$xml_config_prefix != x ; then
     xml_config_args="$xml_config_args --prefix=$xml_config_prefix"
     if test x${XML2_CONFIG+set} != xset ; then
        XML2_CONFIG=$xml_config_prefix/bin/xml2-config
     fi
  fi

  AC_PATH_PROG(XML2_CONFIG, xml2-config, no)
  min_xml_version=ifelse([$1], ,2.0.0,[$1])
  AC_MSG_CHECKING(for libxml - version >= $min_xml_version)
  no_xml=""
  if test "$XML2_CONFIG" = "no" ; then
    no_xml=yes
  else
    XML_CPPFLAGS=`$XML2_CONFIG $xml_config_args --cflags`
    XML_LIBS=`$XML2_CONFIG $xml_config_args --libs`
    xml_config_major_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    xml_config_minor_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    xml_config_micro_version=`$XML2_CONFIG $xml_config_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    if test "x$enable_xmltest" = "xyes" ; then
      ac_save_CPPFLAGS="$CPPFLAGS"
      ac_save_LIBS="$LIBS"
      CPPFLAGS="$CPPFLAGS $XML_CPPFLAGS"
      LIBS="$XML_LIBS $LIBS"
dnl
dnl Now check if the installed libxml is sufficiently new.
dnl (Also sanity checks the results of xml2-config to some extent)
dnl
      rm -f conf.xmltest
      AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libxml/xmlversion.h>

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

  system("touch conf.xmltest");

  /* Capture xml2-config output via autoconf/configure variables */
  /* HP/UX 9 (%@#!) writes to sscanf strings */
  tmp_version = (char *)strdup("$min_xml_version");
  if (sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
     printf("%s, bad version string from xml2-config\n", "$min_xml_version");
     exit(1);
   }
   free(tmp_version);

   /* Capture the version information from the header files */
   tmp_version = (char *)strdup(LIBXML_DOTTED_VERSION);
   if (sscanf(tmp_version, "%d.%d.%d", &xml_major_version, &xml_minor_version, &xml_micro_version) != 3) {
     printf("%s, bad version string from libxml includes\n", "LIBXML_DOTTED_VERSION");
     exit(1);
   }
   free(tmp_version);

 /* Compare xml2-config output to the libxml headers */
  if ((xml_major_version != $xml_config_major_version) ||
      (xml_minor_version != $xml_config_minor_version) ||
      (xml_micro_version != $xml_config_micro_version))
    {
      printf("*** libxml header files (version %d.%d.%d) do not match\n",
         xml_major_version, xml_minor_version, xml_micro_version);
      printf("*** xml2-config (version %d.%d.%d)\n",
         $xml_config_major_version, $xml_config_minor_version, $xml_config_micro_version);
      return 1;
    } 
/* Compare the headers to the library to make sure we match */
  /* Less than ideal -- doesn't provide us with return value feedback, 
   * only exits if there's a serious mismatch between header and library.
   */
    LIBXML_TEST_VERSION;

    /* Test that the library is greater than our minimum version */
    if ((xml_major_version > major) ||
        ((xml_major_version == major) && (xml_minor_version > minor)) ||
        ((xml_major_version == major) && (xml_minor_version == minor) &&
        (xml_micro_version >= micro)))
      {
        return 0;
       }
     else
      {
        printf("\n*** An old version of libxml (%d.%d.%d) was found.\n",
               xml_major_version, xml_minor_version, xml_micro_version);
        printf("*** You need a version of libxml newer than %d.%d.%d. The latest version of\n",
           major, minor, micro);
        printf("*** libxml is always available from ftp://ftp.xmlsoft.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 xml2-config shell script is\n");
        printf("*** being found. The easiest way to fix this is to remove the old version\n");
        printf("*** of LIBXML, but you can also set the XML2_CONFIG environment to point to the\n");
        printf("*** correct copy of xml2-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_xml=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CPPFLAGS="$ac_save_CPPFLAGS"
       LIBS="$ac_save_LIBS"
     fi
  fi

  if test "x$no_xml" = x ; then
     AC_MSG_RESULT(yes (version $xml_config_major_version.$xml_config_minor_version.$xml_config_micro_version))
     ifelse([$2], , :, [$2])     
  else
     AC_MSG_RESULT(no)
     if test "$XML2_CONFIG" = "no" ; then
       echo "*** The xml2-config script installed by LIBXML could not be found"
       echo "*** If libxml was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the XML2_CONFIG environment variable to the"
       echo "*** full path to xml2-config."
     else
       if test -f conf.xmltest ; then
        :
       else
          echo "*** Could not run libxml test program, checking why..."
          CPPFLAGS="$CPPFLAGS $XML_CPPFLAGS"
          LIBS="$LIBS $XML_LIBS"
          AC_TRY_LINK([
#include <libxml/xmlversion.h>
#include <stdio.h>
],      [ LIBXML_TEST_VERSION; return 0;],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding LIBXML or finding the wrong"
          echo "*** version of LIBXML. If it is not finding LIBXML, 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 "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means LIBXML was incorrectly installed"
          echo "*** or that you have moved LIBXML since it was installed. In the latter case, you"
          echo "*** may want to edit the xml2-config script: $XML2_CONFIG" ])
          CPPFLAGS="$ac_save_CPPFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi

     XML_CPPFLAGS=""
     XML_LIBS=""
     ifelse([$3], , :, [$3])
  fi
  AC_SUBST(XML_CPPFLAGS)
  AC_SUBST(XML_LIBS)
  rm -f conf.xmltest
])