dnl Code shamelessly stolen from glib-config by Sebastian Rittau
dnl  Copyright (C) 2005 Free Software Foundation
dnl  Copying and distribution of this file, with or without modification,
dnl  are permitted in any medium without royalty provided the copyright
dnl  notice and this notice are preserved.
dnl AM_PATH_XML([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
AC_DEFUN(AM_PATH_XML,[
AC_ARG_WITH(xml-prefix,
            [  --with-xml-prefix=PFX    Prefix where libxml is installed (optional)],
            xml_config_prefix="$withval", xml_config_prefix="")
AC_ARG_ENABLE(xmltest,
              [  --disable-xmltest		Do not try to compile and run a test XML program],,
              enable_xmltest=yes)

  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=$xml_config_prefix/bin/xml2-config
    fi
    if test x${XML_CONFIG+set} != xset ; then
      XML_CONFIG=$xml_config_prefix/bin/xml-config
    fi
  fi

  AC_PATH_PROG(XML2_CONFIG, xml2-config, no)
  if test "$XML2_CONFIG" = "no" ; then
    AC_PATH_PROG(XML_CONFIG, xml-config, no)
  else
    XML_CONFIG=$XML2_CONFIG
  fi
  min_xml_version=ifelse([$1], ,2.0.0, [$1])
  AC_MSG_CHECKING(for libxml - version >= $min_xml_version)
  no_xml=""
  if test "$XML_CONFIG" = "no" ; then
    XML_CFLAGS=""
    XML_LIBS="-lxml2"

    ac_save_CFLAGS="$CFLAGS"
    ac_save_LIBS="$LIBS"
    CFLAGS="$CFLAGS $XML_CFLAGS"
    LIBS="$XML_LIBS $LIBS"
dnl
dnl Now check if the installed libxml is sufficiently new.
dnl
    rm -f conf.xmltest
    AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
#include <libxml/xmlversion.h>
#include <libxml/parser.h>

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

  system("touch conf.xmltest");

  tmp_version = xmlStrdup("$min_xml_version");
  if(sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    printf("%s, bad version string\n", "$min_xml_version");
    exit(1);
  }

  tmp_version = xmlStrdup(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\n", "$min_xml_version");
    exit(1);
  }

  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.gnome.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 xml-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 XML_CONFIG environment to point to the\n");
      printf("*** correct copy of xml-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"])

    CFLAGS="$ac_save_CFLAGS"
    LIBS="$ac_save_LIBS"
  else
    XML_CFLAGS=`$XML_CONFIG $xml_config_args --cflags`
    XML_LIBS=`$XML_CONFIG $xml_config_args --libs`
    xml_config_major_version=`$XML_CONFIG $xml_config_args --version | \
      sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    xml_config_minor_version=`$XML_CONFIG $xml_config_args --version | \
      sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    xml_config_micro_version=`$XML_CONFIG $xml_config_args --version | \
      sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`

    if test "x$enable_xmltest" = "xyes" ; then
      ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $XML_CFLAGS"
      LIBS="$XML_LIBS $LIBS"
dnl
dnl Now check if the installed libxml is sufficiently new.
dnl
      rm -f conf.xmltest
      AC_TRY_RUN([
#include <stdlib.h>
#include <stdio.h>
#include <libxml/xmlversion.h>
#include <libxml/parser.h>

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

  system("touch conf.xmltest");

  tmp_version = xmlStrdup("$min_xml_version");
  if(sscanf(tmp_version, "%d.%d.%d", &major, &minor, &micro) != 3) {
    printf("%s, bad version string\n", "$min_xml_version");
    exit(1);
  }

  tmp_version = xmlStrdup(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\n", "$min_xml_version");
    exit(1);
  }

  if((xml_major_version != $xml_config_major_version) ||
     (xml_minor_version != $xml_config_minor_version) ||
     (xml_micro_version != $xml_config_micro_version))
    {
      printf("\n*** 'xml-config --version' returned %d.%d.%d, but libxml (%d.%d.%d)\n", 
             $xml_config_major_version, $xml_config_minor_version, $xml_config_micro_version,
             xml_major_version, xml_minor_version, xml_micro_version);
      printf("*** was found! If xml-config was correct, then it is best\n");
      printf("*** to remove the old version of libxml. 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 xml-config was wrong, set the environment variable XML_CONFIG\n");
      printf("*** to point to the correct copy of xml-config, and remove the file config.cache\n");
      printf("*** before re-running configure\n");
    }
  else
    {
      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.gnome.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 xml-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 XML_CONFIG environment to point to the\n");
          printf("*** correct copy of xml-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"])

      CFLAGS="$ac_save_CFLAGS"
      LIBS="$ac_save_LIBS"
    fi
  fi

  if test "x$no_xml" = x ; then
    AC_MSG_RESULT(yes)
    ifelse([$2], , :, [$2])
  else
    AC_MSG_RESULT(no)
    if test "$XML_CONFIG" = "no" ; then
      echo "*** The xml-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 XML_CONFIG environment variable to the"
      echo "*** full path to xml-config."
    else
      if test -f conf.xmltest ; then
        :
      else
        echo "*** Could not run libxml test program, checking why..."
        CFLAGS="$CFLAGS $XML_CFLAGS"
        LIBS="$LIBS $XML_LIBS"
        dnl FIXME: AC_TRY_LINK
      fi
    fi

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