dnl Autoconf macros for libgnutls
dnl $id$

# Modified for LIBGNUTLS -- nmav
# Configure paths for LIBGCRYPT
# Shamelessly stolen from the one of XDELTA by Owen Taylor
# Werner Koch   99-12-09

dnl AM_PATH_LIBGNUTLS([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
dnl Test for libgnutls, and define LIBGNUTLS_CFLAGS and LIBGNUTLS_LIBS
dnl
AC_DEFUN(AM_PATH_LIBGNUTLS,
[dnl
dnl Get the cflags and libraries from the libgnutls-config script
dnl
AC_ARG_WITH(libgnutls-prefix,
          [  --with-libgnutls-prefix=PFX   Prefix where libgnutls is installed (optional)],
          libgnutls_config_prefix="$withval", libgnutls_config_prefix="")

  if test x$libgnutls_config_prefix != x ; then
     libgnutls_config_args="$libgnutls_config_args --prefix=$libgnutls_config_prefix"
     if test x${LIBGNUTLS_CONFIG+set} != xset ; then
        LIBGNUTLS_CONFIG=$libgnutls_config_prefix/bin/libgnutls-config
     fi
  fi

  AC_PATH_PROG(LIBGNUTLS_CONFIG, libgnutls-config, no)
  min_libgnutls_version=ifelse([$1], ,0.1.0,$1)
  AC_MSG_CHECKING(for libgnutls - version >= $min_libgnutls_version)
  no_libgnutls=""
  if test "$LIBGNUTLS_CONFIG" = "no" ; then
    no_libgnutls=yes
  else
    LIBGNUTLS_CFLAGS=`$LIBGNUTLS_CONFIG $libgnutls_config_args --cflags`
    LIBGNUTLS_LIBS=`$LIBGNUTLS_CONFIG $libgnutls_config_args --libs`
    libgnutls_config_version=`$LIBGNUTLS_CONFIG $libgnutls_config_args --version`


      ac_save_CFLAGS="$CFLAGS"
      ac_save_LIBS="$LIBS"
      CFLAGS="$CFLAGS $LIBGNUTLS_CFLAGS"
      LIBS="$LIBS $LIBGNUTLS_LIBS"
dnl
dnl Now check if the installed libgnutls is sufficiently new. Also sanity
dnl checks the results of libgnutls-config to some extent
dnl
      rm -f conf.libgnutlstest
      AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gnutls.h>

int
main ()
{
    system ("touch conf.libgnutlstest");

    if( strcmp( gnutls_check_version(NULL), "$libgnutls_config_version" ) )
    {
      printf("\n*** 'libgnutls-config --version' returned %s, but LIBGNUTLS (%s)\n",
             "$libgnutls_config_version", gnutls_check_version(NULL) );
      printf("*** was found! If libgnutls-config was correct, then it is best\n");
      printf("*** to remove the old version of LIBGNUTLS. 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 libgnutls-config was wrong, set the environment variable LIBGNUTLS_CONFIG\n");
      printf("*** to point to the correct copy of libgnutls-config, and remove the file config.cache\n");
      printf("*** before re-running configure\n");
    }
    else if ( strcmp(gnutls_check_version(NULL), LIBGNUTLS_VERSION ) )
    {
      printf("\n*** LIBGNUTLS header file (version %s) does not match\n", LIBGNUTLS_VERSION);
      printf("*** library (version %s)\n", gnutls_check_version(NULL) );
    }
    else
    {
      if ( gnutls_check_version( "$min_libgnutls_version" ) )
      {
        return 0;
      }
     else
      {
        printf("no\n*** An old version of LIBGNUTLS (%s) was found.\n",
                gnutls_check_version(NULL) );
        printf("*** You need a version of LIBGNUTLS newer than %s. The latest version of\n",
               "$min_libgnutls_version" );
        printf("*** LIBGNUTLS is always available from ftp://gnutls.hellug.gr/pub/gnutls.\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 libgnutls-config shell script is\n");
        printf("*** being found. The easiest way to fix this is to remove the old version\n");
        printf("*** of LIBGNUTLS, but you can also set the LIBGNUTLS_CONFIG environment to point to the\n");
        printf("*** correct copy of libgnutls-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_libgnutls=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CFLAGS="$ac_save_CFLAGS"
       LIBS="$ac_save_LIBS"
  fi

  if test "x$no_libgnutls" = x ; then
     AC_MSG_RESULT(yes)
     ifelse([$2], , :, [$2])
  else
     if test -f conf.libgnutlstest ; then
        :
     else
        AC_MSG_RESULT(no)
     fi
     if test "$LIBGNUTLS_CONFIG" = "no" ; then
       echo "*** The libgnutls-config script installed by LIBGNUTLS could not be found"
       echo "*** If LIBGNUTLS was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the LIBGNUTLS_CONFIG environment variable to the"
       echo "*** full path to libgnutls-config."
     else
       if test -f conf.libgnutlstest ; then
        :
       else
          echo "*** Could not run libgnutls test program, checking why..."
          CFLAGS="$CFLAGS $LIBGNUTLS_CFLAGS"
          LIBS="$LIBS $LIBGNUTLS_LIBS"
          AC_TRY_LINK([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gnutls.h>
],      [ return !!gnutls_check_version(NULL); ],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding LIBGNUTLS or finding the wrong"
          echo "*** version of LIBGNUTLS. If it is not finding LIBGNUTLS, 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 "*** The test program failed to compile or link. See the file config.log for the"
          echo "*** exact error that occured. This usually means LIBGNUTLS was incorrectly installed"
          echo "*** or that you have moved LIBGNUTLS since it was installed. In the latter case, you"
          echo "*** may want to edit the libgnutls-config script: $LIBGNUTLS_CONFIG" ])
          CFLAGS="$ac_save_CFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi
     LIBGNUTLS_CFLAGS=""
     LIBGNUTLS_LIBS=""
     ifelse([$3], , :, [$3])
     rm -f conf.libngnutlstest
  fi
  AC_SUBST(LIBGNUTLS_CFLAGS)
  AC_SUBST(LIBGNUTLS_LIBS)
])

dnl *-*wedit:notab*-*  Please keep this as the last line.