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/usr/share/aclocal/vdk-2.m4 is in libvdk2-dev 2.4.0-5.3.

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The actual contents of the file can be viewed below.

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# Configure paths for VDK
# Mario Motta 11-19-2000
# stolen from Frank Belew
# stolen from Manish Singh
# Shamelessly stolen from Owen Taylor

AC_DEFUN([AM_PATH_VDK_2],
[## 
## Get the cflags and libraries from the vdk-config script
##
AC_ARG_WITH(vdk-prefix,[  --with-vdk-prefix=PFX   Prefix where VDK is installed (optional)],
            vdk_prefix="$withval", vdk_prefix="")
AC_ARG_WITH(vdk-exec-prefix,[  --with-vdk-exec-prefix=PFX Exec prefix where VDK is installed (optional)],
            vdk_exec_prefix="$withval", vdk_exec_prefix="")
AC_ARG_ENABLE(vdktest, [  --disable-vdktest       Do not try to compile and run a test VDK program],
		    , enable_vdktest=yes)

  if test x$vdk_exec_prefix != x ; then
     vdk_args="$vdk_args --exec-prefix=$vdk_exec_prefix"
     if test x${VDK_CONFIG+set} != xset ; then
        VDK_CONFIG=$vdk_exec_prefix/bin/vdk-config-2
     fi
  fi
  if test x$vdk_prefix != x ; then
     vdk_args="$vdk_args --prefix=$vdk_prefix"
     if test x${VDK_CONFIG+set} != xset ; then
        VDK_CONFIG=$vdk_prefix/bin/vdk-config-2
     fi
  fi

  AC_PATH_PROG(VDK_CONFIG, vdk-config-2, no)
  min_vdk_version=ifelse([$1], ,2.4.0,$1)
  AC_MSG_CHECKING(for VDK - version >= $min_vdk_version)
  no_vdk=""
  if test "$VDK_CONFIG" = "no" ; then
    no_vdk=yes
  else
    AC_LANG_SAVE
    AC_LANG_CPLUSPLUS
  
    VDK_CFLAGS=`$VDK_CONFIG $vdkconf_args --cflags`
    VDK_LIBS=`$VDK_CONFIG $vdkconf_args --libs`

    vdk_major_version=`$VDK_CONFIG $vdk_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
    vdk_minor_version=`$VDK_CONFIG $vdk_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
    vdk_micro_version=`$VDK_CONFIG $vdk_args --version | \
           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
    if test "x$enable_vdktest" = "xyes" ; then
      ac_save_CXXFLAGS="$CXXFLAGS"
      ac_save_LIBS="$LIBS"
      CXXFLAGS="$CXXFLAGS $VDK_CFLAGS"
      LIBS="$LIBS $VDK_LIBS"
##
## Now check if the installed VDK is sufficiently new. (Also sanity
## checks the results of vdk-config to some extent
##
      rm -f conf.vdktest
      AC_TRY_RUN([
#include <stdio.h>
// #include <stdlib.h>
#include <vdk/vdkfeatures.h>
extern "C" int system(const char *s);
int main ()
{
  system ("touch conf.vdktest");

    if (($vdk_major_version > VDK_VERSION_MAJOR) ||
        (($vdk_major_version == VDK_VERSION_MAJOR) && ($vdk_minor_version > VDK_VERSION_MINOR)) ||
	(($vdk_major_version == VDK_VERSION_MAJOR) && ($vdk_minor_version == VDK_VERSION_MINOR) &&
	($vdk_micro_version >= VDK_VERSION_MICRO)))
    {
      return 0;
    }
  else
    {
      printf("\n*** 'vdk-config-2 --version' returned %d.%d, but the minimum version\n", $vdk_major_version, $vdk_minor_version);
      printf("*** of VDK required is %d.%d. If vdk-config is correct, then it is\n", VDK_VERSION_MAJOR, VDK_VERSION_MINOR);
      printf("*** best to upgrade to the required version.\n");
      printf("*** If vdk-config was wrong, set the environment variable VDK_CONFIG\n");
      printf("*** to point to the correct copy of vdk-config, and remove the file\n");
      printf("*** config.cache before re-running configure\n");
      return 1;
    }
}

],, no_vdk=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CXXFLAGS="$ac_save_CXXFLAGS"
       LIBS="$ac_save_LIBS"
     fi
  fi
  if test "x$no_vdk" = x ; then
     AC_MSG_RESULT(yes)
     ifelse([$2], , :, [$2])     
  else
     AC_MSG_RESULT(no)
     if test "$VDK_CONFIG" = "no" ; then
       echo "*** The vdk-config-2 script installed by VDK could not be found"
       echo "*** If VDK was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the VDK_CONFIG environment variable to the"
       echo "*** full path to vdk-config."
     else
       if test -f conf.vdktest ; then
        :
       else
          echo "*** Could not run VDK test program, checking why..."
          CXXFLAGS="$CXXFLAGS $VDK_CFLAGS"
          LIBS="$LIBS $VDK_LIBS"
          AC_TRY_LINK([
#include <stdio.h>
#include <vdk/vdk.h>
],      [ return 0; ],
        [ echo "*** The test program compiled, but did not run. This usually means"
          echo "*** that the run-time linker is not finding VDK or finding the wrong"
          echo "*** version of VDK. If it is not finding VDK, 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 VDK was incorrectly installed"
          echo "*** or that you have moved VDK since it was installed. In the latter case, you"
          echo "*** may want to edit the vdk-config script: $VDK_CONFIG" ])
          CXXFLAGS="$ac_save_CXXFLAGS"
          LIBS="$ac_save_LIBS"
       fi
     fi
     VDK_CFLAGS=""
     VDK_LIBS=""
     ifelse([$3], , :, [$3])
  fi
  VDK_VERSION_MAJOR=2
  VDK_VERSION_MINOR=4
  VDK_VERSION_MICRO=0
  AC_SUBST(VDK_VERSION_MAJOR)
  AC_SUBST(VDK_VERSION_MINOR)
  AC_SUBST(VDK_VERSION_MICRO)
  AC_SUBST(VDK_CFLAGS)
  AC_SUBST(VDK_LIBS)
  rm -f conf.vdktest
])

## FC_EXPAND_DIR(VARNAME, DIR)
## expands occurrences of ${prefix} and ${exec_prefix} in the given DIR,
## and assigns the resulting string to VARNAME
## example: FC_EXPAND_DIR(LOCALEDIR, "$datadir/locale")
## eg, then: AC_DEFINE_UNQUOTED(LOCALEDIR, "$LOCALEDIR")
## by Alexandre Oliva 
## from http://www.cygnus.com/ml/automake/1998-Aug/0040.html
## AC_DEFUN(FC_EXPAND_DIR, [
##	$1=$2
##	$1=`(
##		test "x$prefix" = xNONE && prefix="$ac_default_prefix"
##		test "x$exec_prefix" = xNONE && exec_prefix="${prefix}"
##		eval echo \""[$]$1"\"
##	)`
## ])