dnl @synopsis IMMDX_LIB_METIS([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
dnl
dnl This macro searches for the METIS library in the user specified
dnl location. The user may specify the location either by defining the
dnl environment variable METIS or by using the --with-metis option to
dnl configure. If the environment variable is defined it has precedent
dnl over everything else. If no location was specified then it searches
dnl in /usr/lib and /usr/local/lib for the library and in /usr/include
dnl and /usr/local/include for the header files. Upon sucessful
dnl completion the variables METIS_LIB and METIS_INCLUDE are set.
dnl
dnl ACTION-IF-FOUND is a list of shell commands to run if a METIS
dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
dnl default action will define HAVE_METIS. If ACTION-IF-NOT-FOUND is
dnl not specified then an error will be generated halting configure.
dnl
dnl @category InstalledPackages
dnl @author Ben Bergen <ben@cs.fau.de>
dnl @version 2003-01-19
dnl @license AllPermissive

AC_DEFUN([IMMDX_LIB_METIS], [
	AC_MSG_CHECKING(for METIS library)
	AC_REQUIRE([AC_PROG_CC])
	#
	# User hints...
	#
	AC_ARG_VAR([METIS], [METIS library location])
	AC_ARG_WITH([metis],
		[AC_HELP_STRING([--with-metis],
		[user defined path to METIS library])],
		[
			if test -n "$METIS" ; then
				AC_MSG_RESULT(yes)
				with_metis=$METIS
			elif test "$withval" != no ; then
				AC_MSG_RESULT(yes)
				with_metis=$withval
			else
				AC_MSG_RESULT(no)
			fi
		],
		[
			if test -n "$METIS" ; then
				with_metis=$METIS
				AC_MSG_RESULT(yes)
			else
				with_metis=/usr
				if test ! -f "$with_metis/include/metis.h" ; then
					with_metis=/usr/local
					if test ! -f "$with_metis/include/metis.h" ; then
						with_metis=""
						AC_MSG_RESULT(failed)
					else
						AC_MSG_RESULT(yes)
					fi
				else
					AC_MSG_RESULT(yes)
				fi
			fi
		])
	#
	# locate METIS library
	#
		if test -n "$with_metis" ; then
			old_CFLAGS=$CFLAGS
			old_LDFLAGS=$LDFLAGS
			CFLAGS="-I$with_metis/include"
			LDFLAGS="-L$with_metis/lib"

			AC_LANG_SAVE
			AC_LANG_C

			AC_CHECK_LIB(metis, METIS_PartMeshDual,
				[metis_lib=yes], [metis_lib=yes], [-lm])
			AC_CHECK_HEADER(metis.h, [metis_h=yes],
				[metis_h=no], [/* check */])

			AC_LANG_RESTORE

			CFLAGS=$old_CFLAGS
			LDFLAGS=$old_LDFLAGS

			AC_MSG_CHECKING(METIS in $with_metis)
			if test "$metis_lib" = "yes" -a "$metis_h" = "yes" ; then
				AC_SUBST(METIS_INCLUDE, [-I$with_metis/include])
				AC_SUBST(METIS_LIB, [-L$with_metis/lib])
				AC_MSG_RESULT(ok)
			else
				AC_MSG_RESULT(failed)
			fi
		fi
		#
		#
		#
		if test x = x"$METIS_LIB" ; then
			ifelse([$2],,[AC_MSG_ERROR(Failed to find valid METIS library)],[$2])
			:
		else
			ifelse([$1],,[AC_DEFINE(HAVE_METIS,1,[Define if you have METIS library])],[$1])
			:
		fi
	])dnl IMMDX_LIB_METIS