dnl @synopsis AC_CHECK_PACKAGE(PACKAGE, FUNCTION, LIBRARY , HEADERFILE [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
dnl
dnl Provides --with-PACKAGE, --with-PACKAGE-include and --with-PACKAGE-libdir
dnl options to configure. Supports the now standard --with-PACKAGE=DIR 
dnl approach where the package's include dir and lib dir are underneath DIR,
dnl but also allows the include and lib directories to be specified seperately
dnl
dnl adds the extra -Ipath to CFLAGS if needed 
dnl adds extra -Lpath to LD_FLAGS if needed
dnl searches for the FUNCTION in the LIBRARY with 
dnl AC_CHECK_LIBRARY and thus adds the lib to LIBS
dnl
dnl defines HAVE_PKG_PACKAGE if it is found, (where PACKAGE in the 
dnl HAVE_PKG_PACKAGE is replaced with the actual first parameter passed)
dnl note that autoheader will complain of not having the HAVE_PKG_PACKAGE and you 
dnl will have to add it to acconfig.h manually
dnl
dnl @version $Id$
dnl @author Caolan McNamara <caolan@skynet.ie>
dnl
dnl with fixes from...
dnl Alexandre Duret-Lutz <duret_g@lrde.epita.fr>

AC_DEFUN([AC_CHECK_PACKAGE],
[

AC_ARG_WITH($1,
[  --with-$1[=DIR]	root directory of $1 installation],
with_$1=$withval 
if test "${with_$1}" != yes; then
	$1_include="$withval/include" 
	$1_libdir="$withval/lib"
fi
)

AC_ARG_WITH($1-include,
[  --with-$1-include=DIR        specify exact include dir for $1 headers (e.g. $4)],
$1_include="$withval")

AC_ARG_WITH($1-libdir,
[  --with-$1-libdir=DIR        specify exact library dir for $1 library (e.g. lib$3)
  --without-$1        disables $1 usage completely], 
$1_libdir="$withval")

if test "${with_$1}" != no ; then
	OLD_LIBS=$LIBS
	OLD_LDFLAGS=$LDFLAGS
	OLD_CFLAGS=$CFLAGS
	OLD_CPPFLAGS=$CPPFLAGS

	if test "${$1_libdir}" ; then
		LDFLAGS="$LDFLAGS -L${$1_libdir}"
	fi
	if test "${$1_include}" ; then
		CPPFLAGS="$CPPFLAGS -I${$1_include}"
		CFLAGS="$CFLAGS -I${$1_include}"
	fi

	AC_CHECK_HEADER($4,,no_good=yes)
	AC_CHECK_LIB($3,$2,,no_good=yes)
	if test "$no_good" = yes; then
dnl	broken
		ifelse([$6], , , [$6])
		
		LIBS=$OLD_LIBS
		LDFLAGS=$OLD_LDFLAGS
		CPPFLAGS=$OLD_CPPFLAGS
		CFLAGS=$OLD_CFLAGS
	else
dnl	fixed
		ifelse([$5], , , [$5])

		AC_DEFINE(HAVE_PKG_$1)
	fi

fi

])
