ac_caolan_check_package

Provides --with-PACKAGE, --with-PACKAGE-include and --with-PACKAGE-libdir options to configure. Supports the now standard --with-PACKAGE=DIR approach where the package's include dir and lib dir are underneath DIR, but also allows the include and lib directories to be specified seperately

adds the extra -Ipath to CFLAGS if needed adds extra -Lpath to LD_FLAGS if needed searches for the FUNCTION in the LIBRARY with AC_CHECK_LIBRARY and thus adds the lib to LIBS

defines HAVE_PKG_PACKAGE if it is found, (where PACKAGE in the HAVE_PKG_PACKAGE is replaced with the actual first parameter passed) note that autoheader will complain of not having the HAVE_PKG_PACKAGE and you will have to add it to acconfig.h manually

with fixes from... Alexandre Duret-Lutz <duret_g@lrde.epita.fr> Matthew Mueller <donut@azstarnet.com>

AC_DEFUN(AC_caolan_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],
$1_include="$withval")

AC_ARG_WITH($1-libdir,
[  --with-$1-libdir=DIR        specify exact library dir for $1 library
  --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

	no_good=no
	AC_CHECK_LIB($3,$2,,no_good=yes)
	AC_CHECK_HEADER($4,,no_good=yes)
	if test "$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

])