dnl test for libt2n and libt2n-codegen
dnl LIBT2N(VERSION, action-if, action-not)
AC_DEFUN([LIBT2N_CHECK],
[
	PKG_CHECK_MODULES(LIBT2N, [$1], [$2], [$3])
	LIBT2N_CODEGEN=`$PKG_CONFIG --variable libt2n_codegen libt2n`
	LIBT2N_DATADIR=`$PKG_CONFIG --variable libt2n_datadir libt2n`
	LIBT2N_CLIENT_PCTEMPLATE="$LIBT2N_DATADIR/clientlib.pc.in"
	AC_SUBST(LIBT2N_CODEGEN)
	AC_SUBST(LIBT2N_CLIENT_PCTEMPLATE)

	dnl newer automake versions do not allow to use += on undefined variables
	dnl but we want to use += in codegen.make (s.a. examples-codegen/example1)
	dnl as workaround we always define them
	dnl see also:
	dnl automake ml: subject: "automake conditional append"
	dnl http://sourceware.org/ml/automake/2005-01/msg00019.html
	dnl
	dnl Note:
	dnl if you update from libt2n 0.1 to 0.2 
	dnl you must take care to pick up the right libt2n.m4

	AC_SUBST([include_HEADERS], [''])
	AC_SUBST([BUILT_SOURCES], [''])
	AC_SUBST([CLEANFILES], [''])
	AC_SUBST([DISTCLEANFILES], [''])
	AC_SUBST([EXTRA_DIST], [''])
])