diff -aurpN gtkam-0.1.18-old/configure.ac gtkam-0.1.18/configure.ac
--- gtkam-0.1.18-old/configure.ac       2011-12-29 00:04:37.298593338 +0100
+++ gtkam-0.1.18/configure.ac   2011-12-29 00:05:11.678595916 +0100
@@ -86,9 +86,7 @@ AC_CHECK_FUNC(gp_port_info_get_name,
 )
 LIBS="$save_LIBS"
 
-PKG_CHECK_MODULES([GTK], [gtk+-2.0])
-AC_SUBST([GTK_CFLAGS])
-AC_SUBST([GTK_LIBS])
+GP_CHECK_LIBRARY([GTK], [gtk+-2.0])