diff --git a/lib/pkg_pkg.cygpart b/lib/pkg_pkg.cygpart
index 64a58a9..1708b0e 100644
--- a/lib/pkg_pkg.cygpart
+++ b/lib/pkg_pkg.cygpart
@@ -167,6 +167,9 @@ __pkg_diff() {
 			;;
 	esac
 
+	if ! defined _CYGPORT_RESTRICT_autoreconf_diff_excludes_
+	then
+
 	# exclude aclocal.m4 if generated from aclocal
 	if [ -f ${S}/aclocal.m4 ]
 	then
@@ -191,6 +194,8 @@ __pkg_diff() {
 		default_excludes+=" configure";
 	fi
 
+	fi
+
 	# gtk-doc
 	if [ -f ${S}/gtk-doc.make -a "${PN}" != "gtk-doc" ]
 	then