Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -326,10 +326,13 @@
 		AC_SUBST(FRAMEWORK_LDFLAGS_INSTALL_NAME)
 		AC_SUBST(FRAMEWORK_LIBS)
 
 		$1
 		;;
+	*)
+		$2
+		;;
 	esac
 ])
 
 AC_DEFUN([BUILDSYS_PLUGIN], [
 	AC_REQUIRE([AC_CANONICAL_HOST])
@@ -383,7 +386,10 @@
 
 		AC_SUBST(LINK_BUNDLE)
 
 		$1
 		;;
+	*)
+		$2
+		;;
 	esac
 ])