diff --git a/configure.in b/configure.in
index 00775fc51cf..7f2a809de7a 100644
--- a/configure.in
+++ b/configure.in
@@ -2467,6 +2467,8 @@ AC_SUBST(ns_appbindir)
 AC_SUBST(ns_appresdir)
 AC_SUBST(ns_appsrc)
 AC_SUBST(GNUSTEP_MAKEFILES)
+AC_SUBST(GNUSTEP_SYSTEM_HEADERS)
+AC_SUBST(GNUSTEP_SYSTEM_LIBRARIES)
 AC_SUBST(GNU_OBJC_CFLAGS)
 AC_SUBST(LIB_SRC_EXTRA_INSTALLABLES)