XER support

diff --git a/skeletons/ber_decoder.c b/skeletons/ber_decoder.c
index 24a47ac..cd40728 100644
--- a/skeletons/ber_decoder.c
+++ b/skeletons/ber_decoder.c
@@ -2,6 +2,7 @@
  * Copyright (c) 2003 Lev Walkin <vlm@lionet.info>. All rights reserved.
  * Redistribution and modifications are permitted subject to BSD license.
  */
+#include <asn_internal.h>
 #include <constr_TYPE.h>
 #include <assert.h>