--- old/src/java.desktop/unix/native/libawt_xawt/awt/list.c	2020-03-02 01:42:00.108956800 -0800
+++ new/src/java.desktop/unix/native/libawt_xawt/awt/list.c	2020-03-02 01:41:59.679860300 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -63,6 +63,10 @@
 
   ----------------------------------------------------------------------- **/
 
+#ifdef HEADLESS
+    #error This file should not be included in headless library
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>