--- old/src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c	2020-03-02 01:41:50.753845100 -0800
+++ new/src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c	2020-03-02 01:41:50.329749900 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 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
@@ -22,6 +22,11 @@
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
+
+#ifdef HEADLESS
+    #error This file should not be included in headless library
+#endif
+
 #include <dlfcn.h>
 #include <setjmp.h>
 #include <X11/Xlib.h>