--- old/src/java.desktop/unix/native/libawt_xawt/awt/sun_awt_X11_GtkFileDialogPeer.c	2020-03-02 01:42:09.325028700 -0800
+++ new/src/java.desktop/unix/native/libawt_xawt/awt/sun_awt_X11_GtkFileDialogPeer.c	2020-03-02 01:42:08.895932200 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 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
@@ -23,6 +23,10 @@
  * questions.
  */
 
+#ifdef HEADLESS
+    #error This file should not be included in headless library
+#endif
+
 #include <jni.h>
 #include <stdio.h>
 #include <jni_util.h>