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src/java.desktop/unix/native/libawt_xawt/awt/gtk_interface.h

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2005, 2016, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -20,10 +20,15 @@
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * 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
+
 #ifndef _GTK_INTERFACE_H
 #define _GTK_INTERFACE_H
 
 #include <X11/X.h>
 #include <jni.h>
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