src/java.desktop/unix/native/libawt_xawt/xawt/awt_Taskbar.c

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 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

@@ -21,10 +21,14 @@
  * 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
+
 #include <dlfcn.h>
 #include "jvm_md.h"
 #include <setjmp.h>
 #include <string.h>