diff --git a/client/maybe_gui.h b/client/maybe_gui.h
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+++ b/client/maybe_gui.h
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+// The contents of this file are subject to the BOINC Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License. You may obtain a copy of the License at
+// http://boinc.berkeley.edu/license_1.0.txt
+// 
+// Software distributed under the License is distributed on an "AS IS"
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+// License for the specific language governing rights and limitations
+// under the License. 
+// 
+// The Original Code is the Berkeley Open Infrastructure for Network Computing. 
+// 
+// The Initial Developer of the Original Code is the SETI@home project.
+// Portions created by the SETI@home project are Copyright (C) 2002
+// University of California at Berkeley. All Rights Reserved. 
+// 
+// Contributor(s):
+//
+
+// $Id$
+
+// maybe_gui.h - defines calls into potential GUI code.
+
+#ifndef H_MAYBE_GUI
+#define H_MAYBE_GUI
+
+#if defined(_WIN32) && !defined(WIN_CLI)
+#  define WIN_GUI 1
+#else
+#  undef WIN_GUI
+#endif
+
+#ifdef WIN_GUI
+void guiOnBenchmarksBegin();
+void guiOnBenchmarksEnd();
+#endif
+
+
+#endif