// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c) Julian Smart
-// Licence: wxWindows license
+// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#include "wx/wx.h"
#endif
+#if !wxUSE_SASH
+ #error "Thisfile requires wxUSE_SASH to be defined."
+#endif // wxUSE_SASH
+
#include <math.h>
#include <stdlib.h>