-#define wxHelpController wxWinHelpController
-#define sm_classwxHelpController sm_classwxWinHelpController
-#else
-#define wxHelpController wxExtHelpController
-#define sm_classwxHelpController sm_classwxExtHelpController
-#endif
+ #include "wx/msw/helpwin.h"
+
+ #define wxHelpController wxWinHelpController
+ #define sm_classwxHelpController sm_classwxWinHelpController
+#else // !MSW
+ #include "wx/helpbase.h"
+#endif // MSW/!MSW