-WXDLLEXPORT_DATA(extern const wxChar*) wxFrameNameStr;
-WXDLLEXPORT_DATA(extern const wxChar*) wxStatusLineNameStr;
-WXDLLEXPORT_DATA(extern const wxChar*) wxToolBarNameStr;
+extern WXDLLIMPEXP_DATA_CORE(const char) wxStatusLineNameStr[];
+extern WXDLLIMPEXP_DATA_CORE(const char) wxToolBarNameStr[];
+
+class WXDLLIMPEXP_FWD_CORE wxFrame;
+class WXDLLIMPEXP_FWD_CORE wxMenuBar;
+class WXDLLIMPEXP_FWD_CORE wxMenuItem;
+class WXDLLIMPEXP_FWD_CORE wxStatusBar;
+class WXDLLIMPEXP_FWD_CORE wxToolBar;
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------