+class WXDLLEXPORT wxImage;
+class WXDLLEXPORT wxMask;
+class WXDLLEXPORT wxPalette;
+
+#if defined(__WXMGL__) || defined(__WXMAC__) || defined(__WXCOCOA__) || defined(__WXMOTIF__) || defined(__WXX11__)
+// Only used by some ports
+// FIXME -- make all ports (but MSW which uses wxGDIImage) use these base classes