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