// currently wxAboutBox is implemented natively only under these platforms, for
// the others we provide a generic fallback here
-#if !defined(__WXMSW__) && !defined(__WXMAC__) && !defined(__WXGTK26__)
+#if !defined(__WXMSW__) && !defined(__WXMAC__) && \
+ (!defined(__WXGTK20__) || defined(__WXUNIVERSAL__))
void wxAboutBox(const wxAboutDialogInfo& info, wxWindow* parent)
{