-add_label_to_grid_bag_sizer (wxGridBagSizer* s, wxWindow* p, wxString t, wxGBPosition pos, wxGBSpan span)
+#ifdef __WXOSX__
+add_label_to_grid_bag_sizer (wxGridBagSizer* s, wxWindow* p, wxString t, bool left, wxGBPosition pos, wxGBSpan span)
+#else
+add_label_to_grid_bag_sizer (wxGridBagSizer* s, wxWindow* p, wxString t, bool, wxGBPosition pos, wxGBSpan span)
+#endif