https://bugs.gentoo.org/882241
Add missing declaration to header
--- a/src/rezlooks_draw.h
+++ b/src/rezlooks_draw.h
@@ -149,5 +149,9 @@
                                        const ResizeGripParameters      *grip,
                                        int x, int y, int width, int height);
 
+void rezlooks_draw_menubar_button   (cairo_t *cr,
+                                       const RezlooksColors         *colors,
+                                       const WidgetParameters       *params,
+                                       int x, int y, int width, int height);
 
 #endif /* REZLOOKS_DRAW_H */