gtk_box_pack_start (box, widget, TRUE, TRUE, 0);
}
+/* Starting with gcc8 the warning Wcast-function-type will
+ trigger if no intermediate (void (*)(void)) cast is done
+ for a function cast to GFunc when the number of parameters
+ is not 2. The reason is that the compiler behaviour in this
+ situation is undefined according to C standard although many
+ implementations rely on this. */
+#define GFUNC_COMPAT_CAST(x) ((GFunc) (void (*)(void)) (x))
+
+
+/* Return the width of an upper case M (in pixels) when rendered onto
+ WIDGET with its current style. */
+gdouble width_of_m (GtkWidget *widget);
+
#endif