+/*
+ * We need to set the _NET_SYSTEM_TRAY_COLORS atom on the tray selection window
+ * to make GTK+ 3 applets with symbolic icons visible. If the colors are unset,
+ * they assume a light background.
+ * See also https://bugzilla.gnome.org/show_bug.cgi?id=679591
+ *
+ */
+void init_tray_colors(void);
+