updated for version 7.0213
diff --git a/src/proto/gui_gtk_x11.pro b/src/proto/gui_gtk_x11.pro
index 30bde6a..afb384e 100644
--- a/src/proto/gui_gtk_x11.pro
+++ b/src/proto/gui_gtk_x11.pro
@@ -6,6 +6,7 @@
 void gui_mch_start_blink __ARGS((void));
 int gui_mch_init_check __ARGS((void));
 void gui_mch_show_tabline __ARGS((int showit));
+int gui_mch_showing_tabline __ARGS((void));
 void gui_mch_update_tabline __ARGS((void));
 void gui_mch_set_curtab __ARGS((int nr));
 int gui_mch_init __ARGS((void));