patch 7.4.1402
Problem: GTK 3 is not supported.
Solution: Add GTK 3 support. (Kazunobu Kuriyama)
diff --git a/src/structs.h b/src/structs.h
index c47eef3..95b33c3 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2736,7 +2736,9 @@
#ifdef FEAT_GUI_GTK
GtkWidget *id; /* Manage this to enable item */
GtkWidget *submenu_id; /* If this is submenu, add children here */
+# if defined(GTK_CHECK_VERSION) && !GTK_CHECK_VERSION(3,4,0)
GtkWidget *tearoff_handle;
+# endif
GtkWidget *label; /* Used by "set wak=" code. */
#endif
#ifdef FEAT_GUI_MOTIF