bxgaillard commented on this pull request.
@@ -320,7 +324,11 @@ static void on_watch_dragged_callback(GtkWidget *wgt, GdkDragContext *context, i
gpointer userdata) { /* string that is dragged */ +#if GTK_CHECK_VERSION(3, 0, 0) + gchar *expression = (gchar*)gtk_selection_data_get_data(seldata);
I agree. Fixed.