--- a/ui/gtk/toolkit.h	Thu Nov 16 12:04:10 2017 +0100
+++ b/ui/gtk/toolkit.h	Sun Nov 19 09:00:16 2017 +0100
@@ -59,6 +59,10 @@
     void          *finish_data;
 } UiJob;
 
+struct UiSelection {
+    GtkSelectionData *data;
+};
+
 typedef enum UiOrientation UiOrientation;
 enum UiOrientation { UI_HORIZONTAL = 0, UI_VERTICAL };