Index: draw.h
===================================================================
--- draw.h	(revision 20464)
+++ draw.h	(revision 20465)
@@ -62,7 +62,7 @@
 			int is_current;
 			pcb_pstk_draw_hole_t holetype;
 			pcb_layer_combining_t comb;
-			pcb_layer_t *layer1; /* first (real) layer in the target group */
+			const pcb_layer_t *layer1; /* first (real) layer in the target group */
 
 			pcb_layer_type_t shape_mask; /* when gid is invalid, use this for the shapes */
 		} pstk;