Index: obj_pstk.h
===================================================================
--- obj_pstk.h	(revision 14728)
+++ obj_pstk.h	(revision 14729)
@@ -86,6 +86,10 @@
 void pcb_pstk_bbox(pcb_pstk_t *ps);
 void pcb_pstk_copper_bbox(pcb_box_t *dst, pcb_pstk_t *ps);
 
+/* hash */
+unsigned int pcb_pstk_hash(const pcb_host_trans_t *tr, const pcb_pstk_t *p);
+
+
 void pcb_pstk_set_thermal(pcb_pstk_t *ps, unsigned long lid, unsigned char shape);
 unsigned char *pcb_pstk_get_thermal(pcb_pstk_t *ps, unsigned long lid, pcb_bool_t alloc);