Index: trunk/src/obj_subc.c
===================================================================
--- trunk/src/obj_subc.c	(revision 31844)
+++ trunk/src/obj_subc.c	(revision 31845)
@@ -859,7 +859,7 @@
 		dst->ID = src->ID; \
 } while(0)
 
-pcb_subc_t *pcb_subc_copy_meta(pcb_subc_t *dst, pcb_subc_t *src)
+pcb_subc_t *pcb_subc_copy_meta(pcb_subc_t *dst, const pcb_subc_t *src)
 {
 	if (dst == NULL)
 		return NULL;
@@ -868,7 +868,7 @@
 }
 
 
-pcb_subc_t *pcb_subc_dup_at(pcb_board_t *pcb, pcb_data_t *dst, pcb_subc_t *src, rnd_coord_t dx, rnd_coord_t dy, rnd_bool keep_ids)
+pcb_subc_t *pcb_subc_dup_at(pcb_board_t *pcb, pcb_data_t *dst, const pcb_subc_t *src, rnd_coord_t dx, rnd_coord_t dy, rnd_bool keep_ids)
 {
 	pcb_board_t *src_pcb;
 	int n;
Index: trunk/src/obj_subc.h
===================================================================
--- trunk/src/obj_subc.h	(revision 31844)
+++ trunk/src/obj_subc.h	(revision 31845)
@@ -191,9 +191,9 @@
 
 
 /* Copy non-layer, non-geometrical metadata (e.g. attributes) */
-pcb_subc_t *pcb_subc_copy_meta(pcb_subc_t *dst, pcb_subc_t *src);
+pcb_subc_t *pcb_subc_copy_meta(pcb_subc_t *dst, const pcb_subc_t *src);
 
-pcb_subc_t *pcb_subc_dup_at(pcb_board_t *pcb, pcb_data_t *dst, pcb_subc_t *src, rnd_coord_t dx, rnd_coord_t dy, rnd_bool keep_ids);
+pcb_subc_t *pcb_subc_dup_at(pcb_board_t *pcb, pcb_data_t *dst, const pcb_subc_t *src, rnd_coord_t dx, rnd_coord_t dy, rnd_bool keep_ids);
 
 /* Replace dst with a copy of src in place (preserving location and orientation
    and attributes. If add_undo is true, add the old subc del and the new subc