Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 19745)
+++ layer_grp.h	(revision 19746)
@@ -247,6 +247,7 @@
 typedef struct pcb_dflgmap_s {
 	const char *name;
 	pcb_layer_type_t lyt;
+	const char *purpose;
 	pcb_layer_combining_t comb;
 	int force_end;
 } pcb_dflgmap_t;