Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 19735)
+++ layer_grp.h	(revision 19736)
@@ -257,6 +257,13 @@
 extern const pcb_dflgmap_t *pcb_dflgmap_last_top_noncopper;
 extern const pcb_dflgmap_t *pcb_dflgmap_first_bottom_noncopper;
 
+/* predefined common default map entries for building a stack */
+const pcb_dflgmap_t pcb_dflg_top_copper;
+const pcb_dflgmap_t pcb_dflg_int_copper;
+const pcb_dflgmap_t pcb_dflg_substrate;
+const pcb_dflgmap_t pcb_dflg_bot_copper;
+
+
 /* Overwrite an existing group from a default layer group map entry and create
    a layer in the group */
 void pcb_layergrp_set_dflgly(pcb_board_t *pcb, pcb_layergrp_t *grp, const pcb_dflgmap_t *src);