Index: layer.h
===================================================================
--- layer.h	(revision 19138)
+++ layer.h	(revision 19139)
@@ -230,6 +230,7 @@
 /* Return the purpi of the group of a layer; if out is not NULL, also copy
    a pointer to the purpose string there (valid until a layer change) */
 int pcb_layer_purpose(pcb_board_t *pcb, pcb_layer_id_t layer_idx, const char **out);
+int pcb_layer_purpose_(pcb_layer_t *layer, const char **out);
 
 
 /* map bits of a layer type (call cb for each bit set); return number of bits