Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 19178)
+++ layer_grp.h	(revision 19179)
@@ -91,6 +91,7 @@
 
 /* Returns pcb_true if all layers in a group are empty */
 pcb_bool pcb_layergrp_is_empty(pcb_board_t *pcb, pcb_layergrp_id_t lgrp);
+pcb_bool pcb_layergrp_is_pure_empty(pcb_board_t *pcb, pcb_layergrp_id_t num);
 
 /* call the gui to set a layer group */
 int pcb_layer_gui_set_glayer(pcb_board_t *pcb, pcb_layergrp_id_t grp, int is_empty);