Index: layer_grp.h
===================================================================
--- layer_grp.h	(revision 7737)
+++ layer_grp.h	(revision 7738)
@@ -65,7 +65,7 @@
 pcb_layergrp_id_t pcb_layer_move_to_group(pcb_board_t *pcb, pcb_layer_id_t layer, pcb_layergrp_id_t group);
 
 /* Returns pcb_true if all layers in a group are empty */
-pcb_bool pcb_is_layergrp_empty(pcb_layergrp_id_t lgrp);
+pcb_bool pcb_is_layergrp_empty(pcb_board_t *pcb, pcb_layergrp_id_t lgrp);
 
 /* call the gui to set a layer group */
 int pcb_layer_gui_set_glayer(pcb_layergrp_id_t grp, int is_empty);