Index: obj_line.h
===================================================================
--- obj_line.h	(revision 29715)
+++ obj_line.h	(revision 29716)
@@ -66,7 +66,7 @@
 void pcb_line_bbox(pcb_line_t *Line);
 void pcb_line_rotate90(pcb_line_t *Line, pcb_coord_t X, pcb_coord_t Y, unsigned Number);
 void pcb_line_rotate(pcb_layer_t *layer, pcb_line_t *line, pcb_coord_t X, pcb_coord_t Y, double cosa, double sina);
-void pcb_line_mirror(pcb_layer_t *layer, pcb_line_t *line, pcb_coord_t y_offs);
+void pcb_line_mirror(pcb_layer_t *layer, pcb_line_t *line, pcb_coord_t y_offs, pcb_bool undoable);
 void pcb_line_flip_side(pcb_layer_t *layer, pcb_line_t *line);
 void pcb_line_scale(pcb_line_t *line, double sx, double sy, double sth);