Index: obj_poly.h
===================================================================
--- obj_poly.h	(revision 5329)
+++ obj_poly.h	(revision 5330)
@@ -64,6 +64,7 @@
 void pcb_poly_rotate90(pcb_polygon_t *Polygon, pcb_coord_t X, pcb_coord_t Y, unsigned Number);
 void pcb_poly_rotate(pcb_layer_t *layer, pcb_polygon_t *poly, pcb_coord_t X, pcb_coord_t Y, double cosa, double sina);
 void pcb_poly_mirror(pcb_layer_t *layer, pcb_polygon_t *polygon);
+void pcb_poly_flip_side(pcb_layer_t *layer, pcb_polygon_t *polygon);
 
 void pcb_poly_move(pcb_polygon_t *Polygon, pcb_coord_t DX, pcb_coord_t DY);
 pcb_polygon_t *pcb_poly_copy(pcb_polygon_t *Dest, pcb_polygon_t *Src);