-int print_rgb_colour(drawing *dr, int hatch, float r, float g, float b)
+int print_grey_colour(drawing *dr, float grey) { return 0; }
+int print_hatched_colour(drawing *dr, int hatch) { return 0; }
+int print_rgb_mono_colour(drawing *dr, float r, float g, float b, int grey)
+{ return 0; }
+int print_rgb_grey_colour(drawing *dr, float r, float g, float b, float grey)
+{ return 0; }
+int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch)