1 files changed, 1 insertions, 0 deletions
diff --git a/atari/plot.h b/atari/plot.h
index 9b7dc5f1f..7be7d6aa3 100755
--- a/atari/plot.h
+++ b/atari/plot.h
@@ -26,6 +26,7 @@ struct rect;
 
 int atari_plotter_init( char*, char * );
 int atari_plotter_finalise( void );
+void plot_set_knockout( int set );
 bool plot_get_clip(struct rect * out);
 bool plot_clip(const struct rect *clip);
 bool plot_rectangle( int x0, int y0, int x1, int y1,const plot_style_t *style );