--- OLD/ppm/ppmdither.c	Thu Jan  1 00:00:00 1970
+++ NEW/ppm/ppmdither.c	Thu Jan  1 00:00:00 1970
@@ -156,9 +156,7 @@
 /* dith_color():
  *  Return the closest color index for the one we ask
  */
-int
-dith_color(r, g, b)
-float r, g, b;
+int dith_color(float r, float g, float b)
 {
     int rr, gg, bb;