--- a/os.c	Sat May 06 13:24:06 2006 +0200
+++ b/os.c	Sat May 06 15:42:06 2006 +0200
@@ -129,12 +129,12 @@
 
 }
 
-void PrintMove(struct BoxMove b)
+void PrintMove(const struct BoxMove b)
 {
 	printf("Box: %i, Direction: {%i,%i}\n", b.box, b.dir.x, b.dir.y);
 }
 
-static void show_percent_callback(int parameter)
+static void show_percent_callback(const int parameter)
 {
 	fprintf(stderr, "Percent: %2.12f, depth: %i-%i\n", percent_to_show,
 		min_depth_period, max_depth_period);