--- Makefile	2009-03-12 15:54:23.000000000 -0300
+++ Makefile.orig	2009-03-12 15:54:35.000000000 -0300
@@ -38,7 +38,6 @@
 	@rm -f a.out
 
 $(BIN)/driver: a.out
-	-mv $(BIN)/driver $(BIN)/driver.old
 	cp a.out $(BIN)/driver
 
 install: $(BIN)/driver