--- Makefile.orig	2008-06-17 21:47:28.000000000 +0200
+++ Makefile	2008-06-17 21:47:37.000000000 +0200
@@ -1,6 +1,6 @@
 # GNU Makefile
 
-CFLAGS = -O3 -Wextra -Wall
+CFLAGS += -Wextra -Wall
 CFILES = SearchGame.c TransGame.c Game.c
 JAVAFILES = SearchGame.java Connect4.java Game.java TransGame.java
 HASKELLFILES = Main.hs Connect4.hs GameTreeSearch.hs