--- Makefile.old	2009-03-10 19:33:51.000000000 +0100
+++ Makefile	2009-03-10 17:59:14.000000000 +0100
@@ -19,7 +19,7 @@
     CFLAGS   := -g
     CPPFLAGS :=
 else
-    CFLAGS   := -O2
+    CFLAGS   := -O2 -march=i686 -mtune=i686
     CPPFLAGS := -DNDEBUG
 endif