--- config/ymake.orig	2013-02-07 12:28:01.000000000 +0900
+++ config/ymake	2013-02-15 08:34:51.000000000 +0900
@@ -416,8 +416,8 @@
             breaksw
         case    i386:
         case    x86_64:
-            set model   = $mach
-            set arch    = $mach
+            set model   = x86_64
+            set arch    = x86_64
             set sysincs = Darwin_Intel
             set vendor  = Apple
             breaksw