patch-src_gauche_arith.h.diff

--- src/gauche/arith.h.org      2009-11-15 22:41:48.000000000 +0900
+++ src/gauche/arith.h  2009-11-15 22:41:55.000000000 +0900
@@ -64,9 +64,11 @@
 #define HI(word)           (((word) >> HALF_BITS)&LOMASK)
 
 /* Include processor-specific macros */
+#ifndef SCM_TARGET_X86_64
 #if defined(SCM_TARGET_I386)
 #include "arith_i386.h"
 #endif
+#endif
 
 /*-----------------------------------------------------------------
  * UADD(r, c, x, y)      unsigned word add with carry