--- mccp4-0.7.1.orig/ccp4_sysdep.h	2003-08-04 08:55:41.000000000 -0400
+++ mccp4-0.7.1/ccp4_sysdep.h	2007-05-02 18:56:40.000000000 -0400
@@ -199,7 +199,7 @@
 #  define NATIVEIT DFNTI_IBO
 #endif
 
-#if defined(MIPSEL) || defined(i386) || defined(i860) || defined(__ia64__)
+#if defined(MIPSEL) || defined(i386) || defined(i860) || defined(__ia64__) || defined(__x86_64__)
 #  define NATIVEIT DFNTI_IBO
 #  define NATIVEFT DFNTF_LEIEEE
 #endif