--- OLD/xc/include/Xmd.h	Thu Jan  1 00:00:00 1970
+++ NEW/xc/include/Xmd.h	Thu Jan  1 00:00:00 1970
@@ -53,7 +53,7 @@
 #ifdef CRAY
 #define WORD64				/* 64-bit architecture */
 #endif
-#ifdef __alpha
+#if defined(__alpha) || defined(__amd64) || defined(__sparc64) || defined(__sparc64__)
 #define LONG64				/* 32/64-bit architecture */
 #endif
 #ifdef __sgi