diff -Naur ATLAS.old/include/atlas_prefetch.h ATLAS/include/atlas_prefetch.h
--- ATLAS.old/include/atlas_prefetch.h	2007-03-25 09:56:56.000000000 -0400
+++ ATLAS/include/atlas_prefetch.h	2007-03-28 18:05:01.000000000 -0400
@@ -128,7 +128,7 @@
       #define ATL_pfl1W(mem) ATL_pfavW(mem, 33619968, 2)
       #define ATL_GOT_L1PREFETCH
    #endif
-#elif defined(defined(__GNUC__))  /* last ditch, use gcc predefined func */
+#elif defined(__GNUC__)  /* last ditch, use gcc predefined func */
    #define ATL_pfl1R(mem) __builtin_prefetch(mem, 0, 3)
    #define ATL_pfl1W(mem) __builtin_prefetch(mem, 1, 3)
    #define ATL_GOT_L1PREFETCH