diff -Naur ATLAS.orig/include/atlas_pca.h ATLAS/include/atlas_pca.h

--- ATLAS.orig/include/atlas_pca.h	2013-01-08 19:15:40.000000000 +0100

+++ ATLAS/include/atlas_pca.h	2014-10-23 13:45:36.956698637 +0200

@@ -26,7 +26,7 @@

    #endif

 #elif defined(ATL_ARCH_POWER3) || defined(ATL_ARCH_POWER4) || \

       defined(ATL_ARCH_POWER5) || defined(ATL_ARCH_POWER6) || \

-      defined(ATL_ARCH_POWER7)

+      defined(ATL_ARCH_POWER7) || 1

    #ifdef __GNUC__

       #define ATL_membarrier __asm__ __volatile__ ("dcs")

 /*      #define ATL_USEPCA 1 */