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diff -Naur ATLAS.orig/include/atlas_pca.h ATLAS/include/atlas_pca.h
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--- ATLAS.orig/include/atlas_pca.h	2013-01-08 19:15:40.000000000 +0100
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+++ ATLAS/include/atlas_pca.h	2014-10-23 13:45:36.956698637 +0200
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@@ -26,7 +26,7 @@
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    #endif
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 #elif defined(ATL_ARCH_POWER3) || defined(ATL_ARCH_POWER4) || \
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       defined(ATL_ARCH_POWER5) || defined(ATL_ARCH_POWER6) || \
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-      defined(ATL_ARCH_POWER7)
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+      defined(ATL_ARCH_POWER7) || 1
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    #ifdef __GNUC__
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       #define ATL_membarrier __asm__ __volatile__ ("dcs")
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 /*      #define ATL_USEPCA 1 */