--- a/blender-2.72/intern/cycles/util/util_simd.h	2014-09-24 17:29:54.000000000 +0200
+++ b/blender-2.72/intern/cycles/util/util_simd.h	2014-10-01 07:51:49.201097986 +0200
@@ -62,10 +62,14 @@
 #define _tzcnt_u64 __tzcnt_u64
 #endif
 
+/// REMOVEME : Leads to build failure with gcc-4.8.3
+/// because both are different functions.
+#if 0
 #if defined(__LZCNT__)
 #define _lzcnt_u32 __lzcnt32
 #define _lzcnt_u64 __lzcnt64
 #endif
+#endif // 0
 
 #if defined(_WIN32) && !defined(__MINGW32__)