--- old/src/cpu/zero/vm/globals_zero.hpp	2012-11-26 23:53:06.139888339 +0100
+++ new/src/cpu/zero/vm/globals_zero.hpp	2012-11-26 23:53:06.051888463 +0100
@@ -52,11 +52,7 @@
 define_pd_global(bool,  RewriteBytecodes,     true);
 define_pd_global(bool,  RewriteFrequentPairs, true);
 
-#ifdef _ALLBSD_SOURCE
 define_pd_global(bool,  UseMembar,            true);
-#else
-define_pd_global(bool,  UseMembar,            false);
-#endif
 
 // GC Ergo Flags
 define_pd_global(intx, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread