Hi, on the regression test I see this error Test output: Sandia-pgi-11.9 - thread - test_barrier / pgi-11.9 Rev 76060 / Mon, 19 Dec 2011 10:30:05 +0000 *Report Time: *Mon, 19 Dec 2011 21:30:12 +0000 Compile [2011-12-19 12:43:58 UTC]: fail "pgCC" -INLINE:none -Kieee -fpic -fPIC -gopt -Minform=warn -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_NO_AUTO_LINK=1 -DBOOST_THREAD_POSIX -DBOOST_THREAD_USE_DLL=1 -D__need_IOV_MAX -I".." -c -o "/scratch/kbelco/boost/results/boost/bin.v2/libs/thread/test/test_barrier.test/pgi-11.9/debug/threading-multi/test_barrier.o" "../libs/thread/test/test_barrier.cpp" "../boost/config/requires_threads.hpp", line 86: catastrophic error: #error directive: "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" # error "Compiler threading support is not turned on. Please consult your compiler's documentation for the appropriate options to use" ^ 1 catastrophic error detected in the compilation of "../libs/thread/test/test_barrier.cpp". Compilation terminated. Is something missing in the boost/config/requires_threads.hpp file? Best, Vicente