Hello all, I have the following compile error in my project, using the SVN release branch : boost\boost\boost/pool/detail/mutex.hpp(67) : error C2872: 'CRITICAL _SECTION' : ambiguous symbol could be 'C:\Program Files\Microsoft Platform SDK\include\winbase.h(295) : RTL_CRITICAL_SECTION CRITICAL_SECTION' or 'third_party\boost\boost\boost/detail/lwm_win32_cs.hpp(33) : boost::d etail::CRITICAL_SECTION' It can be easly by fixed by adding "::" in front of the CRITICAL_SECTION member definition of the win32_mutex class (see pool/detail/mutex.hpp). But is there any reason not to use boost/detail/lightweight_mutex.hpp in the pool library ? Regards, Samuel