Hi All, This has been discussed before, but I can't find an answer, so here is another bjam build question. When I build the Boost libraries using the VC8 toolset on the PC, I create thread safe (-mt) versions of the libraries. When I build the Boost libraries on Darwin, there are never any thread safe library versions built, even if I specify "-sBUILD=<threading>multi" on the bjam command line. I have found threads that discuss use of the thread safe version of the regex lib, so I know that it exists and gets built on some platform(s). Why are there no thread safe libraries built for the Darwin toolset? On the surface, this seems like a bug, but I figure there must be some reasonable explanation. (Oh, please, let there be a reasonable explanation! :-) Regards, Rush