[boost] Supported compilers: gcc on osx?

Hi All, If I check the supported compilers page, gcc on darwin is supported - but I get the following error (boost_1_34_1/boost_1_35_0) * *The utf conversion in boost.program_options, for example to_utf8 gives std::runtime_error: locale::facet::_S_create_c_locale name not valid How do I repair this? The osx locale tools are not as conveniant as say ubuntu's ... (Should I not use Xcode's gcc, but build my own with a proper stdc++, or is there some fix in the os ?) Further: I have osx 10.5, but bjam thinks I have 10.4 - this is not a problem I guess, but it sure is not correct: bin/darwin/debug/link-static/macosx-version-10.4/threading-multi/ (the build path) Regards, - Dirk