As others have pointed out there were a number of "mysterious" errors having to do with multiply defined symbols during link. The problem was in the Boost.Test library which was indirectly relying on std::locale support. The indirect part is that it's using boost/io/ios_state.hpp which *assumes* that std::locale is available. Anyway.. I've checked in changes to make ios_state.hpp compile in the face of missing locale support. Basically I just conditionally remove the part that use std::locale based on the BOOST_NO_STD_LOCALE config macro. I also removed the Boost.Test change that causes the multiple symbols. I don't know how many libraries and compilers this affects. But if you are running incremental tests, expect your next run to be considerably longer as it's going to recompile Boost.Test. Which will likely recompile everything else. -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - Grafik/jabber.org