The trunk version of boost/test/impl/debug.ipp uses std::memcpy without having included an appropriate header, as shown in http://tinyurl.com/yt3hv8 : [...] In file included from ../boost/test/included/unit_test.hpp:19, from ../libs/test/test/online_test.cpp:17: ../boost/test/impl/debug.ipp: In function ???char* boost::debug::<unnamed> ::copy_arg(boost::debug::<unnamed>::mbuffer&, boost::unit_test::const_string)???: ../boost/test/impl/debug.ipp:338: error: ???memcpy??? is not a member of ???std??? [...] Curiously enough it is only GCC 4.3.0 that catches the problem, probably because std::memcpy is implicitly included by some header or another in all other platforms. The attached patch should solve the problem. OK to commit? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo