Boost.graph's stoer_wagner_test won't link on mingw32, with multiple definitions of various unit_test::test_case::... symbols. All symbols seem to be found in test/impl/unit_test_suite.ipp. Dynamic libraries for both boost_test_exec_monitor and boost_unit_test_framework are linked in. The compile has: -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_DYN_LINK=1 -DBOOST_TEST_NO_AUTO_LINK=1 So is this graph test's compile or link wrong (but being forgiven on other platforms), or is test (notably unit_test_suite.ipp) not exporting symbols as it should (and that's being forgiven on other platforms)? The same problem (conceptually) is happening on msvc8, though it calls out more than just unit_test_suite.ipp.