Hi, I've got the following program to test the unit test suite: --------------------------------- // ICFGTest.cpp : Defines the entry point for the console application. // #include using namespace boost::unit_test_framework; void testPass() { BOOST_CHECK( true ); } test_suite* init_unit_test_suite( int argc, char* argv[] ) { test_suite* test= BOOST_TEST_SUITE( "Test test suite" ); test->add( BOOST_TEST_CASE( &testPass )); return test; } --------------------------------- when I link this with the boost v1.30 unit test framework, I get the following linker errors: Linking... libboost_unit_test_framework.lib(unit_test_suite.obj) : error LNK2005: "public: virtual unsigned long __thiscall boost::unit_test_framework::test_case::size(void)const " (?size@test_case@unit_test_framework@boost@@UBEKXZ) already defined in ICFGTest.obj ICFGTest.obj : error LNK2019: unresolved external symbol "bool __cdecl boost::test_toolbox::detail::test_and_continue_impl(bool,struct boost::test_toolbox::detail::wrapstrstream const &,char const *,int,bool,enum boost::unit_test_framework::report_level)" (?test_and_continue_impl@detail@test_toolbox@boost @@YA_N_NABUwrapstrstream@123@PBDH0W4report_level@u nit_test_framework@3@@Z) referenced in function "void __cdecl testPass(void)" (?testPass@@YAXXZ) ICFGTest.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::unit_test_framework::test_suite::test_suite(char const *)" (??0test_suite@unit_test_framework@boost@@QAE@PBD@Z) referenced in function "class boost::unit_test_framework::test_suite * __cdecl init_unit_test_suite(int,char * * const)" (?init_unit_test_suite@@YAPAVtest_suite@unit_test_ framework@boost@@HQAPAD@Z) Debug/ICFGTest.exe : fatal error LNK1120: 2 unresolved externals ------------------------ The unresolved symbol test_and_continue_impl seems most curious since one of it's parameters expects a wrapstrstream, not a wrap_strstream as the function declaration itself would suggest. Any ideas what I'm doing wrong? (NOTE: I'm linking to the static multi-threaded lib). Thanks! Dan