Hi, (Apologies if this gets through twice, I think my mail client used the wrong email address the first time) Thanks for taking the time to read through this. First things first: I am using Visual C++ 2005 Express Edition, I have compiled boost version 1.32. I have included the path to the include directory and the lib files directory. Boost is working I have managed to compile and run a number of the other examples (including linking against the libs created during the bjam process (eg boost.threads). The code that has the link error was taken from: http://www.boost.org/libs/test/doc/components/utf/getting_started/index. html --Code-- #include <boost/test/unit_test.hpp> using namespace boost::unit_test; test_suite* init_unit_test_suite( int argc, char* argv[] ) { test_suite* test= BOOST_TEST_SUITE( "const_string test" ); return test; } // EOF --End Code-- The comment at the end of the code suggests that I can compile this code with no errors. Now for the errors: -- Build Log Output -- ------ Build started: Project: Test, Configuration: Debug Win32 ------ Compiling... const_string_test.cpp Linking... const_string_test.obj : error LNK2019: unresolved external symbol "public: __thiscall boost::unit_test::test_suite::test_suite(class boost::unit_test::basic_cstring<char const >)" (??0test_suite@unit_test@boost@@QAE@V?$basic_cstring@$$CBD@12@@Z) referenced in function "class boost::unit_test::test_suite * __cdecl init_unit_test_suite(int,char * * const)" (?init_unit_test_suite@@YAPAVtest_suite@unit_test@boost@@HQAPAD@Z) LIBCMTD.lib(crt0.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup Debug/Test.exe : fatal error LNK1120: 2 unresolved externals Build log was saved at <--SNIPPED LOG PATH--> Test - 3 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== -- End Build Log Output -- I know it is probably something really simple but for the life of me I am just missing it =/. Let me know if you need any more information. Thanks for any advice you can give. Peter.