Using VC 7.1 I have a VC Solution with all my test programs. These use the serialization library and boost test - test_exec_monitor. I've recently wanted to make some changes in 1.35 and now none of my projects link anymore. They build with bjam but I can't get them linked with VC 7 IDE. I don't have autolink suppressed. There is no message indicating that it can't find file test.....lib. What I get is undefined symbols. This i od to me as I don't use any symbosl unit_test .... I've also tried including the library unit_test_framework. That doesn't seem to help either. Any suggestions would be appreciated. Robert Ramey test_simple_class.obj : error LNK2019: unresolved external symbol "void __cdecl boost::test_tools::tt_detail::check_impl(class boost::test_tools::predicate_result const &,class boost::basic_wrap_stringstream<char> &,class boost::unit_test::basic_cstring<char const >,unsigned int,enum boost::test_tools::tt_detail::tool_level,enum boost::test_tools::tt_detail::check_type,unsigned int,...)" (?check_impl@tt_detail@test_tools@boost@@YAXABVpredicate_result@23@AAV?$basic_wrap_stringstream@D@3@V?$basic_cstring@$$CBD@unit_test@3@IW4tool_level@123@W4check_type@123@IZZ) referenced in function "int __cdecl test_main(int,char * * const)" (?test_main@@YAHHQAPAD@Z) test_simple_class.obj : error LNK2019: unresolved external symbol "public: void __thiscall boost::unit_test::unit_test_log_t::set_checkpoint(class boost::unit_test::basic_cstring<char const >,unsigned int,class boost::unit_test::basic_cstring<char const >)" (?set_checkpoint@unit_test_log_t@unit_test@boost@@QAEXV?$basic_cstring@$$CBD@23@I0@Z) referenced in function "int __cdecl test_main(int,char * * const)" (?test_main@@YAHHQAPAD@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::exception_caught(class boost::execution_exception const &)" (?exception_caught@unit_test_log_t@unit_test@boost@@UAEXABVexecution_exception@3@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::assertion_result(bool)" (?assertion_result@unit_test_log_t@unit_test@boost@@UAEX_N@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_aborted(class boost::unit_test::test_unit const &)" (?test_unit_aborted@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_skipped(class boost::unit_test::test_unit const &)" (?test_unit_skipped@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_finish(class boost::unit_test::test_unit const &,unsigned long)" (?test_unit_finish@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@K@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_unit_start(class boost::unit_test::test_unit const &)" (?test_unit_start@unit_test_log_t@unit_test@boost@@UAEXABVtest_unit@23@@Z) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_aborted(void)" (?test_aborted@unit_test_log_t@unit_test@boost@@UAEXXZ) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_finish(void)" (?test_finish@unit_test_log_t@unit_test@boost@@UAEXXZ) test_simple_class.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall boost::unit_test::unit_test_log_t::test_start(unsigned long)" (?test_start@unit_test_log_t@unit_test@boost@@UAEXK@Z) MSVCRTD.lib(crtexe.obj) : error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup