I built boost thus: bjam "-sTOOLS=darwin" -sBUILD="debug release <runtime-link>static/dynamic" After hacking around the xml_grammar.cpp problems, I get the link errors where the following functions cannot be found. (Removed a lot of extra stuff to try and display only the library and missing function. If you'd like to see all 183 lines that is possible.) I'm wondering if some test functions that are not meant to be in the library are referenced by something included in the library. darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/debug/runtime-link-static/shared-linkable-true/libboost_prg_exec_monitor-sd-1_32.dylib ld: Undefined symbols: cpp_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_prg_exec_monitor-d-1_32.dylib ld: Undefined symbols: cpp_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_prg_exec_monitor-d-1_32.dylib ld: Undefined symbols: cpp_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/release/runtime-link-static/shared-linkable-true/libboost_prg_exec_monitor-s-1_32.dylibld: Undefined symbols:cpp_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_prg_exec_monitor.dylib/darwin/release/shared-linkable-true/libboost_prg_exec_monitor-1_32.dylib ld: Undefined symbols: cpp_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_test_exec_monitor.dylib/darwin/debug/runtime-link-static/shared-linkable-true/libboost_test_exec_monitor-sd-1_32.dylibld: Undefined symbols:test_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_test_exec_monitor.dylib/darwin/debug/shared-linkable-true/libboost_test_exec_monitor-d-1_32.dylibld: Undefined symbols:test_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_test_exec_monitor.dylib/darwin/release/shared-linkable-true/libboost_test_exec_monitor-1_32.dylibld: Undefined symbols:test_main(int, char**) darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_unit_test_framework.dylib/darwin/debug/runtime-link-static/shared-linkable-true/libboost_unit_test_framework-sd-1_32.dylibld: Undefined symbols:init_unit_test_suite(int, char**) -- Alan Gutierrez - alan@engrm.com