Hi, i get a few errors when building the following libraries on Mac OS X 10.3.4 libboost_test_exec_monitor libboost_unit_test_framework i'm building using bjam, and the following command line bjam -sTOOLS-darwin install sniplets of the errors are as follows: 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_31.dylib ld: Undefined symbols: cpp_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_31.dylib ld: Undefined symbols: test_main(int, char**) .... darwin-Link-DyLib-action bin/boost/libs/test/build/libboost_unit_test_framework.dylib/darwin/debug/shared-linkable-true/libboost_unit_test_framework-d-1_31.dylib ld: Undefined symbols: init_unit_test_suite(int, char**) am i missing something here? thanks --Tristan