Hello all, Attached a testcase how I use the boost test library. Compiling goes well, but when I try to run it I get a 'symbol lookup error': matthijs@hammer % ./main ./main: symbol lookup error: ./main: undefined symbol: _ZN5boost9unit_test9ut_detail24auto_test_unit_registrarC1ENS0_13basic_cstringIKcEE I compile my files with the following lines: g++ -o main.o -c -I/usr/src/boost_1_49_0 -g -Werror -Wall -std=c++0x main.cpp g++ -o test.o -c -I/usr/src/boost_1_49_0 -g -Werror -Wall -std=c++0x test.cpp g++ -o main -L/usr/src/boost_1_49_0/stage/lib main.o test.o -lboost_unit_test_framework This is done with a fresh install of boost 1.49. (Compiled with ./bootstrap.sh && ./b2 -j3) Compiler: gcc-4.6 If I use the most recent version of trunk (r77131) then everything works as expected. If more information is needed, please let me know. Regards, Matthijs Möhlmann