Hi, I am struggling to compile a simple test with the Unit test library. It seems to be a linker error when trying to link the unit_test_framework library. I have tried diffrerent options but to no avail. I have tried to link it with a visual studio library as well, but I am still receiving the same error. clang++.exe -o bin\Debug\QuickTest.exe obj\Debug\functions.o obj\Debug\functionsTest.o obj\Debug\maintest.o *C:\boost_1_55_0\stage\lib\libboost_unit_test_framework-mgw48-mt-1_55.a* obj\Debug\functionsTest.o: In function `_cxx_global_var_init2': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:4: undefined reference to `_imp___ZN5boost9unit_test9ut_detail24auto_test_unit_registrarC1EPNS0_9test_caseEm' obj\Debug\functionsTest.o: In function `ZN8Multiply11test_methodEv': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:6: *undefined reference to * `_imp___ZN5boost9unit_test15unit_test_log_t14set_checkpointENS0_13basic_cstringIKcEEjS4_' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:6: undefined reference to `_imp___ZN5boost10test_tools16predicate_resultC1Eb' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:6: *undefined reference to * `_imp___ZN5boost10test_tools9tt_detail10check_implERKNS0_16predicate_resultERKNS_9unit_test12lazy_ostreamENS5_13basic_cstringIKcEEjNS1_10tool_levelENS1_10check_typeEjz' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:6: *undefined reference to* `_imp___ZN5boost10test_tools16predicate_resultD1Ev' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:7: undefined reference to `_imp___ZN5boost10test_tools16predicate_resultD1Ev' obj\Debug\functionsTest.o: In function `_dtor__ZZN5boost9unit_test9singletonINS0_15unit_test_log_tEE8instanceEvE8the_inst': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/functionsTest.cpp:38: *undefined reference to* `_imp___ZN5boost9unit_test15unit_test_log_tD1Ev' obj\Debug\functionsTest.o: In function `ZN5boost9unit_test9singletonINS0_15unit_test_log_tEE8instanceEv': C:\boost_1_55_0\boost/test/utils/trivial_singleton.hpp:38: undefined reference to `_imp___ZN5boost9unit_test15unit_test_log_tC1Ev' obj\Debug\functionsTest.o: In function `ZN5boost9unit_test14make_test_caseERKNS0_9callback0INS0_9ut_detail6unusedEEENS0_13basic_cstringIKcEE': C:\boost_1_55_0\boost/test/unit_test_suite_impl.hpp:255: undefined reference to `_imp___ZN5boost9unit_test9ut_detail24normalize_test_case_nameENS0_13basic_cstringIKcEE' C:\boost_1_55_0\boost/test/unit_test_suite_impl.hpp:255: undefined reference to `_imp___ZN5boost9unit_test9test_caseC1ENS0_13basic_cstringIKcEERKNS0_9callback0INS0_9ut_detail6unusedEEE' obj\Debug\maintest.o: In function `main': C:\boost_1_55_0\boost/test/unit_test.hpp:59: undefined reference to `_imp___ZN5boost9unit_test14unit_test_mainEPFbvEiPPc' obj\Debug\maintest.o: In function `_cxx_global_var_init2': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:5: undefined reference to `_imp___ZN5boost9unit_test9ut_detail24auto_test_unit_registrarC1EPNS0_9test_caseEm' obj\Debug\maintest.o: In function `ZN29SimpleTestInMainTestingModule11test_methodEv': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:7: undefined reference to `_imp___ZN5boost9unit_test15unit_test_log_t14set_checkpointENS0_13basic_cstringIKcEEjS4_' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:7: undefined reference to `_imp___ZN5boost10test_tools16predicate_resultC1Eb' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:7: undefined reference to `_imp___ZN5boost10test_tools9tt_detail10check_implERKNS0_16predicate_resultERKNS_9unit_test12lazy_ostreamENS5_13basic_cstringIKcEEjNS1_10tool_levelENS1_10check_typeEjz' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:7: undefined reference to `_imp___ZN5boost10test_tools16predicate_resultD1Ev' D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:8: undefined reference to `_imp___ZN5boost10test_tools16predicate_resultD1Ev' obj\Debug\maintest.o: In function `_dtor__ZZN5boost9unit_test9singletonINS0_15unit_test_log_tEE8instanceEvE8the_inst': D:\Ex Mente\Software\_CHK.Sandbox\quickCplusplusTest\QuickTest/maintest.cpp:38: undefined reference to `_imp___ZN5boost9unit_test15unit_test_log_tD1Ev' collect2.exe: error: ld returned 1 exit status clang++.exe: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation) Kind Regards, Christoff