I am learning to create simple unit tests using Boost.Test. I am getting the following error when I run bjam. C:/DevTools/boost_1_44_0/tools/build/v2/build\feature.jam:138: in feature.feature from module feature error: feature already defined: error: in feature declaration: error: feature "threadapi" : "pthread" "win32" : "propagated" c:\DevTools\boost_1_44_0\libs\thread\build\Jamfile.v2:57: in modules.load from module Jamfile C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:310: in load-jamfile from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:62: in project.load from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:760: in project.use from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:89: in load-used-projects from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:73: in load from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:115: in load-parent from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:458: in initialize from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:300: in load-jamfile from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:62: in load from module project C:/DevTools/boost_1_44_0/tools/build/v2/build\project.jam:168: in project.find from module project C:/DevTools/boost_1_44_0/tools/build/v2\build-system.jam:569: in load from module build-system C:\DevTools\boost_1_44_0\tools\build\v2/kernel\modules.jam:283: in import from module modules C:\DevTools\boost_1_44_0\tools\build\v2\kernel\bootstrap.jam:142: in boost-build from module C:\DevTools\boost_1_44_0\boost-build.jam:17: in module scope from module My Jamroot file is shown below : ------------------------------------- import os ; import testing ; use-project /blues/system : c:/devtools/boost_1_44_0/libs/system/build ; use-project /blues/thread : c:/devtools/boost_1_44_0/libs/thread/build ; use-project /blues/test : c:/devtools/boost_1_44_0/libs/test/build ; project : : requirements <threading>multi <link>static <include>c:/devtools/boost_1_44_0 <define>_WIN32_WINNT=0x0501 <define>_CRT_SECURE_NO_WARNINGS=1 <define>_SCL_SECURE_NO_WARNINGS=1 ; and my Jamfile is shown below : ------------------------------------- alias unit_test_framework : # Sources /blues/test//boost_unit_test_framework ; explicit unit_test_framework ; run-fail unit_test_example_01.cpp unit_test_framework ; How can I successfully build the unit test ? Thanks.