Attempting to run regression tests for the 'test' library on the Boost trunk I receive as output: "..\..\..\libs\test\build\Jamfile.v2:107: in modules.load rule boost-install unknown in module Jamfile</C:/Programming/VersionControl/boost/libs/test/build>. C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:314: in load-jamfile C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:62: in project.load C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:766: in project.use C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:89: in load-used-projects C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:73: in load C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:115: in load-parent C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:464: in initialize C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:309: in load-jamfile C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:62: in load C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:115: in load-parent C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:464: in initialize C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:309: in load-jamfile C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:62: in load C:/Programming/VersionControl/boost/tools/build/v2/build\project.jam:168: in project.find C:/Programming/VersionControl/boost/tools/build/v2\build-system.jam:570: in load C:\Programming\VersionControl\boost\tools\build\v2/kernel\modules.jam:283: in import C:\Programming\VersionControl\boost\tools\build\v2\kernel\bootstrap.jam:142: in boost-build C:\Programming\VersionControl\boost\boost-build.jam:17: in module scope" All other regression tests for libraries produce no Boost Build errors. Can anybody tell me what is wrong here ?