After getting the latest Boost from the trunk, and after running bootstrap I try '.\b2 install --prefix=c:\programming\bin' and get: ---------------------------------------------------------------------- Performing configuration checks - 32-bit : yes - arm : no - mips1 : no - power : no - sparc : no - x86 : yes - has_icu builds : no warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam - zlib : no - iconv (libc) : no - iconv (separate) : no - icu : no - icu (lib64) : no - message-compiler : yes - gcc visibility : no - long double support : yes warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. warning: No python installation configured and autoconfiguration note: failed. See http://www.boost.org/libs/python/doc/building.html note: for configuration instructions or pass --without-python to note: suppress this message and silently skip all Boost.Python targets - zlib : no (cached) C:/Programming/VersionControl/boost/tools/build/v2/build\virtual-target.jam:1099 : in virtual-target.register-actual-name from module virtual-target error: Duplicate name of actual target: <pc:\programming\bin\lib>libboost_date_t ime-vc110-mt-gd-1_54.lib error: previous virtual target { common%common.copy-libboost_date_time-vc110-mt- gd-1_54.lib.STATIC_LIB { msvc%msvc.archive-libboost_date_time-vc110-mt-gd-1_54.l ib.STATIC_LIB { msvc%msvc.compile.c++-gregorian\greg_month.obj.OBJ { gregorian/g reg_month.cpp.CPP } } { msvc%msvc.compile.c++-gregorian\greg_weekday.obj.OBJ { g regorian/greg_weekday.cpp.CPP } } { msvc%msvc.compile.c++-gregorian\date_generat ors.obj.OBJ { gregorian/date_generators.cpp.CPP } } } } error: created from ./install-proper-lib-static error: another virtual target { common%common.copy-libboost_date_time-vc110-mt-g d-1_54.lib.STATIC_LIB { msvc%msvc.archive-libboost_date_time-vc110-mt-gd-1_54.li b.STATIC_LIB { msvc%msvc.compile.c++-gregorian\greg_month.obj.OBJ { gregorian/gr eg_month.cpp.CPP } } { msvc%msvc.compile.c++-gregorian\greg_weekday.obj.OBJ { gr egorian/greg_weekday.cpp.CPP } } { msvc%msvc.compile.c++-gregorian\date_generato rs.obj.OBJ { gregorian/date_generators.cpp.CPP } } } } error: created from ./install-proper-lib-static error: added properties: <log-api>winnt error: removed properties: <log-api>generic C:/Programming/VersionControl/boost/tools/build/v2/build\virtual-target.jam:484: in actualize-no-scanner from module object(file-target)@4017 C:/Programming/VersionControl/boost/tools/build/v2/build\virtual-target.jam:134: in class@virtual-target.actualize from module object(file-target)@4017 C:/Programming/VersionControl/boost/tools/build/v2\build-system.jam:720: in load from module build-system C:\Programming\VersionControl\boost\tools\build\v2/kernel\modules.jam:289: in im port from module modules C:\Programming\VersionControl\boost\tools\build\v2/kernel/bootstrap.jam:139: in boost-build from module C:\Programming\VersionControl\boost\boost-build.jam:17: in module scope from module ------------------------------------------------------------------------ This is on Windows but the same thing occurs on my Linux distros. Cannot this be fixed ? I posted the same message for Linux failure on the Boost Build mailing list but received no response.