same problem, Windows 7 - 64bit, Visual Studio 2010. first try: D:\Work\boost\boost_1_47_0>bootstrap D:\Work\boost\boost_1_47_0>.\b2 --layout=system --build-dir=builddir --with-date_time --with-exception --with-filesystem --with-iostreams --with-program_options --with-random --with-regex --with-serialization --with-signals --with-system --with-test --with-thread --build-type=minimal second try: D:\Work\boost\boost_1_47_0>bootstrap --with-libraries=date_time,exception,filesystem,iostreams,program_options,random,regex,serialization,signals,system,test,thread D:\Work\boost\boost_1_47_0>.\b2 --layout=system --build-dir=builddir output: D:/Work/boost/boost_1_47_0/tools/build/v2/build\virtual-target.jam:1079: in virtual-target.register-actual-name from module virtual-target error: Duplicate name of actual target: <pstage\lib>libboost_system.lib error: previous virtual target { common%common.copy-libboost_system.lib.STATIC_LIB { msvc%msvc.archive-libboost_system.lib.STATIC_LIB { msvc%msvc.compile.c++-error_code.obj.OBJ { e rror_code.cpp.CPP } } } } error: created from ./stage-proper error: another virtual target { common%common.copy-libboost_system.lib.STATIC_LIB { msvc%msvc.archive-libboost_system.lib.STATIC_LIB { msvc%msvc.compile.c++-error_code.obj.OBJ { er ror_code.cpp.CPP } } } } error: created from ./stage-proper error: added properties: <debug-symbols>off <define>NDEBUG <inlining>full <optimization>speed <runtime-debugging>off <variant>release error: removed properties: <debug-symbols>on <inlining>off <optimization>off <runtime-debugging>on <variant>debug D:/Work/boost/boost_1_47_0/tools/build/v2/build\virtual-target.jam:490: in actualize-no-scanner from module object(file-target)@3726 D:/Work/boost/boost_1_47_0/tools/build/v2/build\virtual-target.jam:135: in object(file-target)@3726.actualize from module object(file-target)@3726 D:/Work/boost/boost_1_47_0/tools/build/v2\build-system.jam:749: in load from module build-system D:\Work\boost\boost_1_47_0\tools\build\v2/kernel\modules.jam:283: in import from module modules D:\Work\boost\boost_1_47_0\tools\build\v2\kernel\bootstrap.jam:142: in boost-build from module D:\Work\boost\boost_1_47_0\boost-build.jam:17: in module scope from module