I'm trying to build some libraries from Boost using bjam, as it is suggested here(http://www.boost.org/doc/libs/1_45_0/doc/html/boost_asio/using.html). Because i have more than one compiler installed, I've changed the command line a bit to chose the toolset(mingw that comes together with Qt SDK) explicitly: D:\boost_1_45_0>bjam toolset=gcc --with-system --with-thread --with-datetime --with-regex --with-serialization stage Immediately i get the error message: mingw.jam: No such file or directory D:/boost_1_45_0/tools/build/v2/build\toolset.jam:38: in toolset.using rule mingw.init unknown in module toolset. D:/boost_1_45_0/tools/build/v2/build\project.jam:881: in using project-config.jam:1: in modules.load D:/boost_1_45_0/tools/build/v2\build-system.jam:257: in load-config D:/boost_1_45_0/tools/build/v2\build-system.jam:423: in load-configuration-files D:/boost_1_45_0/tools/build/v2\build-system.jam:554: in load D:\boost_1_45_0\tools\build\v2/kernel\modules.jam:283: in import D:\boost_1_45_0\tools\build\v2\kernel\bootstrap.jam:142: in boost-build D:\boost_1_45_0\boost-build.jam:17: in module scope what should i do?