Hi, This might be a frequent question asked, but I can't seem to find a proper response. I'm trying to build boost using the current version of mingw, from under msys, but I can't seem to make it work. I tried boost 1.45.0 and 1.46.1 as well. here are my results: boost 1.45.0: akos@RAKKU /c/Users/akos/src/boost_1_45_0 $ ./bootstrap.sh --with-toolset=mingw --prefix=/c/Users/akos/usr Building Boost.Jam with toolset mingw... tools/build/v2/engine/src/bin.ntx86/bjam Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in project-config.jam.3 Generating Boost.Build configuration in project-config.jam... Bootstrapping is done. To build, run: ./bjam To adjust configuration, edit 'project-config.jam'. Further information: - Command line help: ./bjam --help - Getting started guide: http://www.boost.org/more/getting_started/unix-variants.html - Boost.Build documentation: http://www.boost.org/boost-build2/doc/html/index.html akos@RAKKU /c/Users/akos/src/boost_1_45_0 $ ./bjam mingw.jam: No such file or directory c:/Users/akos/src/boost_1_45_0/tools/build/v2/build\toolset.jam:38: in toolset.u sing rule mingw.init unknown in module toolset. c:/Users/akos/src/boost_1_45_0/tools/build/v2/build\project.jam:881: in using project-config.jam:12: in modules.load c:/Users/akos/src/boost_1_45_0/tools/build/v2\build-system.jam:257: in load-conf ig c:/Users/akos/src/boost_1_45_0/tools/build/v2\build-system.jam:423: in load-conf iguration-files c:/Users/akos/src/boost_1_45_0/tools/build/v2\build-system.jam:554: in load c:\Users\akos\src\boost_1_45_0\tools\build\v2/kernel\modules.jam:283: in import c:\Users\akos\src\boost_1_45_0\tools\build\v2\kernel\bootstrap.jam:142: in boost -build c:\Users\akos\src\boost_1_45_0\boost-build.jam:17: in module scope when trying boos 1.46.1: akos@RAKKU /c/Users/akos/src/boost_1_46_1 $ ./bootstrap.sh --with-toolset=mingw --prefix=/c/Users/akos/usr Building Boost.Jam with toolset mingw... tools/build/v2/engine/src/bin.ntx86/bja m Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in project-config.jam... Bootstrapping is done. To build, run: ./bjam To adjust configuration, edit 'project-config.jam'. Further information: - Command line help: ./bjam --help - Getting started guide: http://www.boost.org/more/getting_started/unix-variants.html - Boost.Build documentation: http://www.boost.org/boost-build2/doc/html/index.html akos@RAKKU /c/Users/akos/src/boost_1_46_1 $ ./bjam mingw.jam: No such file or directory c:/Users/akos/src/boost_1_46_1/tools/build/v2/build\toolset.jam:38: in toolset.u sing rule mingw.init unknown in module toolset. c:/Users/akos/src/boost_1_46_1/tools/build/v2/build\project.jam:886: in using project-config.jam:12: in modules.load c:/Users/akos/src/boost_1_46_1/tools/build/v2\build-system.jam:257: in load-conf ig c:/Users/akos/src/boost_1_46_1/tools/build/v2\build-system.jam:423: in load-conf iguration-files c:/Users/akos/src/boost_1_46_1/tools/build/v2\build-system.jam:554: in load c:\Users\akos\src\boost_1_46_1\tools\build\v2/kernel\modules.jam:283: in import c:\Users\akos\src\boost_1_46_1\tools\build\v2\kernel\bootstrap.jam:142: in boost -build c:\Users\akos\src\boost_1_46_1\boost-build.jam:17: in module scope trying other settings, e.g. a toolset of gcc will not work :( trying the bootstrap.bat file with the same command line parameters don't work, as they expect to find the MS C++ compiler, cl. I googled this issue, but did not find a solution that would eventually work :( I wonder what the proper process is to build boost on Windows using the current version of MingW. Akos PS: the gcc version I have is: $ gcc --version gcc.exe (GCC) 4.5.2 Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.