Hello, I already sent this message to boost-users about 15 minutes ago. Unfortunately I did not receive a confirmation mail (probably a safe-mail issue), so I am trying it again... one of our customers wants us to compile a native Windows x64 build of our application. As we are using a lot of C++0x code, we are forced to use a Win64 port of gcc 4.x/MinGW (http://mingw-w64.sourceforge.net/) instead of the regular Visual Studio 8 x64 compiler. Unfortunately building boost with mingw-w64 fails. This is the build log: warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. Building Boost.Regex with the optional Unicode/ICU support disabled. Note: Please refer to the Boost.Regex documentation for more information Note: this is a strictly optional feature. Skipping build of: ./install <build>no in common properties Skipping build of: ./install <build>no in common properties Skipping build of: ./install <build>no in common properties Skipping build of: ./install <build>no in common properties ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_system-mgw44-mt-1_37.lib(clean) for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\threading-multi>error_code.o... ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_system-mgw44-mt-1_37.lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\threading-multi>error_code.o... ...skipped <pbuild\mingw-x64\lib>libboost_system-mgw44-mt-1_37.lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_system-mgw44-mt-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_system-mgw44-mt.lib for lack of <pbuild\mingw-x64\lib>libboost_system-mgw44-mt-1_37.lib... ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_37.lib(clean) for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o... ...skipped <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_37.lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>error_code.o... ...skipped <pbuild\mingw-x64\lib>libboost_system-mgw44-1_37.lib for lack of <pbin.v2\libs\system\build\gcc-mingw-4.4.0\release\link-static>libboost_system-mgw44-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_system-mgw44.lib for lack of <pbuild\mingw-x64\lib>libboost_system-mgw44-1_37.lib... ...skipped <pbin.v2\libs\date_time\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_date_time-mgw44-mt-1_37.lib(clean) for lack of <pbin.v2\libs\date_time\build\gcc-mingw-4.4.0\release\link-static\threading-multi>greg_month.o... ...skipped <pbin.v2\libs\date_time\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_date_time-mgw44-mt-1_37.lib for lack of <pbin.v2\libs\date_time\build\gcc-mingw-4.4.0\release\link-static\threading-multi>greg_month.o... ...skipped <pbuild\mingw-x64\lib>libboost_date_time-mgw44-mt-1_37.lib for lack of <pbin.v2\libs\date_time\build\gcc-mingw-4.4.0\release\link-static\threading-multi>libboost_date_time-mgw44-mt-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_date_time-mgw44-mt.lib for lack of <pbuild\mingw-x64\lib>libboost_date_time-mgw44-mt-1_37.lib... ... ...skipped <pbuild\mingw-x64\lib>libboost_math_tr1f-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_math_tr1f-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_math_tr1l-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_math_tr1l-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_math_c99-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_math_c99-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_math_c99f-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_math_c99f-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_math_c99l-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_math_c99l-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_program_options-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_program_options-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_serialization-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_serialization-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_wserialization-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_wserialization-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_signals-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_signals-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_prg_exec_monitor-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_prg_exec_monitor-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_unit_test_framework-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_unit_test_framework-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_thread-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_thread-mgw44-mt-d-1_37.lib... ...skipped <pbin.v2\libs\wave\build\gcc-mingw-4.4.0\debug\link-static\threading-multi>libboost_wave-mgw44-mt-d-1_37.lib(clean) for lack of <pbin.v2\libs\wave\build\gcc-mingw-4.4.0\debug\link-static\threading-multi>instantiate_cpp_exprgrammar.o... ...skipped <pbin.v2\libs\wave\build\gcc-mingw-4.4.0\debug\link-static\threading-multi>libboost_wave-mgw44-mt-d-1_37.lib for lack of <pbin.v2\libs\wave\build\gcc-mingw-4.4.0\debug\link-static\threading-multi>instantiate_cpp_exprgrammar.o... ...skipped <pbuild\mingw-x64\lib>libboost_wave-mgw44-mt-d-1_37.lib for lack of <pbin.v2\libs\wave\build\gcc-mingw-4.4.0\debug\link-static\threading-multi>libboost_wave-mgw44-mt-d-1_37.lib... ...skipped <pbuild\mingw-x64\lib>libboost_wave-mgw44-mt-d.lib for lack of <pbuild\mingw-x64\lib>libboost_wave-mgw44-mt-d-1_37.lib... ...failed updating 2436 targets... Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties Skipping build of: ./headers <build>no in common properties warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. Building Boost.Regex with the optional Unicode/ICU support disabled. Note: Please refer to the Boost.Regex documentation for more information Note: this is a strictly optional feature. Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties Skipping build of: ./build_all <build>no in common properties This is our build batch file. mingwvars simply adds the MinGW-w64/bin folder to the Path envionment variable. call mingwvars bjam --toolset=gcc --prefix=.\build\mingw-x64 --without-mpi --without-python --build-type=complete -address-model=64 install bjam --toolset=gcc --prefix=.\build\mingw-x64 --without-mpi --without-python --build-type=complete -address-model=64 clean rd /s /q .\bin.v2 What did we do wrong?