Not sure now. I downloaded version 1.30.2 of boost. The build.bat file in {root}\tools\build\jam_src cannot work correctly with mingw as it says. First I have to add following to build.bat for it can guess mingw call :Test_Path gcc.exe if not errorlevel 1 ( set BOOST_JAM_TOOLSET=mingw set BOOST_JAM_TOOLSET_ROOT=%FOUND_PATH%..\ goto :eof) setlocal & endlocal It guess first? Should use my environment first! I have set both BOOST_JAM_TOOLSET and TOOLS! set TOOLS=mingw Set BOOST_JAM_TOOLSET=mingw Even build.bat can guess my mingw, it failed as following: execunix.c: In function `execcmd': execunix.c:214: warning: passing arg 3 of `spawnvp' from incompatible pointer type C:\DOCUME~1\hyu\LOCALS~1\Temp/ccKYiaaa.o(.text+0x12f):timestamp.c: undefined reference to `file_time' C:\DOCUME~1\hyu\LOCALS~1\Temp/ccKYiaaa.o(.text+0x2cd):timestamp.c: undefined reference to `file_archscan' C:\DOCUME~1\hyu\LOCALS~1\Temp/ccKYiaaa.o(.text+0x315):timestamp.c: undefined reference to `file_dirscan' C:\DOCUME~1\hyu\LOCALS~1\Temp/ccCOkaaa.o(.text+0x131c):builtins.c: undefined reference to `file_dirscan' gcc -o bin.mingwx86\jam -DNDEBUG -DOPT_HEADER_CACHE_EXT -DOPT_GRAPH_DEBUG_EXT -DOP T_SEMAPHORE -DOPT_FIX_TARGET_VARIABLES_EXT -DOPT_IMPROVED_PATIENCE_EXT -DYYSTACKSIZE=5000 -s -O3 -finline-functions -DMINGW command.c compile.c exp and.c glob.c hash.c hcache.c headers.c hdrmacro.c jam.c jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c parse.c regexp.c rules.c scan.c search.c subst.c timestamp.c variable.c modules.c strings.c filesys.c builtins.c pwd.c execunix.c fileunix.c pathunix.c ...failed .cc bin.mingwx86\jam... ...failed updating 1 target... ...updated 2 targets... Can anyone help me? I am not on the list. Please reply to my email address as well. Thanks Herbert Yu