C:\_projects\_coding\_scripts\boost>cd c:\_projects\_coding\_sdk\boost\tools\build\jam_src 

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>call build mingw 
###
### Using 'mingw' toolset.
###

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>rd /S /Q bootstrap.mingw 

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>md bootstrap.mingw 

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>gcc -DNT -o bootstrap.mingw\jam0.exe  command.c compile.c execnt.c execunix.c execvms.c expand.c filent.c fileos2.c fileunix.c filevms.c glob.c hash.c hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c parse.c pathunix.c pathvms.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 class.c w32_getreg.c native.c modules/set.c modules/path.c modules/regex.c  modules/property-set.c modules/sequence.c modules/order.c 

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>.\bootstrap.mingw\jam0 -f build.jam --toolset=mingw "--toolset-root= " clean 
...found 1 target...
...updating 1 target...
...updated 1 target...

C:\_projects\_coding\_sdk\boost\tools\build\jam_src>.\bootstrap.mingw\jam0 -f build.jam --toolset=mingw "--toolset-root= "          
...found 83 targets...
...updating 5 targets...
.mkdir. bin.ntx86
spawn: No such file or directory