https://www.boost.org/doc/libs/1_68_0/more/getting_started/windows.html


1. add mingw64 bin path to Env Path

Go to the directory tools\build\.
Run bootstrap.bat
Run b2 install --prefix=PREFIX where PREFIX is the directory where you want Boost.Build to be installed
Add PREFIX\bin to your PATH environment variable.

windows mingw64
.\b2.exe -j8 --build-dir=.\tmp --build-type=complete threading=multi link=shared address-model=64 toolset=gcc stage