Unix Makefiles).
Possible generators include:
The build tool chosen by CMake — corresponding to the generator —
is exposed in the
CMAKE_BUILD_TOOL build environment variable.
Subsequent build steps may use $CMAKE_BUILD_TOOL
to execute the generated scripts.
Its actual value is retrieved from the generated CMake cache file
(CMakeCache.txt). Usually that value is something like
/usr/bin/gmake on Linux.