CMake´s buildscript generator to use (e.g. Unix Makefiles). Leave empty to let CMake choose a generator.
Possible generators include:

HINT: This field does not require quotes if the generator name contains spaces.

The build tool corresponding to the specified script generator is exposed in the CMAKE_BUILD_TOOL build variable, except for the Visual Studio and Xcode generators (the actual value of CMAKE_BUILD_TOOL is retrieved from the generated CMake cache file, but these generators do not set CMAKE_MAKE_PROGRAM at buildscript generation time).