This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Specify the minimum version of macOS on which the target binaries are to be deployed.
The MACOSX_DEPLOYMENT_TARGET environment variable sets the default value for the CMAKE_OSX_DEPLOYMENT_TARGET variable.
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https://cmake.org/cmake/help/v3.15/envvar/MACOSX_DEPLOYMENT_TARGET.html