[CMake] Determine the directory to install package config and version files (like /usr/lib/cmake)

[Daniel Wyatt]

Is there a way to determine this directory?

Right now I have something like:
${CMAKE_INSTALL_LIBDIR}/cmake/<project-name>/something-version.cmake

On CentOS 7 w/cmake3, however, this should be /usr/lib/cmake3/...

Obviously I can just check to see if this directory exists and then fall
back,
but I'm wondering if there is a bultin variable to retrieve this (I've
looked, but no luck so far).
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