CMAKE_CACHE_PATCH_VERSION
Patch version of CMake used to create the CMakeCache.txt file
This stores the patch version of CMake used to write a CMake cache file. It is only different when a different version of CMake is run on a previously created cache file.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/variable/CMAKE_CACHE_PATCH_VERSION.html
