Whether find_library() should automatically search lib64 directories.
FIND_LIBRARY_USE_LIB64_PATHS is a boolean specifying whether the find_library() command should automatically search the lib64 variant of directories called lib in the search path when building 64-bit binaries.
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https://cmake.org/cmake/help/v3.6/prop_gbl/FIND_LIBRARY_USE_LIB64_PATHS.html