New in version 3.9.
Whether the find_library() command should automatically search libx32 directories.
FIND_LIBRARY_USE_LIBX32_PATHS is a boolean specifying whether the find_library() command should automatically search the libx32 variant of directories called lib in the search path when building x32-abi binaries.
See also the CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX variable.
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https://cmake.org/cmake/help/v3.19/prop_gbl/FIND_LIBRARY_USE_LIBX32_PATHS.html