FIND_LIBRARY_USE_LIB64_PATHS

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.

See also the CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX variable.