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Xcode 8.1 added timingsafe_bcmp to string.h and libsystem_c.tbd, and 10.12.1 added it to libsystem_c.dylib, but it is not present in libsystem_c.dylib on 10.11.6 (15G1108). It may appear in libsystem_c.dylib in a later 10.11 release or it may be marked weak on 10.11 in a later Xcode release. Fixes Homebrew/homebrew-core#6344.