[  9 of 561] Compiling Utility.QuickCheck ( Utility/QuickCheck.hs, dist/build/git-annex/git-annex-tmp/Utility/QuickCheck.dyn_o )

Utility/QuickCheck.hs:38:10: error:
    Duplicate instance declarations:
      instance Arbitrary EpochTime
        -- Defined at Utility/QuickCheck.hs:38:10
      instance [safe] Arbitrary Foreign.C.Types.CTime
        -- Defined in ‘Test.QuickCheck.Arbitrary’