[  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’