Resolving dependencies...
Downloading vowpal-utils-0.1...
Configuring vowpal-utils-0.1...
Building vowpal-utils-0.1...
Preprocessing library vowpal-utils-0.1...

Data/Digest/VowpalHash.lhs:27:18:
    Could not find module `Data.ByteString.UTF8'
    Perhaps you meant
      Data.ByteString.Char8 (needs flag -package bytestring-0.10.0.2)
      Data.ByteString.Lazy (needs flag -package bytestring-0.10.0.2)
      Data.ByteString (needs flag -package bytestring-0.10.0.2)
    Use -v to see a list of the files searched for.
Failed to install vowpal-utils-0.1
cabal: Error: some packages failed to install:
vowpal-utils-0.1 failed during the building phase. The exception was:
ExitFailure 1