Resolving dependencies...
Downloading vowpal-utils-0.1...
Configuring vowpal-utils-0.1...
Building vowpal-utils-0.1...
Failed to install vowpal-utils-0.1
Build log ( /home/builder/.cabal/logs/vowpal-utils-0.1.log ):
cabal: Entering directory '/tmp/cabal-tmp-3464/vowpal-utils-0.1'
Configuring vowpal-utils-0.1...
Building vowpal-utils-0.1...
Preprocessing library vowpal-utils-0.1...
[1 of 1] Compiling Data.Digest.VowpalHash ( Data/Digest/VowpalHash.lhs, dist/build/Data/Digest/VowpalHash.o )

Data/Digest/VowpalHash.lhs:24:1: error:
    Failed to load interface for ‘Data.ByteString’
    It is a member of the hidden package ‘bytestring-0.10.8.1’.
    Perhaps you need to add ‘bytestring’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.

Data/Digest/VowpalHash.lhs:25:1: error:
    Failed to load interface for ‘Data.ByteString.Char8’
    It is a member of the hidden package ‘bytestring-0.10.8.1’.
    Perhaps you need to add ‘bytestring’ to the build-depends in your .cabal file.
    Use -v to see a list of the files searched for.

Data/Digest/VowpalHash.lhs:27:1: error:
    Failed to load interface for ‘Data.ByteString.UTF8’
    Perhaps you meant
      Data.ByteString.Char8 (needs flag -package-key bytestring-0.10.8.1)
      Data.ByteString.Lazy (needs flag -package-key bytestring-0.10.8.1)
      Data.ByteString (needs flag -package-key bytestring-0.10.8.1)
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-3464/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