Resolving dependencies...
Downloading alex-2.1.0...

/tmp/alex-2.1.0-1257/alex-2.1.0/Setup.lhs:7:8:
    Could not find module `Distribution.Setup'
    Perhaps you meant
      Distribution.ReadE (from Cabal-1.16.0.3)
      Distribution.System (from Cabal-1.16.0.3)
      Distribution.Text (from Cabal-1.16.0.3)
    Use -v to see a list of the files searched for.
Failed to install alex-2.1.0
cabal: Error: some packages failed to install:
alex-2.1.0 failed during the configure step. The exception was:
ExitFailure 1