dlukesmacbookpro:~ dlukes$ cabal install enummap
Resolving dependencies...
Configuring containers-0.2.0.1...
Preprocessing library containers-0.2.0.1...
Building containers-0.2.0.1...

Data/IntMap.hs:182:7:
    Could not find module `Data.Data':
      It is a member of the hidden package `base'.
      Perhaps you need to add `base' to the build-depends in your .cabal file.
      Use -v to see a list of the files searched for.
cabal: Error: some packages failed to install:
EnumMap-0.0.2 depends on containers-0.2.0.1 which failed to install.
containers-0.2.0.1 failed during the building phase. The exception was:
ExitFailure 1
dlukesmacbookpro:~ dlukes$