Resolving dependencies...
Downloading Ebnf2ps-1.0.9...
Configuring Ebnf2ps-1.0.9...
Building Ebnf2ps-1.0.9...
Preprocessing executable 'ebnf2ps' for Ebnf2ps-1.0.9...

src/Ebnf2ps.hs:1:1:
    Ambiguous module name `Prelude':
      it was found in multiple packages: base haskell98-2.0.0.2
Failed to install Ebnf2ps-1.0.9
cabal: Error: some packages failed to install:
Ebnf2ps-1.0.9 failed during the building phase. The exception was:
ExitFailure 1