Resolving dependencies...
Downloading Yampa-0.9.1.1...
Configuring Yampa-0.9.1.1...
Building Yampa-0.9.1.1...
Preprocessing library Yampa-0.9.1.1...

src/AFRP.hs:1:1:
    Ambiguous module name `Prelude':
      it was found in multiple packages: base haskell98-2.0.0.2
Failed to install Yampa-0.9.1.1
cabal: Error: some packages failed to install:
Yampa-0.9.1.1 failed during the building phase. The exception was:
ExitFailure 1