Resolving dependencies... Downloading hinvaders-0.1... Configuring hinvaders-0.1... Building hinvaders-0.1... Preprocessing executable 'hinvaders' for hinvaders-0.1... src/Main.hs:1:1: Ambiguous module name `Prelude': it was found in multiple packages: base haskell98-2.0.0.2 Failed to install hinvaders-0.1 cabal: Error: some packages failed to install: hinvaders-0.1 failed during the building phase. The exception was: ExitFailure 1