Try installing IHaskell with `stack`. `stack` is fairly new but it's solved all my `cabal` hell related problems. I put IHaskell in Stackage recently so you should just need to install stack, `stack install ihaskell` using a recent Stackage nightly resolver, and then `stack exec -- jupyter notebook` to start. Alternatively just `git clone` and run `stack install` from the resulting directory. If you end up trying it again but still encounter issues please file issues for me on Github so I can help!