Improve error handling in Mac OS X installer
Improve error handling in Mac OS X installer

kfiz/IHaskell,sumitsahrawat/IHaskell,thomasjm/IHaskell,thomasjm/IHaskell,franklx/IHaskell,kfiz/IHaskell,franklx/IHaskell,sumitsahrawat/IHaskell,franklx/IHaskell,gibiansky/IHaskell,thomasjm/IHaskell,thomasjm/IHaskell,kfiz/IHaskell,gibiansky/IHaskell,franklx/IHaskell,sumitsahrawat/IHaskell,gibiansky/IHaskell,kfiz/IHaskell