Resolving dependencies...
cabal: Could not resolve dependencies:
trying: ghc-exactprint-0.3.1.1 (user goal)
next goal: ghc (dependency of ghc-exactprint-0.3.1.1)
rejecting: ghc-7.8.3/installed-0af... (conflict: ghc-exactprint =>
ghc>=7.10.2)
Dependency tree exhaustively searched.