Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: clash (user goal)
rejecting: clash-0.1.3.11, 0.1.3.9, 0.1.3.0, 0.1.2.5 (global constraint
requires ==0.1.2.4)
trying: clash-0.1.2.4
next goal: ghc (dependency of clash-0.1.2.4)
rejecting: ghc-7.8.3/installed-4df... (conflict: clash => ghc>=6.12 && <6.13)
Dependency tree exhaustively searched.