Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: clash-ghc (user goal)
rejecting: clash-ghc-0.6.24, clash-ghc-0.6.23, clash-ghc-0.6.22,
clash-ghc-0.6.21, clash-ghc-0.6.20, clash-ghc-0.6.19, clash-ghc-0.6.18
(constraint from user target requires ==0.6.17)
trying: clash-ghc-0.6.17
next goal: ghc (dependency of clash-ghc-0.6.17)
rejecting: ghc-8.0.1.20161018/installed-8.0... (conflict: clash-ghc =>
ghc>=7.10.1 && <7.12)
Dependency tree exhaustively searched.