Resolving dependencies... cabal: Could not resolve dependencies: next goal: scion-browser (user goal) rejecting: scion-browser-0.5.0, scion-browser-0.4.3, scion-browser-0.4.2, scion-browser-0.4.1, scion-browser-0.4.0, scion-browser-0.3.5, scion-browser-0.3.4, scion-browser-0.3.3, scion-browser-0.3.2, scion-browser-0.3.1, scion-browser-0.3.0, scion-browser-0.2.19, scion-browser-0.2.18, scion-browser-0.2.17, scion-browser-0.2.16, scion-browser-0.2.15, scion-browser-0.2.14, scion-browser-0.2.13, scion-browser-0.2.12, scion-browser-0.2.11, scion-browser-0.2.10, scion-browser-0.2.9, scion-browser-0.2.8, scion-browser-0.2.7, scion-browser-0.2.6, scion-browser-0.2.5, scion-browser-0.2.3, scion-browser-0.2.2 (constraint from user target requires ==0.2.1) trying: scion-browser-0.2.1 next goal: ghc (dependency of scion-browser-0.2.1) rejecting: ghc-8.0.1.20161018/installed-8.0... (conflict: ghc => containers==0.5.7.1/installed-0.5..., scion-browser => containers>=0.2 && <0.5) Dependency tree exhaustively searched.