Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hermit (user goal)
rejecting: hermit-1.0.1, hermit-1.0.0.0, hermit-0.7.1.0, hermit-0.7.0.0,
hermit-0.6.0.0, hermit-0.5.0.0, hermit-0.4.0.0, hermit-0.3.2.0,
hermit-0.3.1.0, hermit-0.3.0.0, hermit-0.2.0.0, hermit-0.1.8.0 (constraint
from user target requires ==0.1.6.0)
trying: hermit-0.1.6.0
next goal: ghc (dependency of hermit-0.1.6.0)
rejecting: ghc-8.0.1.20161018/installed-8.0... (conflict: hermit =>
ghc==7.6.*)
Dependency tree exhaustively searched.