Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: c2hs (user goal)
rejecting: c2hs-0.27.1, 0.26.2, 0.26.1, 0.25.2, 0.25.1, 0.24.1, 0.23.1,
0.22.1, 0.21.1, 0.20.1, 0.19.1, 0.18.2, 0.18.1 (global constraint requires
==0.17.2)
trying: c2hs-0.17.2
next goal: base (dependency of c2hs-0.17.2)
rejecting: base-4.8.1.0/installed-4f7... (conflict: c2hs => base>=2 && <4.8)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.