Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: buildwrapper (user goal)
rejecting: buildwrapper-0.9.1, 0.9.0, 0.8.11, 0.8.10, 0.8.9, 0.8.8, 0.8.7,
0.8.6, 0.8.5, 0.8.4, 0.8.3, 0.8.2, 0.8.1, 0.8.0, 0.7.7, 0.7.6, 0.7.5, 0.7.4,
0.7.3, 0.7.2, 0.7.1, 0.7.0, 0.6.4, 0.6.3, 0.6.2, 0.6.1, 0.6.0, 0.5.2, 0.5.1,
0.5.0, 0.4.1, 0.4.0, 0.3.0, 0.2.2 (global constraint requires ==0.2.1)
trying: buildwrapper-0.2.1
trying: base-4.8.1.0/installed-4f7... (dependency of buildwrapper-0.2.1)
next goal: aeson-native (dependency of buildwrapper-0.2.1)
rejecting: aeson-native-0.3.3.2, 0.3.3.1, 0.3.3 (conflict:
base==4.8.1.0/installed-4f7..., aeson-native => base>=4 && <4.4)
Dependency tree exhaustively searched.