Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: buildwrapper (user goal)
rejecting: buildwrapper-0.9.1, buildwrapper-0.9.0, buildwrapper-0.8.11,
buildwrapper-0.8.10, buildwrapper-0.8.9, buildwrapper-0.8.8,
buildwrapper-0.8.7, buildwrapper-0.8.6, buildwrapper-0.8.5,
buildwrapper-0.8.4, buildwrapper-0.8.3, buildwrapper-0.8.2,
buildwrapper-0.8.1, buildwrapper-0.8.0, buildwrapper-0.7.7,
buildwrapper-0.7.6, buildwrapper-0.7.5, buildwrapper-0.7.4,
buildwrapper-0.7.3, buildwrapper-0.7.2, buildwrapper-0.7.1,
buildwrapper-0.7.0, buildwrapper-0.6.4, buildwrapper-0.6.3,
buildwrapper-0.6.2, buildwrapper-0.6.1, buildwrapper-0.6.0,
buildwrapper-0.5.2, buildwrapper-0.5.1, buildwrapper-0.5.0,
buildwrapper-0.4.1, buildwrapper-0.4.0, buildwrapper-0.3.0, buildwrapper-0.2.2
(constraint from user target requires ==0.2.1)
trying: buildwrapper-0.2.1
trying: base-4.9.0.0/installed-4.9... (dependency of buildwrapper-0.2.1)
next goal: aeson-native (dependency of buildwrapper-0.2.1)
rejecting: aeson-native-0.3.3.2, aeson-native-0.3.3.1, aeson-native-0.3.3
(conflict: base==4.9.0.0/installed-4.9..., aeson-native => base>=4 && <4.4)
Dependency tree exhaustively searched.