Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: base-prelude (dependency of laika-0.1.3.1)
rejecting: base-prelude-1.0.1.1, base-prelude-1.0.1, base-prelude-1,
base-prelude-0.2 (conflict: laika => base-prelude>=0.1 && <0.2)
trying: base-prelude-0.1.21
next goal: base (dependency of base-prelude-0.1.21)
rejecting: base-4.9.0.0/installed-4.9... (conflict: base-prelude => base>=4.6
&& <4.9)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.