Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: happlets-lib-gtk-0.1.0.0 (user goal)
[__1] next goal: base (dependency of happlets-lib-gtk)
[__1] rejecting: base-4.10.1.0/installed-4.1... (conflict: happlets-lib-gtk =>
base>=4.7 && <4.9)
[__1] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, 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)
[__1] fail (backjumping, conflict set: base, happlets-lib-gtk)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, happlets-lib-gtk