Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happstack-ixset (user goal)
rejecting: happstack-ixset-6.0.1, 6.0.0, 0.5.0.3, 0.5.0.2, 0.5.0.1 (global
constraint requires ==0.5.0)
trying: happstack-ixset-0.5.0
trying: base-4.8.1.0/installed-4f7... (dependency of happstack-ixset-0.5.0)
next goal: happstack-util (dependency of happstack-ixset-0.5.0)
rejecting: happstack-util-6.0.3, 6.0.2, 6.0.0 (conflict: happstack-ixset =>
happstack-util>=0.5 && <0.6)
rejecting: happstack-util-0.5.0.3 (conflict: mtl==2.2.1, happstack-util =>
mtl>=1.1 && <2.1)
trying: happstack-util-0.5.0.2
next goal: strict-concurrency (dependency of happstack-util-0.5.0.2)
rejecting: strict-concurrency-0.2.4.1, 0.2.4 (conflict:
base==4.8.1.0/installed-4f7..., strict-concurrency => base>=4 && <4.6)
rejecting: strict-concurrency-0.2.3 (conflict: base==4.8.1.0/installed-4f7...,
strict-concurrency => base>=3 && <4.3)
rejecting: strict-concurrency-0.2.2, 0.2.1 (conflict:
base==4.8.1.0/installed-4f7..., strict-concurrency => base>=3 && <4)
rejecting: strict-concurrency-0.2, 0.1 (conflict:
base==4.8.1.0/installed-4f7..., strict-concurrency => base<4.3)
Dependency tree exhaustively searched.