Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: NXT (user goal)
rejecting: NXT-0.2.3, 0.2.2, 0.2.1, 0.2.0, 0.1.8, 0.1.6, 0.1.5, 0.1.4 (global
constraint requires ==0.1.3)
trying: NXT-0.1.3
trying: base-4.8.1.0/installed-4f7... (dependency of NXT-0.1.3)
next goal: mtl (dependency of NXT-0.1.3)
rejecting: mtl-2.2.1, 2.2.0.1, 2.2, 2.1.3.1, 2.1.2, 2.1.1, 2.1, 2.0.1.1,
2.0.1.0, 2.0.0.0 (conflict: NXT => mtl>=1.1 && <2)
rejecting: mtl-1.1.1.1, 1.1.1.0 (conflict: base==4.8.1.0/installed-4f7..., mtl
=> base<4.6)
rejecting: mtl-1.1.0.2, 1.1.0.1, 1.1.0.0 (conflict:
base==4.8.1.0/installed-4f7..., mtl => base<4.3)
rejecting: mtl-1.0 (conflict: NXT => mtl>=1.1 && <2)
Dependency tree exhaustively searched.