Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: HGL (user goal)
rejecting: HGL-3.2.0.5, 3.2.0.4, 3.2.0.2 (global constraint requires
==3.2.0.1)
trying: HGL-3.2.0.1
trying: base-4.8.1.0/installed-4f7... (dependency of HGL-3.2.0.1)
rejecting: HGL-3.2.0.1:+split-base (conflict: base==4.8.1.0/installed-4f7...,
HGL-3.2.0.1:split-base => base>=3 && <4)
rejecting: HGL-3.2.0.1:-split-base (conflict: base==4.8.1.0/installed-4f7...,
HGL-3.2.0.1:split-base => base<2)
Dependency tree exhaustively searched.