Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: unix-compat (user goal)
rejecting: unix-compat-0.4.1.4, 0.4.1.3, 0.4.1.1, 0.4.1.0, 0.4.0.0, 0.3.0.2,
0.3.0.1, 0.3, 0.2.2.1, 0.2.2, 0.2.1.3 (global constraint requires ==0.2.1.2)
trying: unix-compat-0.2.1.2
trying: base-4.7.0.1/installed-e4b... (dependency of unix-compat-0.2.1.2)
trying: unix-compat-0.2.1.2:-portable
next goal: unix (dependency of unix-compat-0.2.1.2:-portable)
rejecting: unix-2.7.0.1/installed-0d8..., 2.7.1.0, 2.7.0.1, 2.7.0.0, 2.6.0.1,
2.6.0.0, 2.5.1.1, 2.5.1.0, 2.5.0.0 (conflict: unix-compat-0.2.1.2:portable =>
unix==2.4.*)
rejecting: unix-2.4.2.0, 2.4.1.0 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.4)
rejecting: unix-2.4.0.2, 2.4.0.1 (conflict: base==4.7.0.1/installed-e4b...,
unix => base>=4.2 && <4.3)
rejecting: unix-2.4.0.0 (conflict: base==4.7.0.1/installed-e4b..., unix =>
base>=4.1 && <4.3)
rejecting: unix-2.3.2.0, 2.3.1.0, 2.3.0.0, 2.2.0.0, 2.0 (conflict:
unix-compat-0.2.1.2:portable => unix==2.4.*)
Dependency tree exhaustively searched.