Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: jack (user goal)
rejecting: jack-0.7.0.3, 0.7.0.2 (global constraint requires ==0.7.0.1)
trying: jack-0.7.0.1
trying: base-4.8.1.0/installed-4f7... (dependency of jack-0.7.0.1)
next goal: unix (dependency of jack-0.7.0.1)
rejecting: unix-2.7.1.0/installed-643..., 2.7.1.0, 2.7.0.1, 2.7.0.0 (conflict:
jack => unix>=2.3 && <2.7)
rejecting: unix-2.6.0.1, 2.6.0.0 (conflict: base==4.8.1.0/installed-4f7...,
unix => base>=4.5 && <4.7)
rejecting: unix-2.5.1.1, 2.5.1.0 (conflict: base==4.8.1.0/installed-4f7...,
unix => base>=4.5 && <4.6)
rejecting: unix-2.5.0.0 (conflict: base==4.8.1.0/installed-4f7..., unix =>
base>=4.2 && <4.5)
rejecting: unix-2.4.2.0, 2.4.1.0 (conflict: base==4.8.1.0/installed-4f7...,
unix => base>=4.2 && <4.4)
rejecting: unix-2.4.0.2, 2.4.0.1 (conflict: base==4.8.1.0/installed-4f7...,
unix => base>=4.2 && <4.3)
rejecting: unix-2.4.0.0 (conflict: base==4.8.1.0/installed-4f7..., unix =>
base>=4.1 && <4.3)
rejecting: unix-2.3.2.0, 2.3.1.0, 2.3.0.0 (conflict:
base==4.8.1.0/installed-4f7..., unix => base<4.3)
rejecting: unix-2.2.0.0, 2.0 (conflict: jack => unix>=2.3 && <2.7)
Dependency tree exhaustively searched.