Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hackport (user goal)
rejecting: hackport-0.5.1, hackport-0.5, hackport-0.4.7, hackport-0.4.6,
hackport-0.4.5, hackport-0.4.4, hackport-0.4.3, hackport-0.4.2, hackport-0.4.1
(constraint from user target requires ==0.4)
trying: hackport-0.4
trying: unix-2.7.2.0/installed-2.7... (dependency of hackport-0.4)
next goal: bytestring (dependency of unix-2.7.2.0/installed-2.7...)
rejecting: bytestring-0.10.8.1/installed-0.1... (conflict: bytestring =>
deepseq==1.4.2.0/installed-1.4..., hackport => deepseq>=1.3 && <1.4)
rejecting: bytestring-0.10.8.1, bytestring-0.10.8.0, bytestring-0.10.6.0,
bytestring-0.10.4.1, bytestring-0.10.4.0, bytestring-0.10.2.0,
bytestring-0.10.0.2, bytestring-0.10.0.1, bytestring-0.10.0.0,
bytestring-0.9.2.1, bytestring-0.9.2.0, bytestring-0.9.1.10,
bytestring-0.9.1.9, bytestring-0.9.1.8, bytestring-0.9.1.7,
bytestring-0.9.1.6, bytestring-0.9.1.5, bytestring-0.9.1.4,
bytestring-0.9.1.3, bytestring-0.9.1.2, bytestring-0.9.1.1,
bytestring-0.9.1.0, bytestring-0.9.0.4, bytestring-0.9.0.3,
bytestring-0.9.0.2, bytestring-0.9.0.1, bytestring-0.9 (conflict: unix =>
bytestring==0.10.8.1/installed-0.1...)
Dependency tree exhaustively searched.