Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: acme-everything (user goal)
rejecting: acme-everything-2015.5.4.1 (global constraint requires ==2015.5.4)
trying: acme-everything-2015.5.4
trying: base-4.8.1.0/installed-4f7... (dependency of acme-everything-2015.5.4)
trying: twentefp-eventloop-trees-0.1.1.0 (dependency of
acme-everything-2015.5.4)
next goal: eventloop (dependency of twentefp-eventloop-trees-0.1.1.0)
rejecting: eventloop-0.4.1.1, 0.4.1.0, 0.4.0.0 (conflict:
base==4.8.1.0/installed-4f7..., eventloop => base>=4.7 && <4.8)
rejecting: eventloop-0.3.0.0, 0.2.1.2, 0.2.1.1 (conflict:
twentefp-eventloop-trees => eventloop>=0.4.0.0 && <0.5.0.0)
Dependency tree exhaustively searched.