Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: acme-everything (user goal)
rejecting: acme-everything-2015.5.4.1, 2015.5.4 (global constraint requires
==2015.4.15.1)
trying: acme-everything-2015.4.15.1
trying: zoom-0.1.0.1 (dependency of acme-everything-2015.4.15.1)
next goal: ghc (dependency of zoom-0.1.0.1)
rejecting: ghc-7.10.2/installed-a64... (conflict: zoom => ghc>=7.0.3 && <7.2)
Dependency tree exhaustively searched.