Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: pub (user goal)
rejecting: pub-2.0.2 (global constraint requires ==2.0.1)
trying: pub-2.0.1
trying: groom-0.1.2 (dependency of pub-2.0.1)
trying: haskell-src-exts-1.16.0.1 (dependency of groom-0.1.2)
trying: cpphs-1.19 (dependency of haskell-src-exts-1.16.0.1)
trying: directory-1.2.1.0/installed-4c4... (dependency of cpphs-1.19)
next goal: unix (dependency of directory-1.2.1.0/installed-4c4...)
rejecting: unix-2.7.0.1/installed-0d8... (conflict: unix =>
bytestring==0.10.4.0/installed-9f4..., pub => bytestring>=0.10.0.2 && <0.10.1)
rejecting: unix-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, 2.4.2.0, 2.4.1.0, 2.4.0.2, 2.4.0.1, 2.4.0.0, 2.3.2.0, 2.3.1.0,
2.3.0.0, 2.2.0.0, 2.0 (conflict: directory => unix==2.7.0.1/installed-0d8...)
Dependency tree exhaustively searched.