Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: zeromq4-haskell (user goal)
rejecting: zeromq4-haskell-0.6.3, 0.6.2, 0.6.1, 0.6 (global constraint
requires ==0.5.1)
trying: zeromq4-haskell-0.5.1
trying: transformers-0.4.2.0/installed-21d... (dependency of
zeromq4-haskell-0.5.1)
next goal: exceptions (dependency of zeromq4-haskell-0.5.1)
rejecting: exceptions-0.8.0.2, 0.8.0.1, 0.8, 0.7, 0.6.1, 0.6 (conflict:
zeromq4-haskell => exceptions>=0.4 && <0.6)
rejecting: exceptions-0.5, 0.4 (conflict:
transformers==0.4.2.0/installed-21d..., exceptions => transformers>=0.2 &&
<0.4)
rejecting: exceptions-0.3.3.1, 0.3.3, 0.3.2, 0.3.1, 0.3, 0.2, 0.1.1, 0.1.0.1,
0.1 (conflict: zeromq4-haskell => exceptions>=0.4 && <0.6)
Dependency tree exhaustively searched.