Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: zeromq3-haskell (user goal)
rejecting: zeromq3-haskell-0.5.2 (conflict: requires pkg-config package
libzmq>=3.2 && <4.0, not found in the pkg-config database)
rejecting: zeromq3-haskell-0.5.1, zeromq3-haskell-0.5, zeromq3-haskell-0.4,
zeromq3-haskell-0.3.1, zeromq3-haskell-0.3.0, zeromq3-haskell-0.2,
zeromq3-haskell-0.1.4, zeromq3-haskell-0.1.3, zeromq3-haskell-0.1.2,
zeromq3-haskell-0.1.1, zeromq3-haskell-0.1 (constraint from user target
requires ==0.5.2)
Dependency tree exhaustively searched.