Configuring zeromq4-haskell-0.6.3...
Dependency async ==2.0.2: using async-2.0.2
Dependency base ==4.8.1.0: using base-4.8.1.0
Dependency bytestring ==0.10.6.0: using bytestring-0.10.6.0
Dependency containers ==0.5.6.2: using containers-0.5.6.2
Dependency exceptions ==0.8.0.2: using exceptions-0.8.0.2
Dependency semigroups ==0.16.2.2: using semigroups-0.16.2.2
Dependency transformers ==0.4.2.0: using transformers-0.4.2.0
setup-Simple-Cabal-1.22.4.0-x86_64-linux-ghc-7.10.2: The pkg-config package
'libzmq' version >=4.0 && <5.0 is required but it could not be found.