Build #2 for zeromq4-haskell-0.8.0

[all reports]

Package zeromq4-haskell-0.8.0
Install PlanningFailed
Docs NotTried
Tests NotTried
Time submitted 2019-03-03 15:55:43.171501557 UTC
Compiler ghc-8.6.3
OS linux
Arch x86_64
Dependencies
Flags none

Build log

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Warning: The install command is a part of the legacy v1 style of cabal usage.

Please switch to using either the new project style and the new-install
command or the legacy v1-install alias as new-style projects will become the
default in the next version of cabal-install. Please file a bug if you cannot
replicate a working v1- use case with the new-style commands.

For more information, see: https://wiki.haskell.org/Cabal/NewBuild

Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: zeromq4-haskell (user goal)
[__0] rejecting: zeromq4-haskell-0.8.0 (conflict: pkg-config package
libzmq>=4.0 && <5.0, not found in the pkg-config database)
[__0] rejecting: zeromq4-haskell-0.7.0, zeromq4-haskell-0.6.7,
zeromq4-haskell-0.6.6, zeromq4-haskell-0.6.5, zeromq4-haskell-0.6.4,
zeromq4-haskell-0.6.3, zeromq4-haskell-0.6.2, zeromq4-haskell-0.6.1,
zeromq4-haskell-0.6, zeromq4-haskell-0.5.1, zeromq4-haskell-0.5,
zeromq4-haskell-0.4.1, zeromq4-haskell-0.4, zeromq4-haskell-0.3.2,
zeromq4-haskell-0.3.1, zeromq4-haskell-0.3, zeromq4-haskell-0.2,
zeromq4-haskell-0.1 (constraint from user target requires ==0.8.0)
[__0] fail (backjumping, conflict set: zeromq4-haskell)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: zeromq4-haskell