Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: ipython-kernel-0.9.1.0 (user goal)
[__1] next goal: zeromq4-haskell (dependency of ipython-kernel)
[__1] 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 (conflict: pkg-config package
libzmq>=4.0 && <5.0, not found in the pkg-config database)
[__1] trying: zeromq4-haskell-0.2
[__2] next goal: async (dependency of zeromq4-haskell)
[__2] rejecting: async-2.2.1, async-2.1.1.1, async-2.1.1, async-2.1.0
(conflict: zeromq4-haskell => async==2.0.*)
[__2] trying: async-2.0.2
[__3] next goal: base (dependency of ipython-kernel)
[__3] rejecting: base-4.11.1.0/installed-4.1... (conflict: async => base>=4.3
&& <4.9)
[__3] rejecting: base-4.11.1.0, base-4.11.0.0, base-4.10.1.0, base-4.10.0.0,
base-4.9.1.0, base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, async, zeromq4-haskell,
ipython-kernel