Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: n2o-protocols (user goal)
[__0] rejecting: n2o-protocols-0.11.2 (constraint from user target requires
==0.11.0)
[__0] trying: n2o-protocols-0.11.0
[__1] next goal: nitro (dependency of n2o-protocols)
[__1] rejecting: nitro-0.2.2.5 (conflict: n2o-protocols => nitro==0.11.0)
[__1] skipping: nitro-0.2.2.4, nitro-0.2.2.3, nitro-0.2.2.2, nitro-0.2.2.1,
nitro-0.2.2.0, nitro-0.2.0.0, nitro-0.1.0.0 (has the same characteristics that
caused the previous version to fail: excluded by constraint '==0.11.0' from
'n2o-protocols')
[__1] fail (backjumping, conflict set: n2o-protocols, nitro)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: n2o-protocols, nitro