Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: ucl (user goal)
[__0] rejecting: ucl-0.1.0.0 (conflict: pkg-config package libucl-any, not
found in the pkg-config database)
[__0] fail (backjumping, conflict set: ucl)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: ucl