Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: opt-env-conf-0.4.0.0 (user goal)
[__1] unknown package: autodocodec-nix (dependency of opt-env-conf)
[__1] fail (backjumping, conflict set: autodocodec-nix, opt-env-conf)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: opt-env-conf, autodocodec-nix