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] trying: clckwrks-cli-0.2.17.1 (user goal) [__1] trying: haskeline-0.7.4.3/installed-0.7... (dependency of clckwrks-cli) [__2] trying: stm-2.5.0.0/installed-2.5... (dependency of haskeline) [__3] next goal: clckwrks (dependency of clckwrks-cli) [__3] rejecting: clckwrks-0.24.0.8 (conflict: haskeline => stm==2.5.0.0/installed-2.5..., clckwrks => stm>=2.2 && <2.5) [__3] rejecting: clckwrks-0.24.0.7, clckwrks-0.24.0.6, clckwrks-0.24.0.4, clckwrks-0.24.0.3, clckwrks-0.24.0.2, clckwrks-0.24.0.1, clckwrks-0.24.0, clckwrks-0.23.19.2, clckwrks-0.23.19.1, clckwrks-0.23.18, clckwrks-0.23.16, clckwrks-0.23.15, clckwrks-0.23.14, clckwrks-0.23.13, clckwrks-0.23.12, clckwrks-0.23.11, clckwrks-0.23.10, clckwrks-0.23.9, clckwrks-0.23.8, clckwrks-0.23.7 (conflict: haskeline => containers==0.6.0.1/installed-0.6..., clckwrks => containers>=0.4 && <0.6) [__3] rejecting: clckwrks-0.22.4, clckwrks-0.22.3, clckwrks-0.22.2, clckwrks-0.22.1, clckwrks-0.22.0, clckwrks-0.21.1, clckwrks-0.21.0, clckwrks-0.20.2, clckwrks-0.20.1, clckwrks-0.20.0, clckwrks-0.19.3, clckwrks-0.19.2, clckwrks-0.19.1, clckwrks-0.19.0, clckwrks-0.18.3, clckwrks-0.18.2, clckwrks-0.18.1, clckwrks-0.18.0, clckwrks-0.16.2, clckwrks-0.14.2, clckwrks-0.13.2, clckwrks-0.13.0 (conflict: clckwrks-cli => clckwrks>=0.23 && <0.25) [__3] rejecting: clckwrks-0.23.19, clckwrks-0.23.17 (conflict: haskeline => containers==0.6.0.1/installed-0.6..., clckwrks => containers>=0.4 && <0.6) [__3] fail (backjumping, conflict set: clckwrks, clckwrks-cli, haskeline) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: base, userid, clckwrks-cli, clckwrks, haskeline, stm