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: SciFlow-0.7.0 (user goal) [__1] trying: stm-2.5.0.0/installed-2.5... (dependency of SciFlow) [__2] next goal: distributed-process (dependency of SciFlow) [__2] rejecting: distributed-process-0.7.4, distributed-process-0.7.3, distributed-process-0.7.2 (conflict: stm==2.5.0.0/installed-2.5..., distributed-process => stm>=2.4 && <2.5) [__2] rejecting: distributed-process-0.7.1 (conflict: stm => base==4.12.0.0/installed-4.1..., distributed-process => base>=4.6 && <4.10) [__2] rejecting: distributed-process-0.7.0 (conflict: stm==2.5.0.0/installed-2.5..., distributed-process => stm>=2.4 && <2.5) [__2] rejecting: distributed-process-0.6.6, distributed-process-0.6.5, distributed-process-0.6.4, distributed-process-0.6.2, distributed-process-0.6.1, distributed-process-0.6.0, distributed-process-0.5.5.1, distributed-process-0.5.5, distributed-process-0.5.4, distributed-process-0.5.3, distributed-process-0.5.2, distributed-process-0.5.1, distributed-process-0.5.0, distributed-process-0.4.2, distributed-process-0.4.1, distributed-process-0.4.0.2, distributed-process-0.4.0.1, distributed-process-0.4.0, distributed-process-0.3.1, distributed-process-0.3.0, distributed-process-0.2.3.0, distributed-process-0.2.2.0, distributed-process-0.2.1.4, distributed-process-0.2.1.3, distributed-process-0.2.1.2, distributed-process-0.2.1.1, distributed-process-0.2.1, distributed-process-0.2.0.1, distributed-process-0.2.0, distributed-process-0.6.3 (conflict: SciFlow => distributed-process==0.7.*) [__2] fail (backjumping, conflict set: SciFlow, distributed-process, stm) After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: distributed-process, SciFlow, base, stm