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] next goal: cachix (user goal)
[__0] rejecting: cachix-0.3.6 (conflict: pkg-config package nix-main==2.0 ||
>2.0, not found in the pkg-config database)
[__0] rejecting: cachix-0.3.5, cachix-0.3.4, cachix-0.3.3, cachix-0.3.2,
cachix-0.3.1, cachix-0.3.0, cachix-0.2.1, cachix-0.2.0, cachix-0.1.3,
cachix-0.1.2, cachix-0.1.1, cachix-0.1.0.2, cachix-0.1.0.1, cachix-0.1.0.0
(constraint from user target requires ==0.3.6)
[__0] fail (backjumping, conflict set: cachix)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: cachix