Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: cachix (user goal)
[__0] rejecting: cachix-0.6.0 (conflict: pkg-config package nix-main==2.0 ||
>2.0, not found in the pkg-config database)
[__0] rejecting: cachix-0.5.1, cachix-0.5.0, cachix-0.3.8, cachix-0.3.7,
cachix-0.3.6, 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 ==0.6.0)
[__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