anchor.diff:        # the `cabal` binary available. To do this, you should have
         # `haskellPackages.cabal-install` installed either on your system, or
         # through nix-env.
  -      auca = self.callPackage ./haskell/auca.nix {};
  +      auca = self.callPackage ./haskell/auca.nix { };
         #inky = self.callPackage ./haskell/inky.nix {};
  -      nox = self.callPackage ./haskell/nox.nix {};
  +      nox = self.callPackage ./haskell/nox.nix { };
       };
     };
   
  
positive.code:     url = "/home/l/prog/foreign/nixpkgs";
      ref = "refs/heads/nixpkgs-unstable";
      # Known good commit for moving branch "nixpkgs-unstable".
      rev = "2c0f6135aab77ff942b615228882c7dd996e0882";
    }) {};
  in
  {super}:
  # The `with` keyword in `with X; Y` adds the attributes of X to the scope
  # while evaluating Y. This way, we can just write `buildEnv` instead of
  # `pkgs.buildEnv`.
  
negative.code:   # https://github.com/jagajaga/my_configs/blob/master/.nixpkgs/common.nix.
    setPrio = prio: drv: lib.addMetaAttrs { priority = prio; } drv;
  
    l_emacs = pkgs.emacsWithPackages (with pkgs.emacsPackagesNg; [ vterm ]);
  
    l_set_basic = setPrio "10" (buildEnv {
      name = "l-set-basic";
      ignoreCollisions = true;
      paths = [ l_set_base l_set_dev l_set_haskell ];
    });
  
    # Meant for headless backup boxes. Subset of things in l-set-base and
  