anchor.diff:    ];
   
     nix = {
  -    useSandbox = false;
  -    trustedUsers = [ "root" "@admin" ];
  +    settings = {
  +      sandbox = false;
  +      trusted-users = [ "root" "@admin" ];
   
  -    inherit binaryCaches;
  -    trustedBinaryCaches = binaryCaches;
  -    binaryCachePublicKeys = [
  -      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
  -      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
  -      "milogert.cachix.org-1:MaZAAWJXDV85HpLm2yyLX9b52wQghRxljAZJg0dEjkY="
  -    ];
  +      inherit substituters;
  +      trusted-substituters = substituters;
  +      trusted-public-keys = [
  +        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
  +        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
  +        "milogert.cachix.org-1:MaZAAWJXDV85HpLm2yyLX9b52wQghRxljAZJg0dEjkY="
  +      ];
  +    };
   
       # Garbage collection.
       gc.automatic = false;
  
positive.code: 
    environment.pathsToLink = [ "/share/zsh" ];
  
    environment.shellAliases = {
      adj = "echo ADJACENT";
    };
    environment.systemPackages = with pkgs;
    let
      my-python-packages = python-packages: with python-packages; [
        pip
        #virutalenv
      ];
      python-with-packages = python38.withPackages my-python-packages;
    in [
      bash
      bash-completion
      bat # Need this for aliases.
      cachix
      cargo
      # Why do I have this?
      coreutils
      ctop
      diskonaut
      exa
  
negative.code: { pkgs, ... }:
  
  let
    substituters = [
      "https://cache.nixos.org"
      "https://nix-community.cachix.org"
      "https://milogert.cachix.org"
  