anchor.diff:  #
   # Based on https://github.com/nmattia/homies/blob/master/default.nix
   let
  -
  -  pkgs = pkgs-darwin;
   
     pkgs-darwin = import (builtins.fetchTarball {
       # Descriptive name to make the store path easier to identify
  
positive.code:     rev = "7448efeddfa7ac44dceffbb43f70cb5d5ecb7385"; # pinned to 02/12/2020
    });
  
    hub = pkgs.gitAndTools.hub;
  
    custom = rec {
  
negative.code:     zshrc = callPackage ./zshrc {};
      geometry-zsh = callPackage ./zshrc/geometry-zsh.nix {};
      dircolors-solarized = callPackage ./zshrc/dircolors-solarized.nix {};
      metals = callPackage ./metals {};
      fzf = callPackage ./fzf {};
  
      # Convert 'yarn.lock' files into Nix expressions
      yarn2nix = callPackage (pkgs.fetchFromGitHub {
        owner = "moretea";
        repo = "yarn2nix";
        rev = "3cc020e384ce2a439813adb7a0cc772a034d90bb";
  