anchor.diff:        pkgs.nix
         pkgs.nix-zsh-completions
         pkgs.openjdk
  -      pkgs.pinentry
  +      pinentry
         pkgs.tree
         pkgs.zsh-completions
       ];
  
positive.code:     };
    };
  
    allPlatforms = with custom;
      [
        # Customized packages
  
negative.code:   # use a pinned version of nixpkgs for reproducability
    pkgs = import (builtins.fetchTarball {
      # Descriptive name to make the store path easier to identify
      name = "nixpkgs-19.03-2019-05-17";
      # rev obtained with `git ls-remote https://github.com/nixos/nixpkgs-channels nixpkgs-19.03-darwin`
      url = "https://github.com/nixos/nixpkgs/archive/c86f09d2d939f0f6993447117f841f19242500c2.tar.gz";
      # hash obtained with `nix-prefetch-url --unpack <url from above>`
      sha256 = "0fvxn8w368wg8d0lgbmrkr3ws1i1484hjrzsr65y4wldz0w9chrq";
    }) {};
  
    hub = pkgs.gitAndTools.hub;
  