{ pkgs, ... }:
{
  nixpkgs.overlays = [
    (final: prev: {
      nix-update = prev.nix-update.overrideAttrs (oldAttrs: {
        patches = oldAttrs.patches or [ ] ++ [ ./source-attribute.patch ];
      });
    })
  ];

  environment.systemPackages = with pkgs; [ nix-update ];
}