{ inputs, ...}: {
  # This one brings our custom packages from the 'pkgs' directory
  additions = final: prev: import ../pkgs final.pkgs;

  # This one contains whatever you want to overlay
  # You can change versions, add patches, set compilation flags, anything really.
  # https://nixos.wiki/wiki/Overlays
  modifications = final: prev: {
  };

  unstable-packages = final: _prev: {
    unstable = import inputs.nixpkgs-unstable {
      system = final.system;
      config.allowUnfree = false;
    };
  };
}