{ inputs, ... }:
{
  # Additional package sets are accessible through `pkgs.<name>`.
  stable = final: _prev: {
    stable = import inputs.nixpkgs-stable {
      system = final.stdenv.hostPlatform.system;
      config.allowUnfree = true;
    };
  };

  master = final: _prev: {
    master = import inputs.nixpkgs-master {
      system = final.stdenv.hostPlatform.system;
      config.allowUnfree = true;
    };
  };

  # Baseline x86-64 (v1) packages for prebuilt applications that should not
  # inherit an x86-64-v3 host platform.
  x86-v1 = final: _prev: {
    x86-v1 = import inputs.nixpkgs {
      system = final.stdenv.hostPlatform.system;
      config.allowUnfree = true;
    };
  };

  patches = import ./patches;
}