_final: prev: {
  koreader-kobo = prev.callPackage ../pkgs/kobo.nix;
  koreader-pocketbook = prev.callPackage ../pkgs/pocketbook.nix;
  koreader-plugins = prev.callPackage ../pkgs/plugins.nix;
  koreader-patches = prev.callPackage ../pkgs/patches.nix;
}