let inherit (import <nixpkgs> {}) fetchFromGitHub; nixpkgs = fetchFromGitHub { owner = "NixOS"; repo = "nixpkgs-channels"; rev = "54f385241e6649128ba963c10314942d73245479"; sha256 = "0bd4v8v4xcdbaiaa59yqprnc6dkb9jv12mb0h5xz7b51687ygh9l"; }; in import nixpkgs