let
  nixpkgs = {
    url = "https://github.com/NixOS/nixpkgs/";
    ref = "nixos-21.05";
    rev = "d5b65f812cd4f5a8fa74b406075b59a46f1cfd98";
  };
in

{
  inherit nixpkgs;
  nixos = nixpkgs // {
    suffix = "/nixos";
  };
  "channels-nixos-stable" = nixpkgs;
  "channels-nixos-unstable" = {
    url = "https://github.com/NixOS/nixpkgs/";
    ref = "nixos-unstable";
    rev = "263ef4cc4146c9fab808085487438c625d4426a9";
  };
  "nixpkgs-master" = {
    url = "https://github.com/NixOS/nixpkgs/";
    ref = "master";
    rev = "029785a3177837b72f1f603f3b070084c36243c0";
  };
  "home-manager-module" = {
    url = "https://github.com/nix-community/home-manager";
    ref = "release-21.05";
    rev = "bcf03fa16a1f06b8a0abb27bf49afa8d6fffe8f1";
  };
}