_: {
  nix.settings = {
    substituters = [
        "https://nix-community.cachix.org"
        "https://nixpkgs-wayland.cachix.org"
        "https://viperml.cachix.org"
    ];
    trusted-public-keys = [
        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
        "nixpkgs-wayland.cachix.org-1:3lwxaILxMRkVhehr5StQprHdEo4IrE8sRho9R9HOLYA="
        "viperml.cachix.org-1:qZhKBMTfmcLL+OG6fj/hzsMEedgKvZVFRRAhq7j8Vh8="
    ];
  };
}