{
  description = "nico's linux system.";

  inputs = {
    # NixOS official package source, using the unstable branch here
    nixpkgs.url = "github:NixOS/nixpkgs/unstable";
  };

  outputs = { self, nixpkgs, ... }@inputs: {
    nixosConfigurations.pluto = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        ./configuration.nix
        ./hosts/pluto/conf.nix
        ./hosts/pluto/hardware-configuration.nix
      ];
    };
  };
}