{
  inputs = {
    agenix.url = "github:ryantm/agenix";
    nixos-hardware.url = "github:NixOS/nixos-hardware";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
    nur.url = "github:nix-community/NUR";

    home-manager = {
      url = "github:nix-community/home-manager/release-23.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nix-index-database = {
      url = "github:Mic92/nix-index-database";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    nixpkgs,
    nixpkgs-unstable,
    ...
  } @ args: {
    nixosConfigurations.alice = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      specialArgs = args;
      modules = let
        overlay-unstable = final: prev: {
          unstable = nixpkgs-unstable.legacyPackages.${prev.system};
        };
      in [
        ./hosts/alice
        (_: {nixpkgs.overlays = [(import ./overlay args) overlay-unstable];})
      ];
    };
  };
}