{
  description = "NixOS configurations for crossbox and anvil";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    strix-halo.url = "github:hellas-ai/nix-strix-halo";
  };

  outputs = { self, nixpkgs, strix-halo, ... }:
  let
    mkHost = { hostDir, extraModules ? [], overlays ? [] }:
      nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./configuration.nix
          hostDir
          ({ ... }: { nixpkgs.overlays = overlays; })
        ] ++ extraModules;
      };
  in {
    nixosConfigurations.crossbox = mkHost {
      hostDir = ./hosts/crossbox;
      overlays = [ strix-halo.overlays.default ];
      extraModules = [ ./sdr.nix ./syncthing.nix ];
    };

    nixosConfigurations.anvil = mkHost {
      hostDir = ./hosts/anvil;
      extraModules = [ ./sdr.nix ./syncthing.nix ];
    };
  };
}