{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-24.11";
    catppuccin.url = "github:catppuccin/nix";
    colmena.url = "github:zhaofengli/colmena";
    colmena.inputs.nixpkgs.follows = "nixpkgs";
    disko.url = "github:nix-community/disko";
    disko.inputs.nixpkgs.follows = "nixpkgs";
    home-manager.url = "github:nix-community/home-manager/master";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    # nixos-cosmic.url = "github:lilyinstarlight/nixos-cosmic";
    # nixos-cosmic.inputs.nixpkgs.follows = "nixpkgs";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
    nixpkgs-zoom.url =
      "github:NixOS/nixpkgs/06031e8a5d9d5293c725a50acf01242193635022";
    # nixpkgs-zoom.url = "github:NixOS/nixpkgs/79077930a404da8b7cd7ecf2fe05e8a80347e340";
    naviterm.url = "gitlab:detoxify92/naviterm";
    nixvim.url = "github:nix-community/nixvim";
    nixvim.inputs.nixpkgs.follows = "nixpkgs";
    bzmenu.url = "github:e-tho/bzmenu";
  };

  outputs = inputs@{ self, nixpkgs, nix, nixpkgs-stable, nixos-hardware
    , home-manager, catppuccin, colmena, ... }:
    let
      inherit (self) outputs;
      lib = nixpkgs.lib // home-manager.lib;
    in {
      inherit lib;
      nixpkgs.config.allowUnfree = true;
      config.allowUnfree = true;
      nixpkgs.config.allowUnfreePredicate = pkg:
        builtins.elem (lib.getName pkg) [ "widevine-cdm" ];
      colmena = {
      # colmenaHive = colmena.lib.makeHive {
        meta = {
          nixpkgs = import nixpkgs { system = "x86_64-linux"; };
          specialArgs = { inherit inputs outputs; };
        };
        # ace = import ./hosts/ace/colmena.nix;          # Acer C720
        book = import ./hosts/book/colmena.nix;        # Google Pixelbook 2017 w/ nvme. Storage dead
        display = import ./hosts/display/colmena.nix; # Pi4
        # eve = import ./hosts/eve/colmena.nix; # Google Pixelbook 2017 w/ eMMC.
        fred = import ./hosts/fred/colmena.nix;
        loki = import ./hosts/loki/colmena.nix;
        # pocket2 = import ./hosts/pocket2/colmena.nix;
        smaug = import ./hosts/smaug/colmena.nix;
        w1 = import ./hosts/w1/colmena.nix;
        # w2 = import ./hosts/w2/colmena.nix;
        # t2 = import ./hosts/t2/colmena.nix;
        pi1 = import ./hosts/pi1/colmena.nix;
      };

      nixosConfigurations = {
        # clients
        ace = lib.nixosSystem {
          modules = [ ./hosts/ace ];
          specialArgs = { inherit inputs outputs; };
        };
        dragon = lib.nixosSystem {
          modules = [ ./hosts/dragon ];
          specialArgs = { inherit inputs outputs; };
        };
        eve = lib.nixosSystem {
          modules = [ ./hosts/eve ];
          specialArgs = { inherit inputs outputs; };
        };
        loki = lib.nixosSystem {
          modules = [ ./hosts/loki ];
          specialArgs = { inherit inputs outputs; };
        };

        pocket2 = lib.nixosSystem {
          modules = [ ./hosts/pocket2 ];
          specialArgs = { inherit inputs outputs; };
        };
        smaug = lib.nixosSystem {
          modules = [ ./hosts/smaug ];
          specialArgs = { inherit inputs outputs; };
        };
        t2 = lib.nixosSystem {
          modules = [ ./hosts/t2 ];
          specialArgs = { inherit inputs outputs; };
        };
        pi1 = lib.nixosSystem {
          modules = [ ./hosts/pi1 ];
          specialArgs = { inherit inputs outputs; };
        };

        # servers
        display = lib.nixosSystem {
          modules = [ ./hosts/display ];
          specialArgs = { inherit inputs outputs; };
        };
        fred = lib.nixosSystem {
          modules = [ ./hosts/fred ];
          specialArgs = { inherit inputs outputs; };
        };
        vm = lib.nixosSystem {
          modules = [
            "${nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-gnome.nix"
            "${nixpkgs}/nixos/modules/installer/cd-dvd/channel.nix"
            ./hosts/vm
          ];
          specialArgs = { inherit inputs outputs; };
        };
        harper2 = lib.nixosSystem {
          modules = [ ./hosts/harper2 ];
          specialArgs = { inherit inputs outputs; };
        };
        harper = lib.nixosSystem {
          modules = [ ./hosts/harper ];
          specialArgs = { inherit inputs outputs; };
        };
        nuwww = lib.nixosSystem {
          modules = [ ./hosts/nuwww ];
          specialArgs = { inherit inputs outputs; };
        };
        pihole = lib.nixosSystem {
          modules = [ ./hosts/pihole ];
          specialArgs = { inherit inputs outputs; };
        };
        www2 = lib.nixosSystem {
          modules = [ ./hosts/www2 ];
          specialArgs = { inherit inputs outputs; };
        };
        w1 = lib.nixosSystem {
          modules = [ ./hosts/w1 ];
          specialArgs = { inherit inputs outputs; };
        };
        # w2 = lib.nixosSystem {
        #   modules = [./hosts/w2];
        #   specialArgs = {
        #     inherit inputs outputs;
        #   };
        # };
      };
    };
}