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

    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";

    darwin.url = "github:lnl7/nix-darwin";
    darwin.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, darwin, home-manager, nixpkgs, nixos-hardware }: {
    nixosConfigurations = let
      defaultModules = [
        home-manager.nixosModules.home-manager
        ./main/desktop.nix
        ./main/fonts.nix
        ./main/general.nix
        ./main/kernel.nix
        ./main/netdata/default.nix
        ./main/networking.nix
        ./main/packages.nix
        ./main/printing.nix

        ({ config, lib, lib', ... }: {
          config = {
            _module.args = {
              lib' = lib // import ./lib { inherit config lib; };
            };

            nix = {
              autoOptimiseStore = true;
              binaryCaches = [ "https://davegallant.cachix.org" ];
              binaryCachePublicKeys = [
                "davegallant.cachix.org-1:SsUMqL4+tF2R3/G6X903E9laLlY1rES2QKFfePegF08="
              ];
              useSandbox = false;
              registry = { nixpkgs.flake = nixpkgs; };
              trustedUsers = [ "root" "dave" ];
            };

            nixpkgs.overlays = [ (import ./overlays) ];

            home-manager = {
              useGlobalPkgs = true;
              useUserPackages = true;
              users.dave.imports = [ ./home/default.nix ];
            };
          };
        })
      ];
    in {
      hephaestus = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./machines/hephaestus/configuration.nix
          ./machines/hephaestus/hardware.nix
        ] ++ defaultModules;
      };
    };
    darwinConfigurations = {
      demeter = darwin.lib.darwinSystem {
        modules = [
          ./machines/demeter/configuration.nix
          ./main/packages.nix

          ({ config, ... }: {
            config = {
              nixpkgs.overlays = [ (import ./overlays) ];
              home-manager = {
                useGlobalPkgs = true;
                useUserPackages = true;
                users.dave.imports = [ ./home/default.nix ];
              };
            };
          })
        ];
      };
    };
  };
}