{
  inputs = {
    nixpkgs.url = github:NixOS/nixpkgs/nixos-22.05;

    home-manager = {
      url = github:nix-community/home-manager/release-22.05;
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs @ { self, nixpkgs, home-manager, ... }:
    let
      user = "mandlm";
      theme = "dark";       # dark or light

      buildMachineConfig = machineName: nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        specialArgs = inputs;
        modules = [
          ./configuration.nix
          ./users.nix
          ./machines/${machineName}/configuration.nix
          ./machines/${machineName}/hardware-configuration.nix

          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
            home-manager.extraSpecialArgs = { inherit user theme; };
            home-manager.users.${user} = {
              imports = [ ./home-${user}.nix ];
            };
          }
        ];
      };
    in
    {
      nixosConfigurations = {
        nixos-vm = buildMachineConfig ("nixos-vm");
        apache = buildMachineConfig ("apache");
        p330 = buildMachineConfig ("p330");
      };
    };
}