nixosTests.nixops.unstable.legacyNetwork: Use system.includeBuildDependencies

        virtualisation.additionalPaths = [

          pkgs.hello

          pkgs.figlet

          # This includes build dependencies all the way down. Not efficient,

          # but we do need build deps to an *arbitrary* depth, which is hard to

          # determine.

          (allDrvOutputs nodes.server.config.system.build.toplevel)

        ];

        # TODO: make this efficient, https://github.com/NixOS/nixpkgs/issues/180529

        system.includeBuildDependencies = true;

      };

      server = { lib, ... }: {

        imports = [ ./legacy/base-configuration.nix ];