@Override
    public ClassPath getAdditionalClassPath() {
        return gradleInstallation == null ? DefaultClassPath.of(classpath) : ClassPath.EMPTY;
    }

    @Override
    public Module getExternalModule(String name) {
        Module module = externalModules.get(name);
        if (module == null) {
            module = loadExternalModule(name);
            externalModules.put(name, module);
        }