protected function symlinkDocrootToLibDir() {
    $docroot = $this->getConfigValue('docroot');

    $this->say("Creating a symbolic link from ${docroot}/simplesaml to web accessible directory in the simplesamlphp library...");
    $result = $this->taskFileSystemStack()
      ->symlink("../vendor/simplesamlphp/simplesamlphp/www", "${docroot}/simplesaml")
      ->setVerbosityThreshold(VerbosityThresholdInterface::VERBOSITY_VERBOSE)
      ->run();

    if (!$result->wasSuccessful()) {
      throw new BltException("Unable create symlink.");
    }
  }