Drupal: Create a nodequeue if it doesn't exist already

nodequeue_create.php

  drupal_load('module', 'nodequeue');

  // Homepage Features
  $queue = nodequeue_load_queue_by_name('homepage_features');
  if (empty($queue)) {
    $queue = new stdClass();
    $queue->title = 'Homepage Features';
    $queue->name = 'homepage_features';
    $queue->size = 4;
    $queue->owner = 'nodequeue';
    $queue->types = array('homepage_feature');
    $queue->reverse = $queue->count = $queue->i18n = $queue->reference = 0;
    $queue->subqueue_title = $queue->link = $queue->link_remove = '';
    $queue->new = $queue->show_in_tab = $queue->show_in_ui = TRUE;
    $queue->show_in_links = FALSE;
    $queue->roles = $queue->subqueues = array();
    $queue->add_subqueue = array(
      'Homepage Features',
    );
    nodequeue_save($queue);
  }