popsu-d7/sites/all/modules/variable/variable_realm/variable_realm.install

<?php
/**
 * @file
 * Variable API module install file
 */

/**
 * Implements hook_install()
 */
function variable_realm_install() {
  // Set module weight for it to run before most modules and initialize variable realms
  db_query("UPDATE {system} SET weight = -1000 WHERE name = 'variable_realm' AND type = 'module'");
}

/**
 * Refresh cache so new classes are found.
 */
function variable_realm_update_7000() {
  drupal_flush_all_caches();
}