Check user Drupal role id for Features sanity

mymodule.install.php

/**
 * Implements hook_requirements().
 */
function mymodule_requirements($phase) {
  $requirements = array();
  // Ensure translations don't break at install time
  $t = get_t();

  if (defined('MYMODULE_RID')) {
    // Test role ID, make sure it equals MYMODULE_RID.
    $roles = user_roles();
    $rid = array_search('member', $roles);
    $requirements['member_role'] = array(
      'title' => $t('Member role ID'),
      'value' => $rid,
    );
    if ($rid != MYMODULE_RID) {
      $requirements['member_role']['description'] = $t('The X role has an incorrect ID. It needs to be <code>!rid</code>.', array('!rid' => MYMODULE_RID));
      $requirements['member_role']['severity'] = REQUIREMENT_ERROR;
    }
  }

  return $requirements;
}

Various exportables use the rid when referring to a user role, but exported roles are defined by their name only. There are no guarantees that the rid will be the same on your dev, staging and production sites. This hook_requirements() implementation warns admins if the rid is incorrect.

MYMODULE_RID needs to be defined obviously, or you can hard-code it if you feel lazy.