Someone

--- -	2007-01-29 12:03:12.000000000 -0800
+++ /dev/fd/63	2007-01-29 12:03:12.000000000 -0800
@@ -453,7 +453,7 @@
  * Implementation of hook_perm().
  */
 function user_perm() {
-  return array('administer access control', 'administer users', 'access user profiles', 'change own username');
+  return array('administer access control', 'administer users', 'access user profiles', 'change own username', 'user search includes email');
 }
 
 /**
@@ -482,7 +482,8 @@
         $find = array();
         // Replace wildcards with MySQL/PostgreSQL wildcards.
         $keys = preg_replace('!\*+!', '%', $keys);
-        $result = pager_query("SELECT * FROM {users} WHERE LOWER(name) LIKE LOWER('%%%s%%')", 15, 0, NULL, $keys);
+        $extend = user_access('user search includes email') ? " OR LOWER(mail) LIKE LOWER('%%%s%%')" : '';
+        $result = pager_query("SELECT * FROM {users} WHERE LOWER(name) LIKE LOWER('%%%s%%')$extend", 15, 0, NULL, $keys);
         while ($account = db_fetch_object($result)) {
           $find[] = array('title' => $account->name, 'link' => url('user/'. $account->uid));
         }