diff -r 782aaed1622d admin/environment.xml
--- a/admin/environment.xml	Mon Dec 10 10:51:18 2007 +0900
+++ b/admin/environment.xml	Mon Dec 10 15:53:17 2007 +0900
@@ -167,6 +167,11 @@
           <ON_CHECK message="tokenizerrecommended" />
         </FEEDBACK>
       </PHP_EXTENSION>
+      <PHP_EXTENSION name="ctype" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="ctyperecommended" />
+        </FEEDBACK>
+      </PHP_EXTENSION>
     </PHP_EXTENSIONS>
     <CUSTOM_CHECKS>
       <CUSTOM_CHECK file="question/upgrade.php" function="question_check_no_rqp_questions" level="optional">
@@ -229,6 +234,11 @@
           <ON_CHECK message="tokenizerrecommended" />
         </FEEDBACK>
       </PHP_EXTENSION>
+      <PHP_EXTENSION name="ctype" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="ctyperecommended" />
+        </FEEDBACK>
+      </PHP_EXTENSION>
     </PHP_EXTENSIONS>
     <CUSTOM_CHECKS>
       <CUSTOM_CHECK file="question/upgrade.php" function="question_check_no_rqp_questions" level="optional">
diff -r 782aaed1622d install/lang/en_utf8/installer.php
--- a/install/lang/en_utf8/installer.php	Mon Dec 10 10:51:18 2007 +0900
+++ b/install/lang/en_utf8/installer.php	Mon Dec 10 15:53:17 2007 +0900
@@ -40,6 +40,7 @@
 $string['configurationcompletehead'] = 'Configuration completed';
 $string['configurationcompletesub'] = 'Moodle made an attempt to save your configuration in a file in the root of your Moodle installation.';
 $string['continue'] = 'Continue';
+$string['ctyperecommended'] = 'Installing the optional CTYPE library is highly recommended in order to improve site performance, particularly if your site is supporting non-latin languages.';
 $string['curlrecommended'] = 'Installing the optional Curl library is highly recommended in order to enable Moodle Networking functionality.';
 $string['customcheck'] = 'Other Checks';
 $string['database'] = 'Database';
diff -r 782aaed1622d lang/en_utf8/admin.php
--- a/lang/en_utf8/admin.php	Mon Dec 10 10:51:18 2007 +0900
+++ b/lang/en_utf8/admin.php	Mon Dec 10 15:53:17 2007 +0900
@@ -232,6 +232,7 @@ For example:  standard,orangewhite.';
 $string['cronerrorpassword'] = 'Sorry, you have not provided a valid password to access this page';
 $string['cronremotepassword'] = 'Cron password for remote access';
 $string['cronwarning'] = 'The <a href=\"cron.php\">cron.php maintenance script</a> has not been run for at least 24 hours.';
+$string['ctyperecommended'] = 'Installing the optional CTYPE library is highly recommended in order to improve site performance, particularly if your site is supporting non-latin languages.';
 $string['csvdelimiter'] = 'CSV delimiter';
 $string['curlrecommended'] = 'Installing the optional Curl library is highly recommended in order to enable Moodle Networking functionality.';
 $string['customcheck'] = 'Other Checks';