Show a list of missing extensions for networking support to be enabled, if they're not installed.

htdocs/theme/default/templates/admin/networking.tpl

@@ -2,7 +2,15 @@
 {include file="columnfullstart.tpl"}
 <h2>{str section=admin tag=networking}</h2>
 
-
+{if $missingextensions}
+<p>{str section=admin tag=networkingextensionsmissing}</p>
+<ul>
+{foreach from=$missingextensions item=extension}
+    <li><a href="http://www.php.net/{$extension|escape}">{$extension|escape}</a></li>
+{/foreach}
+</ul>
+{else}
 {$NETWORKINGFORM}
+{/if}
 {include file="columnfullend.tpl"}
 {include file='footer.tpl'}