It appears that Horde requires the "domxml" PHP extension, which is apparently not a part of the standard CentOS 4.x PHP 4.x distribution. In fact, "domxml" is no longer available from the sourceforge web site as they prefer the use of the dom libraries in PHP5 instead.

http://pecl.php.net/package/domxml

Given these facts, how has anyone gotten this working? I would love to replace Squirrelmail with IMP if it can be made to work without lots of customization.

Regards,
-Tom

Notice: Use of undefined constant PEAR_LOG_EMERG - assumed 'PEAR_LOG_EMERG' in /usr/share/horde/lib/Horde.php on line 204

Notice: Undefined index: log in /usr/share/horde/lib/Horde.php on line 49

A fatal error has occurred

You need the domxml PHP extension to use the configuration tool.

[line 25 of /usr/share/horde/admin/setup/config.php]