here is my configure line:
./configure --with-zlib --with-mm --with-mysql=/usr/local/mysql --with-mcal=../libmcal --with-imap=../../imap --with-gettext --enable-ftp --with-db3=/usr/local/BerkeleyDB.3.2 --with-apache=/usr/local/apache --with-mcrypt

I am using IMP from the HORDE project if you are familiar with it. 

The script that it appears to be failing on is as follows, it is rather long sorry:

<?php
function isPreferred($server, $key = null)
{
    global $HTTP_SERVER_VARS;
    static $urlServer;
    
    if (!isset($urlServer)) $urlServer = Horde::getFormData('server');
    if (!empty($urlServer)) {
        return $key == $urlServer;
    }
    
    if (is_array($server['preferred'])) {
        foreach ($server['preferred'] as $preferred) {
            if ($preferred == $HTTP_SERVER_VARS['SERVER_NAME'] ||
                $preferred == $HTTP_SERVER_VARS['HTTP_HOST']) {
                return true;
            }
        }
    } elseif ($server['preferred'] == $HTTP_SERVER_VARS['SERVER_NAME'] ||
              $server['preferred'] == $HTTP_SERVER_VARS['HTTP_HOST']) {
        return true;
    }

    return false;
}

define('IMP_BASE', dirname(__FILE__));
require_once IMP_BASE . '/lib/base.php';
if ($conf['connections']['track']) {
    include_once IMP_BASE . '/../lib/Connection.php';
}

/* Additional configuration (dependent on the above code libraries) */
require IMP_BASE . '/config/servers.php';

if ($conf['log']['enabled']) {
    include_once 'Log.php';
    $log = &Log::singleton($conf['log']['type'], $conf['log']['name'],
                           $conf['log']['ident'], $conf['log']['conf']);
}

/* Map the various values for $reason to more descriptive status messages. */
$reasons = array('login'   => '',
                 'timeout' => _("Either you have logged in incorrectly or your login has expired. Please login again."),
                 'logout'  => sprintf(_("You have been logged out of %s. Thank you for using the system. If you wish to log in again, please use the form below."), $conf['sitename']),
                 'failed'  => _("Login failed for some reason. Most likely your username or password was entered incorrectly."));

/* Default to 'login' if no $reason is set. */
$reason = Horde::getFormData('reason', 'login');
$actionID = Horde::getFormData('actionID', NO_ACTION);

/* Initialize the session routines. */
session_name($conf['session_name']);
@session_start();

if (isset($HTTP_SESSION_VARS['imp']) && is_array($HTTP_SESSION_VARS['imp'])) {
    if ($reason == 'logout') {
        $imp = &$HTTP_SESSION_VARS['imp'];
        if (isset($imp['user'])) {
            $prefs = Prefs::factory($conf['prefs']['driver'],
                $registry->getApp(), $imp['user'],
                Secret::read(Secret::getKey('imp'), $imp['pass']),
                $conf['prefs']['params']);
            $prefs->store();
        }
        $HTTP_SESSION_VARS['imp'] = null;
        session_unregister('imp');
    } elseif ($reason == 'failed') {
        $HTTP_SESSION_VARS['imp'] = null;
        session_unregister('imp');
    } else {
        /* If there is an existing session, redirect the user to the mailbox. */
        if ($actionID == IMP_LOGIN) {
            header('Location: ' . Horde::applicationUrl('mailbox.php?actionID=' . IMP_LOGIN, true));
            exit;
        } elseif (($actionID == LOGIN_COMPOSE) || (isset($HTTP_GET_VARS['action']) && ($HTTP_GET_VARS['action'] == 'compose'))) {
            header('Location: ' . Horde::applicationUrl('mailbox.php?actionID=' . LOGIN_COMPOSE, true));
            exit;
        } else {
            header('Location: ' . Horde::applicationUrl('mailbox.php', true));
            exit;
        }
    }
}

/* Log the reason if logging is enabled. */
if ($conf['log']['enabled']) {
    $log->log($HTTP_SERVER_VARS['REMOTE_ADDR'] . ' ' . $reason, LOG_INFO);
}

/* Redirect the user on logout if redirection is enabled. */
if (($reason == 'logout') && $conf['user']['redirect_on_logout']) {
    header('Location: ' . $conf['user']['redirect_on_logout']);
    exit;
}

/* Redirect the user if an alternate login page has been specified. */
if ((in_array($reason, array('login', 'failed', 'timeout'))) && $conf['user']['alternate_login']) {
    header('Location: ' . $conf['user']['alternate_login']);
    exit;
}

/* Initialize the password key. */
Secret::setKey('imp');

/* Set the actionID of the login form */
if ((isset($HTTP_GET_VARS['action']) && $HTTP_GET_VARS['action'] == 'compose') ||
    ($actionID == LOGIN_COMPOSE)) {
    $actionID = LOGIN_COMPOSE;
} else {
    $actionID = IMP_LOGIN;
}

/* Get the default preferences values. */
$prefs = Prefs::factory('none', $registry->getApp());
$prefs->setDefaults(IMP_BASE . '/config/prefs.php');

/* Grab some default values from the first entry in config/servers.php. */
reset($servers);
$server_key = key($servers);
$server_value = $servers[$server_key]['server'];
$protocol_value = $servers[$server_key]['protocol'];
$port_value = $servers[$server_key]['port'];
$folders_value = $servers[$server_key]['folders'];
$namespace_value = $servers[$server_key]['namespace'];
$maildomain_value = $servers[$server_key]['maildomain'];

/*
 * If the server list is used but should be hidden (for virtual hosting),
 * make sure we output a server name to use.
 */
if ($conf['server']['server_list'] && $conf['server']['server_list_hidden']) {
    /*
     * Iterate through the servers in an attempt to locate a "preferred"
     * server for this web server.  If none if found, we default to the
     * first entry in the hash (indicated by the $server_key value set
     * above).
     */
    foreach ($servers as $key => $curServer) {
        if (isPreferred($curServer, $key)) {
            $server_key = $key;
            break;
        }
    }
}

/* Build the <select> widget for the servers list. */
if ($conf['server']['server_list'] && !$conf['server']['server_list_hidden']) {
    $servers_list = '';

    foreach ($servers as $key => $curServer) {
        $sel = (isPreferred($curServer, $key)) ? ' selected="selected"' : '';
        $servers_list .= "<option value=\"$key\"$sel>";
        $servers_list .= $curServer['name'] . "</option>\n";
    }
}

/* Build the <select> widget containing the available languages. */
if (!$prefs->isLocked('language')) {
    $langs = '<select name="new_lang" onchange="selectLang()">';
    foreach ($nls['languages'] as $key => $val) {
        $sel = ($key == $language) ? ' selected="selected"' : '';
        $langs .= "<option value=\"$key\"$sel>$val</option>\n";
    }
    $langs .= '</select>';
}

$title = _("Welcome");
$js_onLoad = 'setFocus()';
include $conf['paths']['templates'] . '/doctype.inc';
include $conf['paths']['templates'] . '/common-header.inc';
include $conf['paths']['templates'] . '/login/login.inc';
if (@is_readable(IMP_BASE . '/config/MOTD.html')) {
    include IMP_BASE . '/config/MOTD.html';
}
include $conf['paths']['templates'] . '/common-footer.inc';

?>

Thank you!
Terry