Enable DOM within PHP. Help me please!

I am running FC4 86x64. Apache 2.0 and PHP 5.0.4 works well. But when trying
<?php
$dom = new DOMDocument();
$xml = '<?xml version="1.0" encoding="UTF-8"?>
<node1>
<node2 />
</node1>
';
$dom->loadXML( $xml );
$nodeList = $dom->getElementsByTagName( 'node1' );
$node1 = $nodeList->item(0);
foreach ( $node1->childNodes as $node ) {
echo 'Class: ' . get_class( $node ) . "n";
}
?>
I get an error
PHP Fatal error: Class 'DOMDocument' not found in test1.php on line 2
Run phpinfo(), I see --disable-dom

I don't know how to enable DOM within PHP
Furthermore, when I try to run ./configure to fix the above problem as an advice from Google, it shows
bash: ./configure: No such file or directory

I am a beginner of Linux.
Anybody can help me with these problems? Thanks a lot!!!

chicken

Sounds like you need to rebuild the PHP. For linux - start here.

I ran into this problem too and I was not satisfied with 'rebuild' answer. Turns out, Fedora 4 doesn't come with the php-xml rpm installed. you can find this rpm at http://rpm.pbone.net/index.php3/stat/4/idpl/2377446/com/php-xml-5.0.4-10.5.i386.rpm.html (my php rpm was version 5.0.4-10.5, so i used that php-xml version). I installed this using rpm -i php-xml... and the DOMDocument worked fine.

Yep, that was exactly my problem, worked like a charm for me. Thx for the fix!

NOTE!
Do not forget to restart your webserver when using php pages in it.
eg use
/etc/init.d/httpd restart

I did the same for FC7. It's working fine. Great job.