GMP not available in XAMPP and WAMP?

Hi there, I was wondering whether it's something wrong on my side, or GMP is not enabled by default on these systems. Here's my code: [code] <?php $number = gmp_fact(1000); echo gmp_strval($number); ?> [/code] I get: Fatal error: Call to undefined function gmp_fact() in C:\xampp\htdocs\test.php on line 2 If this means that it is in fact disabled, how may I enable it? Thanks! -- --- Contact info: Skype: parham-d MSN: fire_lizard16 at hotmail dot com email: parham90 at GMail dot com