If you are not running your own server, then it would be something that your webhost would have to do.
Most of the webhosts that I know probably will not recompile their PHP, unless you are paying them for a dedicated server (like Rackspace ... usually $300 plus a month).
You can always tell what options were compiled into your build by running this code:
<?
phpinfo();
?>
look for a line that says
FTP Support enables (or disabled).
If you are running your own server, then it will depend on you OS on how your compile your build.