A new PHP version 5.3.9 has been released, see http://www.php.net/archive/2012.php#id2012-01-11-1 The page says "All users are strongly encouraged to upgrade to PHP 5.3.9."
Hints to compile ( ./configure options) for MediaWiki can be found here https://www.mediawiki.org/wiki/Extension:OpenID#cite_ref-compile-php_4-0