it from source control: http://www.mediawiki.org/wiki/Download_from_SVN
=== PHP 5.2 now required ==
-In 1.18, the lowest supported version of MediaWiki is now 5.2.x. Please upgrade
+In 1.18, the lowest supported version of MediaWiki is now 5.2.3. Please upgrade
PHP if you have not done so prior to upgrading MediaWiki.
=== Configuration changes in 1.18 ===