Doctrine autoloader tries to load class again and fails with fatal error - with fix

Doctrine_Core::autoload around line 1107
if (strpos($className, 'sfYaml') === 0 || class_exists($className, false)) {

should be changed to

if (strpos($className, 'sfYaml') === 0) {

otherwise you get:
Warning: require(/srv/www/pacs.lan/site/lib/Doctrine/Parser/sfYaml/Doctrine_Query_From.php) [function.require]: failed to open stream: No such file or directory in /srv/www/pacs.lan/site/lib/Doctrine/Core.php on line 1108

Fatal error: require() [function.require]: Failed opening required '/srv/www/pacs.lan/site/lib/Doctrine/Parser/sfYaml/Doctrine_Query_From.php' (include_path='/srv/www/pacs.lan/site/lib/:/srv/www/pacs.lan/site/lib/Dwoo/:.:/usr/local/lib/php') in /srv/www/pacs.lan/site/lib/Doctrine/Core.php on line 1108