webdav in Ez publish on postgresql

So you're running Ez Publish 4.0 backed by a Postgresql database, and you want to use the webdav functionality. You followed the howto, but to no avail. Your webdav client does not have access (I had the message "folder or file does not exist" with Konqueror).
Here's a good advice: enable PHP logging, and take a close look to it. I found this error message for every webdav request sent:

PHP Fatal error:  Call to undefined function mysql_real_escape_string() in /var/www/ezpublish-4.0.0/lib/ezdb/classes/ezmysqldb.php on line 908

The solution is simple, just install the php-mysql package.

I hope this saves you some time :-)