Update: 2.5.1-7 fixes the issue.

I always say "Debian unstable" should be renamed to "Debian stable" (and Debian stable -> deprecated), because it hardly ever gets broken.

Well, this time of the year has come. WordPress got a security update backported from 2.6.1->2.5.1, but.. only half-baked 🙂 (some functions are missing)

The bad version is easily recognizable by this PHP error:

"Fatal error: Call to undefined function admin_url() in /usr/share/wordpress/wp-includes/link-template.php on line 470"

1 2	"Fatal error: Call to undefined function admin_url() in /usr/share/wordpress/wp-includes/link-template.php on line 470"

A debian bug has already been opened.