On Thu, May 26 2011, Sven Bretfeld wrote:

> It is definitely not there in 23.1, the emacs-snapshot package which
> AFAIK is the orebokech version that seems not to have been updated since
> quite a while. I have checked the sources of minibuffer.el and it does
> not define completion-at-point-functions. 

orebokech version is dead.

> This is a pity since Emacs Snapshot is the most actual you can get on
> Ubuntu without adding foreign repos or compiling. 

emacs-snapshot in Ubuntu is a joke.

> I have tried to use Emacs 24 from the emacs.naquadah.org repository
> which, however, does not contain a Natty section. With the Maverick
> packages org-contacts works.

The Maverick ones should work flawlessly on Natty anyhow, as you
discovered.

-- 
Julien Danjou
❱ http://julien.danjou.info