I'll try to take a look at this, guys, but I'm just lashing together an old, crumbling hulk here. My bug regarding this broken package has been marked "WONTFIX" and we're not going to see any new stuff from the developers.

If you can't get telepathy-haze, that probably means you don't have the Collabora repository. This repository should get added in the install phase (step 6).

The other, more frightening possibility is that Collabora has shut down their repository or removed telepathy-haze from it... (EDIT: Just checked, it seems to be still there!)