New calendar backend - How do I make it appear?

Hi,

I am writing a calendar backend for Brutus. I am (to the best of my
knowledge) following the wiki to the letter:

http://go-evolution.org/EDS_Architecture#Calendar_backends

The problem is that my calendar backend don't show up when trying to
create a new calendar in the Evolution 2.4 UI. I haven't yet tried
Evolution 2.6 but it should work in 2.4 as well...

I can't event see (using strace) that any of the libecalbackend*.so
libraries are being read by Evolution.

So, are there any magical trick (such as the ".urls" file for Camel)
that I must use?

Thanks a lot in advance,
  jules



PS: Full source (look in "brutus/idl/products/evolution/2.4") here:

http://go-evolution.org/EDS_Architecture#Calendar_backends