The notification area icon (systray) isn't shown, although the trayicon.so file in /usr/lib/gajim exists (the option "Icon in systray" from preferences is greyed).

Here is the output when I tried to import trayicon.so in python:
laurent@winter /usr/lib/gajim $ python
Python 2.4.1 (#1, Apr 5 2005, 11:00:51)
[GCC 3.4.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import trayicon
Traceback (most recent call last):
File "<stdin>", line 1, in ?
ImportError: libpangocairo-1.0.so.0: cannot open shared object file: No such file or directory
>>>