compilation finished after, well, quite a lot of time (~13h)...
I checked all the files and one package was missing (pykolab) because of some missing dependencies.
Checking again showed me that the following packages are missing:
intltool libglib2.0-dev python-icalendar python-noseOk. So we install these packages and continue with pykolab... (python-icalendar we compiled last night).
And again, compilation will take its time.