Hi,
I updated pkgsrc to the latest one with sup and rebuild packages that I 
use. That upgraded my python and bittorrent. Now bttrack.py does not 
work anymore. I sent email to maintainer but no reply so far. The 
problem seems to be introduced by one of the patches, namely patch-ad. 
It certainly worked with previous version of bittorrent.

I am not sure if anyone wants to fix this now, when 4.0 is out. Still it 
is not good to have broken packages.
I am willing to work with whoever wants to fix this, although my python 
  knowledge is limited.

Thanks,
Alex