runtime error in setup.py

Hey folks. I'd love to get this uploader working for my ubuntu installation. I'm running Ubuntu with Python 2.5.2. I get the following error when I run "phython setup.py build"

Traceback (most recent call last):
  File "setup.py", line 11, in <module>
    version = Popen(["bzr", "revno"], stdout=PIPE).communicate()[0]
  File "/usr/lib/python2.5/subprocess.py", line 594, in __init__
    errread, errwrite)
  File "/usr/lib/python2.5/subprocess.py", line 1147, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

Any clues?

Frank