Cannot run swup ...

Hello:
I have a problem when trying to run the latest swpd program. I just make and
install the latest version program. (Downloaded from
http://swup.trustix.org/pub/nightly_cvs/)
The message appear to be:

root@VooDoo2 /tmp/swup-0.0.20040520# swup --upgrade vim
Traceback (most recent call last):
  File "/usr/sbin/swup", line 20, in ?
    swup.main( sys.argv[1:] )
  File "/usr/lib/swup/swup.py", line 476, in main
    import upgrade
  File "/usr/lib/swup/upgrade.py", line 57, in ?
    import resolver
  File "/usr/lib/swup/resolver.py", line 26, in ?
    from swuplib import spiparser, utils
  File "/usr/lib/python2.2/site-packages/swuplib/spiparser.py", line 6, in ?
    import xml.sax, sys, string, types, os, re, utils
ImportError: No module named xml.sax

My system runs a complete installation of:
2.4.21-13trfirewall #1 Thu Jul 10 15:57:32 CEST 2003 i586 unknown unknown
GNU/Linux

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Where is the problem?
What I must be do?

Thanks.
Andrew.