Yum "ImportError" in FC2

[CB]

Hi,

Whenever I run Yum, I get the following:


Traceback (most recent call last):
   File "/usr/bin/yum", line 22, in ?
     import yummain
   File "/usr/share/yum/yummain.py", line 31, in ?
     import yumcomps
   File "/usr/share/yum/yumcomps.py", line 4, in ?
     import comps
   File "/usr/share/yum/comps.py", line 5, in ?
     import libxml2
   File "/usr/lib/python2.3/site-packages/libxml2.py", line 1, in ?
     import libxml2mod
ImportError: /usr/lib/python2.3/site-packages/libxml2mod.so: undefined 
symbol: xmlXIncludeProcessFlags

I also get the ImportError if I try to import libxml2 from the python 
console.

I've tried using rpm to uninstall and re-install the libxml2, 
libxml2-python, and yum rpms which I downloaded from my nearest fedora 
core 2 mirror, but still the same problem. rpm -q shows my libxml2 & 
libxml2-python to be versions as follows: libxml2-2.6.8-1 
libxml2-python-2.6.8-1.

It's possible that some manual flailing around with downloaded install 
scripts I did very late last night overwrote the libraries from the 
rpm's, but in that case wouldn't the libxml2 rpm un/re-installs have 
fixed the problem? Any ideas on how to go diagnosing from here?

Cheers,

CB.