Description of problem:
I am using CentOS 5.5 and trying to create KVM guests. Whenever I try to use virt-install I get the following libvirt related error:

[root@vmtest python2.4]# virt-install --help
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 31, in ?
    import libvirt
  File "/usr/lib64/python2.4/site-packages/libvirt.py", line 12, in ?
    import cygvirtmod as libvirtmod
ImportError: No module named cygvirtmod

I also did:
[root@vmtest python2.4]# python -c 'import libvirtmod'
Traceback (most recent call last):
  File "<string>", line 1, in ?
ImportError: /usr/lib64/libvirt.so.0: undefined symbol: numa_node_to_cpus


Version-Release number of selected component (if applicable): 
libvirtd (libvirt) 0.6.3
numactl-devel-0.9.8-11.el5
Cent OS Kernel Version: 2.6.18-194.17.4.el5


I installed libvirt using yum repositories not manually.