There is an update to kdelibs for CentOS 3.1
https://rhn.redhat.com/errata/RHSA-2004-222.html refers.
Updated files are :-
updates/i386/RPMS/kdelibs-3.1.3-6.4.i386.rpm updates/i386/RPMS/kdelibs-devel-3.1.3-6.4.i386.rpm updates/i386/SRPMS/kdelibs-3.1.3-6.4.src.rpm
These are available at http://mirror.centos.org/3.1/ and should be on all mirrors within a few hours.
To update to the latest version 'yum update kdelibs' should be sufficient.
Lance