Red Hat ships with KDE v 3.1.4, Kopete want to run with 3.2.x. There is an older version that will run on 3.1.1 (http://kopete.kde.org/index.php?page=downloads
) however it my not run with 3.1.4
You could try and build it youself (the source is at the link above) or wait a bit until someone releases an rpm package for RH9 or until RH releases a KDE update (to v 3.2)
In the meanwhile you might try gaim?