KDE does not support GCC 4.0 yet. Kopete is one of the KDE applications.
I'd suggest that you update your KDE package on FC4. The latest is 3.4.2, which includes kopete 0.10.3.
If you don't have KDE installed on your machine, try the following command:
Code:
# yum install kdenetwork
This will install all the necessary packages for you.