I had this same issue going on and I'm running Suse 8.2. There's several bugs in the code that get picked up with different compilers. Go onto www.kde.org and head to the Delopement Source Code section or whatever it's called. I used CVSup, but use whatever technique you prefer to download the kdenetwork package. Kopete is in that package, and you can build it individually without any problems. The version in there is more up to date than the one on the website, so building that one shouldn't pose any problems.