joachim, posting the same problem in multiple threads makes it hard to see where you may have been answered or answered questions that others have asked.
I have been doing Tier 2 in Xcode since v1076. And converted to Xcode 5 when Apple forced that issue. I have not updated since v10819, so I don't know if there are any issues with the template they provided for that.
As I commented in another thread you posted about, it looks like you are trying to compile an Example project and it is not up to date at all. The image you
posted here shows that it is looking for a library that does not exist in the AppGameKit build anymore (libAGKiphone.a). That may have been used in the earliest releases, but not anymore. And I can pretty much guarantee that the AppGameKit core files in the Games - Smackit project are not current with those needed for the most recent releases.
Have you tried compiling the tier 2 template without doing anything to it?
Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master