If you (not "u"; that might be fine with your friends, but standard
English is clearest on a public mailing list) re-read the problem report
Alexis submitted, you will find "Build #1" says:
LB_DISTRIBUTION="wheezy"
i.e. not unstable.
I have not yet tested wheezy kde-desktop with the latest 4.x release or
debian-next git HEAD, but I agree that not being able to build wheezy
kde-desktop with no additional options specified is something we need to
address if it's not already fixed.