xUbuntu_12.10 and 13.04: nothing provide kdebase-workspace-dev

Hello,
I have problem with building xUbuntu 12.10 and 13.04 packages with kdebase-workspace-dev dependency.
The same package is successfully built for Debian 6.0 and 7.0, and for xUbuntu 12.04.

I cant realize why this kdebase-workspace-dev dependency missing in 12.10 and 13.04 version of Ubuntu repos?