app-laptop/tpb needs a change in dependencies to support modular X11 (see http://www.gentoo.org/proj/en/desktop/x/x11/porting-modular-x-howto.xml). The attached patch makes the necessary changes.
Created attachment 77284 [details, diff] patch to tpb ebuilds for modular X support
Fixed in CVS. Thank you for reporting this.