! Class g-brief Error: Can't load package europs.sty !!!. The g-brief package apparently tries to load europs.sty only if it is found on the system, and that check does not work.
I'm going to mark this as WONTFIX because the newest tetex ebuild will remain masked until it becomes obsolete - i.e., we will be using tetex-1.0.7 for the forseeable future, until tetex > 1.0.7 is available, in full-release format.