A copy of the ebuild for 2.12.13 works, but that ebuild has a bogus dependancy which should be fixed. 2.12.13 depends on ghostscript-esp rather than virtual/ghostscript, due to bug 155236, but that is a BOGUS requirement (at least for 2.12.13 and 2.12.14). ghostscript-gpl works fine; there is no need to force ghostscript-esp.
Thanks for the notice! Fixed and bumped in CVS.