I hit the bug described by the URL above ("\pgf@test" undefined -- dev-tex/pgf-2.10). Apparently that's fixed in CVS , could anybody please package it?
+*pgf-3.0.0 (15 Mar 2014)
+ 15 Mar 2014; Alexis Ballier <firstname.lastname@example.org> +pgf-3.0.0.ebuild:
+ Version bump, bug #497436. Fixes bugs #406783 and #399087. Symlink docs from
+ the texmf tree so that texdoc finds it, bug #441874.