dev-lang/toluapp-1.0.92 was marked stable by amd64 (bug 255080), but it doesn't build a shared library as required for cegui, configure output, * Using external tolua++ library: no the cegui ebuild should depend on >=1.0.93 which is the first version that builds shared library libtolua++.so in Gentoo
That would mean dropping back to unstable. So no. It can just use the internal toluapp until 1.0.93 is marked stable.