maybe there's a reason for it, but currently openscenegraph doesn't have the option to build with USE=+qt5 replacing all qt4 related entries with qt5 allows me to build =dev-games/openscenegraph-3.2.1 on my ~amd64 (qt4 free) system. of course this is hacky and should be a proper choice between qt4 or qt5, so sorry no patch applied. Reproducible: Always
Why not, but only the cheapest way - no Qt4 and Qt5 at the same time (as that would require backward-incompatible changes to openscenegraph-osgQt.pc file. I don't think the little-to-none demand justifies the cost). Since dev-games/openscenegraph-3.2.1-r1.