The newest OGRE classic ebuild in the tree is 1.12.9, which is ancient and has problems with libsdl2 support. Bump to latest stable release.
While waiting, 13.6.0 has been released.
While waiting, 13.6.1 has been released.
While waiting, 14.0.1 has been released. :P
(In reply to benoit.dufour from comment #3) > While waiting, 14.0.1 has been released. :P What do you mean: "while waiting"? 13.6.1 is in the tree for over 6 months now. I can not update a PR that was merged half a year ago. ;-)