In preparation (needs decision on version and arches)
How urgent is that?
I've asked scarabeus to comment, since he kicked that off... Needed (>=4.2) as a dependency for newer opencv.
Then lets go with 4.2.9-r2. It should fix all problems and works fine here. Though I didn't do thorough testing, only building packages with portage.
Target: amd64 x86
amd64 stable
x86 stable. Last arch, closing