k3b-0.11.21 released today. Just bug fixes, so it probably will work by just renaming the ebuild. This release fixes compilation problems with flac-1.1.2, so it probably can be unmasked now, see bug 82558. I'll try to test all of this in a minute.
Actually, no, there's still a bug in k3b-0.11.21 that doesn't let it compile against flac-1.1.2. There's already an upstream fix though, so I guess we'll wait and see if they release another k3b or what.
Created attachment 53632 [details, diff] patch to k3b-0.11.20.ebuild OK, they released another version of k3b. So I unmasked =media-libs/flac-1.1.2 and emerged that (it complained about some portage.patch not being able to be applied, but the emerge worked anyway). Then I edited the k3b ebuild, see attached patch. Then I emerged k3b-0.11.22 and it compiled cleanly against flac-1.1.2, and it works.
In portage.