* Detected file collision(s): * * /usr/share/man/man1/botan.1.bz2 * * Searching all installed packages for file collisions... * * Press Ctrl-C to Stop * * dev-libs/botan-2.19.3-r2:2::gentoo * /usr/share/man/man1/botan.1.bz2 * * Package 'dev-libs/botan-3.2.0-r1' NOT merged due to file collisions. * If necessary, refer to your elog messages for the whole content of the * above message. Reproducible: Always May or may not be yet another build failure related to USE=doc…
Workaround for me: equery d botan emerge -C botan:2. Since botan:2 was only required by librnp, but updating librnp pulls in botan:3 instead.
On another machine, both are somehow installed at the same time. On that machine, botan:2 doesn't have /usr/share/man/man1/botan.1.bz2 for some reason, though.