Hi, I opened a similar issue, please take a look https://bugs.gentoo.org/668404 The solution for this project is just executing the command 'autoreconf --install --force' in the root of the project
Since https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=0e8bbfc4248ae7863747ce38a0dcda86830c2327, we're all good, I think?