The latest version of flatbuffers is 1.9.0: https://github.com/google/flatbuffers/releases/tag/v1.9.0
Thanks, fixed in git. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=3eaac187d302819b6c54ee8d9bffb9243968e086 If this package is useful for you, please feel free to bump it or add yourself as a maintainer.