Libcdio 2.1.1 has now been released. You see what has changed and get tarballs from github now: https://github.com/libcdio/libcdio/releases/tag/2.1.1
Thanks again to all who have contributed in the last 7 years since the last release. I haven't been able to get the key signing on ftp.gnu.org working so get tarballs from github.
