https://lists.debian.org/debian-python/2021/11/msg00073.html
Re: [Help] diskcache: FTBFS now even earlier due to Python3.10
due tohelp
https://manpages.ubuntu.com/manpages/xenial/man3/Class::MakeMethods::Utility::DiskCache.3pm.html
Ubuntu Manpage: Class::MakeMethods::Utility::DiskCache - Optional Template feature
Optional Template feature
ubuntumanpageclassutilityoptional