/usr/share/common-lisp/systems/cl-base64.asd is in cl-base64 3.3.3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/cl-base64/cl-base64.asd
/usr/share/common-lisp/systems/../source/cl-base64/cl-base64.asd