/usr/share/common-lisp/systems/cl-fad.asd is in cl-fad 0.7.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/cl-fad/cl-fad.asd
/usr/share/common-lisp/systems/../source/cl-fad/cl-fad.asd