/usr/share/common-lisp/systems/rsm-mod.asd is in cl-rsm-mod 1.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/rsm-mod/rsm-mod.asd
/usr/share/common-lisp/systems/../source/rsm-mod/rsm-mod.asd