/usr/share/common-lisp/systems/cl+ssl.asd is in cl-plus-ssl 20151218-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/cl+ssl/cl+ssl.asd
/usr/share/common-lisp/systems/../source/cl+ssl/cl+ssl.asd