/usr/share/common-lisp/systems/cffi-examples.asd is in cl-cffi 20100219-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/cl-cffi/cffi-examples.asd
/usr/share/common-lisp/systems/../source/cl-cffi/cffi-examples.asd