/usr/share/common-lisp/systems/abnf.asd is in cl-abnf 20131211-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/abnf/abnf.asd
/usr/share/common-lisp/systems/../source/abnf/abnf.asd