/usr/share/common-lisp/systems/ieee-floats.asd is in cl-ieee-floats 20150608-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/common-lisp/systems/../source/ieee-floats/ieee-floats.asd
/usr/share/common-lisp/systems/../source/ieee-floats/ieee-floats.asd