/usr/ is in cl-fftw3 1.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/common-lisp/
/usr/share/common-lisp/source/
/usr/share/common-lisp/source/cl-fftw3/
/usr/share/common-lisp/source/cl-fftw3/cl-fftw3.asd
/usr/share/common-lisp/source/cl-fftw3/common.lisp
/usr/share/common-lisp/source/cl-fftw3/ffi.lisp
/usr/share/common-lisp/source/cl-fftw3/package.lisp
/usr/share/common-lisp/source/cl-fftw3/specials.lisp
/usr/share/common-lisp/source/cl-fftw3/tests.lisp
/usr/share/common-lisp/source/cl-fftw3/transform.lisp
/usr/share/common-lisp/source/cl-fftw3/wisdom.lisp
/usr/share/common-lisp/systems/
/usr/share/doc/
/usr/share/doc/cl-fftw3/
/usr/share/doc/cl-fftw3/copyright
/usr/share/doc/cl-fftw3/changelog.Debian.gz
/usr/share/common-lisp/systems/cl-fftw3.asd