/usr/ is in libpoldiff-dev 3.3.6.ds-7.2ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/libpoldiff.a
/usr/share/
/usr/share/doc/
/usr/share/doc/libpoldiff-dev/
/usr/share/doc/libpoldiff-dev/copyright
/usr/include/
/usr/include/poldiff/
/usr/include/poldiff/rbac_diff.h
/usr/include/poldiff/terule_diff.h
/usr/include/poldiff/user_diff.h
/usr/include/poldiff/role_diff.h
/usr/include/poldiff/attrib_diff.h
/usr/include/poldiff/type_diff.h
/usr/include/poldiff/component_record.h
/usr/include/poldiff/cat_diff.h
/usr/include/poldiff/range_trans_diff.h
/usr/include/poldiff/avrule_diff.h
/usr/include/poldiff/type_map.h
/usr/include/poldiff/bool_diff.h
/usr/include/poldiff/poldiff.h
/usr/include/poldiff/level_diff.h
/usr/include/poldiff/class_diff.h
/usr/include/poldiff/range_diff.h
/usr/include/poldiff/util.h
/usr/lib/
/usr/share/doc/libpoldiff-dev/KNOWN-BUGS.gz
/usr/share/doc/libpoldiff-dev/README.gz
/usr/share/doc/libpoldiff-dev/NEWS.gz
/usr/share/doc/libpoldiff-dev/TODO.gz
/usr/share/doc/libpoldiff-dev/changelog.Debian.gz
/usr/lib/libpoldiff.so