/usr/lib/swi-prolog/library/clp/clpq/ is in swi-prolog-nox 6.6.4-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/swi-prolog/library/clp/clpq/bb_q.pl
/usr/lib/swi-prolog/library/clp/clpq/bv_q.pl
/usr/lib/swi-prolog/library/clp/clpq/fourmotz_q.pl
/usr/lib/swi-prolog/library/clp/clpq/ineq_q.pl
/usr/lib/swi-prolog/library/clp/clpq/itf_q.pl
/usr/lib/swi-prolog/library/clp/clpq/nf_q.pl
/usr/lib/swi-prolog/library/clp/clpq/store_q.pl
/usr/lib/swi-prolog/library/clp/clpqr/README
/usr/lib/swi-prolog/library/clp/clpqr/class.pl
/usr/lib/swi-prolog/library/clp/clpqr/dump.pl
/usr/lib/swi-prolog/library/clp/clpqr/geler.pl
/usr/lib/swi-prolog/library/clp/clpqr/itf.pl
/usr/lib/swi-prolog/library/clp/clpqr/ordering.pl
/usr/lib/swi-prolog/library/clp/clpqr/project.pl
/usr/lib/swi-prolog/library/clp/clpqr/redund.pl