/usr/lib/swi-prolog/library/clp/ is in swi-prolog-nox 7.6.4+dfsg-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/swi-prolog/library/clp/bounds.pl
/usr/lib/swi-prolog/library/clp/clp_distinct.pl
/usr/lib/swi-prolog/library/clp/clp_events.pl
/usr/lib/swi-prolog/library/clp/clpb.pl
/usr/lib/swi-prolog/library/clp/clpfd.pl
/usr/lib/swi-prolog/library/clp/clpq/
/usr/lib/swi-prolog/library/clp/clpq.pl
/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/
/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/highlight.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
/usr/lib/swi-prolog/library/clp/clpr/
/usr/lib/swi-prolog/library/clp/clpr.pl
/usr/lib/swi-prolog/library/clp/clpr/bb_r.pl
/usr/lib/swi-prolog/library/clp/clpr/bv_r.pl
/usr/lib/swi-prolog/library/clp/clpr/fourmotz_r.pl
/usr/lib/swi-prolog/library/clp/clpr/ineq_r.pl
/usr/lib/swi-prolog/library/clp/clpr/itf_r.pl
/usr/lib/swi-prolog/library/clp/clpr/nf_r.pl
/usr/lib/swi-prolog/library/clp/clpr/store_r.pl
/usr/lib/swi-prolog/library/clp/simplex.pl