/usr/share/acl2-4.3/books/centaur/misc/ is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-4.3/books/centaur/misc/alist-defs.lisp
/usr/share/acl2-4.3/books/centaur/misc/alist-equiv.lisp
/usr/share/acl2-4.3/books/centaur/misc/ap.lisp
/usr/share/acl2-4.3/books/centaur/misc/defapply.lisp
/usr/share/acl2-4.3/books/centaur/misc/equal-sets.acl2
/usr/share/acl2-4.3/books/centaur/misc/equal-sets.lisp
/usr/share/acl2-4.3/books/centaur/misc/evaluator-metatheorems.lisp
/usr/share/acl2-4.3/books/centaur/misc/f-put-global.lisp
/usr/share/acl2-4.3/books/centaur/misc/fast-alists.lisp
/usr/share/acl2-4.3/books/centaur/misc/hons-extra.lisp
/usr/share/acl2-4.3/books/centaur/misc/hons-sets.lisp
/usr/share/acl2-4.3/books/centaur/misc/interp-function-lookup.lisp
/usr/share/acl2-4.3/books/centaur/misc/ls.lisp
/usr/share/acl2-4.3/books/centaur/misc/memory-mgmt-logic.lisp
/usr/share/acl2-4.3/books/centaur/misc/memory-mgmt-raw.lisp
/usr/share/acl2-4.3/books/centaur/misc/sneaky-load.lisp
/usr/share/acl2-4.3/books/centaur/misc/universal-equiv.lisp
/usr/share/acl2-4.3/books/centaur/misc/vecs-ints.lisp
/usr/share/acl2-4.3/books/centaur/misc/witness-cp.acl2
/usr/share/acl2-4.3/books/centaur/misc/witness-cp.lisp