/usr/share/acl2-6.3/books/defexec/other-apps/ is in acl2-books-certs 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/defexec/other-apps/misc/
/usr/share/acl2-6.3/books/defexec/other-apps/misc/memos.cert
/usr/share/acl2-6.3/books/defexec/other-apps/misc/stobjsim.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/extraction.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/final-theorem.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/first-last.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/intermediate-program.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/intermediate-to-spec.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/load-extract.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/merge-intermediate.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/nth-update-nth.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/permutations.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/programs.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/sort-qs-properties.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/spec-properties.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/split-qs-properties.cert
/usr/share/acl2-6.3/books/defexec/other-apps/qsort/total-order.cert
/usr/share/acl2-6.3/books/defexec/other-apps/records/
/usr/share/acl2-6.3/books/defexec/other-apps/records/inline.cert
/usr/share/acl2-6.3/books/defexec/other-apps/records/records-bsd.cert
/usr/share/acl2-6.3/books/defexec/other-apps/records/records.cert
/usr/share/acl2-6.3/books/defexec/other-apps/records/recordsim.cert