/usr/share/acl2-7.1/books/xdoc/ is in acl2-books 7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.1/books/xdoc/autolink.o
/usr/share/acl2-7.1/books/xdoc/base.o
/usr/share/acl2-7.1/books/xdoc/book-thms.o
/usr/share/acl2-7.1/books/xdoc/display.o
/usr/share/acl2-7.1/books/xdoc/fmt-to-str-orig.o
/usr/share/acl2-7.1/books/xdoc/fmt-to-str.o
/usr/share/acl2-7.1/books/xdoc/names.o
/usr/share/acl2-7.1/books/xdoc/parse-xml.o
/usr/share/acl2-7.1/books/xdoc/prepare-topic.o
/usr/share/acl2-7.1/books/xdoc/preprocess.o
/usr/share/acl2-7.1/books/xdoc/spellcheck.o
/usr/share/acl2-7.1/books/xdoc/str.o
/usr/share/acl2-7.1/books/xdoc/top.o
/usr/share/acl2-7.1/books/xdoc/unsound-eval-raw.o
/usr/share/acl2-7.1/books/xdoc/unsound-eval.o
/usr/share/acl2-7.1/books/xdoc/verbosep.o
/usr/share/acl2-7.1/books/xdoc/word-wrap.o