/usr/share/acl2-6.3/books/oslib/ is in acl2-books-source 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/oslib/argv.lisp
/usr/share/acl2-6.3/books/oslib/catpath.lisp
/usr/share/acl2-6.3/books/oslib/cert.acl2
/usr/share/acl2-6.3/books/oslib/date.lisp
/usr/share/acl2-6.3/books/oslib/file-types.lisp
/usr/share/acl2-6.3/books/oslib/getpid.lisp
/usr/share/acl2-6.3/books/oslib/logic-defs.lisp
/usr/share/acl2-6.3/books/oslib/ls.lisp
/usr/share/acl2-6.3/books/oslib/mkdir.lisp
/usr/share/acl2-6.3/books/oslib/portcullis.acl2
/usr/share/acl2-6.3/books/oslib/portcullis.lisp
/usr/share/acl2-6.3/books/oslib/read-acl2-oracle.lisp
/usr/share/acl2-6.3/books/oslib/rmtree.lisp
/usr/share/acl2-6.3/books/oslib/tempfile.lisp
/usr/share/acl2-6.3/books/oslib/top.lisp