/usr/share/acl2-6.3/books/cutil/ is in acl2-books-source 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/cutil/cert.acl2
/usr/share/acl2-6.3/books/cutil/da-base.lisp
/usr/share/acl2-6.3/books/cutil/defaggregate-tests.lisp
/usr/share/acl2-6.3/books/cutil/defaggregate.lisp
/usr/share/acl2-6.3/books/cutil/defalist-tests.lisp
/usr/share/acl2-6.3/books/cutil/defalist.lisp
/usr/share/acl2-6.3/books/cutil/defenum.lisp
/usr/share/acl2-6.3/books/cutil/define-tests.acl2
/usr/share/acl2-6.3/books/cutil/define-tests.lisp
/usr/share/acl2-6.3/books/cutil/define.lisp
/usr/share/acl2-6.3/books/cutil/deflist-aux.lisp
/usr/share/acl2-6.3/books/cutil/deflist-tests.lisp
/usr/share/acl2-6.3/books/cutil/deflist.lisp
/usr/share/acl2-6.3/books/cutil/defmapappend-tests.lisp
/usr/share/acl2-6.3/books/cutil/defmapappend.lisp
/usr/share/acl2-6.3/books/cutil/defmvtypes.lisp
/usr/share/acl2-6.3/books/cutil/defprojection-tests.acl2
/usr/share/acl2-6.3/books/cutil/defprojection-tests.lisp
/usr/share/acl2-6.3/books/cutil/defprojection.lisp
/usr/share/acl2-6.3/books/cutil/defredundant-tests.lisp
/usr/share/acl2-6.3/books/cutil/defredundant.lisp
/usr/share/acl2-6.3/books/cutil/defrule.lisp
/usr/share/acl2-6.3/books/cutil/formals.lisp
/usr/share/acl2-6.3/books/cutil/look-up.lisp
/usr/share/acl2-6.3/books/cutil/maybe-defthm.lisp
/usr/share/acl2-6.3/books/cutil/portcullis.acl2
/usr/share/acl2-6.3/books/cutil/portcullis.lisp
/usr/share/acl2-6.3/books/cutil/returnspecs.lisp
/usr/share/acl2-6.3/books/cutil/support.lisp
/usr/share/acl2-6.3/books/cutil/tools/
/usr/share/acl2-6.3/books/cutil/tools/assert-return-thms.lisp
/usr/share/acl2-6.3/books/cutil/tools/cert.acl2
/usr/share/acl2-6.3/books/cutil/top.acl2
/usr/share/acl2-6.3/books/cutil/top.lisp
/usr/share/acl2-6.3/books/cutil/wizard.lisp