/usr/share/acl2-4.3/books/cutil/ is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-4.3/books/cutil/cert.acl2
/usr/share/acl2-4.3/books/cutil/defaggregate-opt.acl2
/usr/share/acl2-4.3/books/cutil/defaggregate-opt.lisp
/usr/share/acl2-4.3/books/cutil/defaggregate.lisp
/usr/share/acl2-4.3/books/cutil/defalist-tests.lisp
/usr/share/acl2-4.3/books/cutil/defalist.lisp
/usr/share/acl2-4.3/books/cutil/defenum.lisp
/usr/share/acl2-4.3/books/cutil/deflist-aux.lisp
/usr/share/acl2-4.3/books/cutil/deflist-tests.lisp
/usr/share/acl2-4.3/books/cutil/deflist.lisp
/usr/share/acl2-4.3/books/cutil/defmapappend-tests.lisp
/usr/share/acl2-4.3/books/cutil/defmapappend.lisp
/usr/share/acl2-4.3/books/cutil/defmvtypes.lisp
/usr/share/acl2-4.3/books/cutil/defprojection-tests.acl2
/usr/share/acl2-4.3/books/cutil/defprojection-tests.lisp
/usr/share/acl2-4.3/books/cutil/defprojection.lisp
/usr/share/acl2-4.3/books/cutil/defsection.lisp
/usr/share/acl2-4.3/books/cutil/portcullis.acl2
/usr/share/acl2-4.3/books/cutil/portcullis.lisp
/usr/share/acl2-4.3/books/cutil/top-opt.acl2
/usr/share/acl2-4.3/books/cutil/top-opt.lisp
/usr/share/acl2-4.3/books/cutil/top.lisp