/usr/share/acl2-6.3/books/fix-cert/ is in acl2-books-source 6.3-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.3/books/fix-cert/fix-cert.acl2
/usr/share/acl2-6.3/books/fix-cert/fix-cert.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/
/usr/share/acl2-6.3/books/fix-cert/moved/test1.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1b.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1bb.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1bp.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1p.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1pb.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test1pp.lisp
/usr/share/acl2-6.3/books/fix-cert/moved/test2.lisp
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert0.acl2
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert0.lisp
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert1.acl2
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert1.lisp
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert2.acl2
/usr/share/acl2-6.3/books/fix-cert/test-fix-cert2.lisp
/usr/share/acl2-6.3/books/fix-cert/test1.acl2
/usr/share/acl2-6.3/books/fix-cert/test1.lisp
/usr/share/acl2-6.3/books/fix-cert/test1b.acl2
/usr/share/acl2-6.3/books/fix-cert/test1b.lisp
/usr/share/acl2-6.3/books/fix-cert/test1bb.acl2
/usr/share/acl2-6.3/books/fix-cert/test1bb.lisp
/usr/share/acl2-6.3/books/fix-cert/test1bp.acl2
/usr/share/acl2-6.3/books/fix-cert/test1bp.lisp
/usr/share/acl2-6.3/books/fix-cert/test1p.acl2
/usr/share/acl2-6.3/books/fix-cert/test1p.lisp
/usr/share/acl2-6.3/books/fix-cert/test1pb.acl2
/usr/share/acl2-6.3/books/fix-cert/test1pb.lisp
/usr/share/acl2-6.3/books/fix-cert/test1pp.acl2
/usr/share/acl2-6.3/books/fix-cert/test1pp.lisp
/usr/share/acl2-6.3/books/fix-cert/test2.acl2
/usr/share/acl2-6.3/books/fix-cert/test2.lisp