/usr/share/acl2-4.3/books/wp-gen/ is in acl2-books-source 4.3-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-4.3/books/wp-gen/examples/
/usr/share/acl2-4.3/books/wp-gen/examples/false-prog.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/new-program.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/new-program2.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/pcode.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/sum-simple-wrong.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/sum-simple.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/sum-simpler.lisp
/usr/share/acl2-4.3/books/wp-gen/examples/sum.lisp
/usr/share/acl2-4.3/books/wp-gen/mutrec/
/usr/share/acl2-4.3/books/wp-gen/mutrec/mutrec.lisp
/usr/share/acl2-4.3/books/wp-gen/shared.lisp
/usr/share/acl2-4.3/books/wp-gen/wp-gen.acl2
/usr/share/acl2-4.3/books/wp-gen/wp-gen.lisp