/usr/share/acl2-6.5/books/rtl/rel1/ is in acl2-books-source 6.5-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-6.5/books/rtl/rel1/lib1/
/usr/share/acl2-6.5/books/rtl/rel1/lib1/basic.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/bits.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/brat.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/float.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/reps.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/round.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib1/top.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/
/usr/share/acl2-6.5/books/rtl/rel1/lib3/basic.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/bits.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/brat.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/fadd.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/float.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/reps.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/round.lisp
/usr/share/acl2-6.5/books/rtl/rel1/lib3/top.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/
/usr/share/acl2-6.5/books/rtl/rel1/support/add.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/away.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/basic.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/divsqrt.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/add3.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/lop1.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/lop2.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/lop3.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/stick.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fadd/top.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/float.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/floor.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/fp.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/logdefs.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/loglemmas.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/logxor-def.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/logxor-lemmas.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/merge.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/near.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/odd.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/proofs.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/reps.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/rewrite-theory.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/rnd.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/sticky.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/trunc.lisp
/usr/share/acl2-6.5/books/rtl/rel1/support/x-2xx.lisp