/usr/share/acl2-7.2dfsg/books/misc/dead-events.lisp is in acl2-books-source 7.2dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | (in-package "ACL2")
;; The following line marks this book as a relocation stub:
;; cert_param: (reloc_stub)
(include-book "tools/dead-events" :dir :system)
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