#515 in the CHANGES file states:

Added a "sudo_lecture" option that points to a file containing a custom lecture.

That file is the only one in the 1.6.8p1 distribution that contains any
reference to it.

--with-lecture_file  should be referenced for more clarity.. the only real way
to find that is to trace it back to the def_data.in file.. or read the man page
after installation.. but that doesn't help for a configure option. (In fact..
while you can use this option, it doesn't actually appear to do anything.. you
must define it in your sudoers Default section)

It seems to be documented properly in the MAN page.. it doesn't exist in
./configure --help, and it's wrong in the CHANGES file..  Perhaps it doesn't
exist in configure because it's not suppose to allow you to set it there.. So
perhaps it just needs to complain that it isn't an option, or allow for it to be
set from here?

Thanks