files left after distclean: How to clean those?

[bob at proulx dot com (Bob Proulx)]

I am wanting to use help2man to produce the man page for a program.  I
have a Makefile.am with the following.

  dist_man_MANS = example.8

  example.8: src/example
  	 help2man --output=example.8 ./src/example

But when I run 'make distcheck' I get the following error.

  Error: files left after distclean

I am using:

  autoconf (GNU Autoconf) 2.53
  automake (GNU automake) 1.5

I think I understand what is happening and why.  But even after
reading the docs (specifically the sections "What Gets Cleaned" and
"When Automake Isn't Enough") but I am still at a loss as to the
correct way to proceed.  How do I remove the file during a clean?

[Aside: Since this is a normal file to build I would expect the normal
clean to remove it.  But it requires help2man as a build dependency
which may not exist on a developer system.  So perhaps it should be
maintainer-clean-hook.  Hmm...  But if they are a developer then I
will assume them to have all of the development tools available.
Let's not worry for now.  Let's just make it work with either.]

I will be explicit.  Should I put in a distclean-hook: target that
removes this file?  Of course this does not work.  I can't get the
hook to be called by 'make distcheck'.

  distclean-hook:
	rm -f example.8

What is the normal way to handle using help2man to create man pages?
(I am just going to avoid creating man pages for the moment.)

Thanks
Bob