-include <file>

[Stephen Weeks]

> I  would  say that the best solution is to just use angle brackets instead of
> double quotes, and mention that that is what we do.  Then if some  one  wants
> to  use  a  .h  file  in their current directory, they can just add the `-I.'
> option.  This will keep them from getting junk in /tmp and will also be  what
> they would expect from the fact that it is angle brackets.

Done.  I have updated the man pages and user guide as well.