fixinc w/ SYSTEM_INCLUDE_DIR set?

[Jeffrey A Law]

  In message < 19980803020222.D12433@dgii.com >you write:
  > > I think what I need to be able to do is to set SYSTEM_HEADER_DIR in
  > > Makefile.in from within configure.  I don't see any mechanism in there
  > > to do this.  Is the right thing to do just to add the plumbing in
  > > configure.in to AC_SUBST() it into the generated Makefile?
  > 
  > This turns out to be trivial to do, but it still feels wrong.  Here's
  > one possible implementation.  Suggestions for better approaches welcome.
I missed (ie lost) the discussion on this.  Why exactly did you need
to override SYSTEM_HEADER_DIR?

jeff