+m4_dnl This file is part of ipif, part of userv-utils
+m4_dnl
+m4_dnl Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
+m4_dnl Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+m4_dnl Copyright 1999,2003
+m4_dnl Chancellor Masters and Scholars of the University of Cambridge
+m4_dnl Copyright 2010 Tony Finch <fanf@dotat.at>
+m4_dnl