hplip and avahi-enabled cups-base

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello,
when cups-base is built with avahi-support, hplip fails to build because
the ahavi libraries are not in the buildlink directory (havali libs are
pulled in by libtool from cups's libraries I guess).
Adding
.include "../../net/avahi/buildlink3.mk"

to hplip's Makefile fixes it, but it needs to be done only when cups is
built with avahi support. how can I do that ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--