[Johannes Schauer] > Old sbuild will not help you. The problem is mainly, that older > chroots contain an apt installation that has no support for the > [trusted=yes] option in sources.list.
So if someone really needs this, I guess a workaround would be to backport apt 1.0 to squeeze...? Yes, it would pollute the chroot for rdepends of libapt, but those don't seem like the sorts of packages most people would be building or rebuilding for squeeze. (I could be wrong.)