> Well, it's actually patch that does the job (sort of). I have never gotten > a diff file to actually produce the upstream source from the Debian > source. Patch does ask if you wish to reverse the patch, but as often as Patch can't quite guess right for the "new file" diffs, which look the same as an insertion with no context might, so it doesn't prompt you for those files. If you do an explicit "patch -R" the right thing should happen.