Andreas KusalanandaKähäri wrote: > I'll try copying from an existing installation, and if that proves to be > too problematic, I guess I just have to check out the OPENBSD_6_1 branch > and build a new release (which I really had hoped I would not have to > do).
There's nothing magic about the "patch" files, they're just a tgz with updated files in them. The syspatch command does some nice things like saving old files for rollback, and downloading and verifying the contents, but if you look in http://ftp.openbsd.org/pub/OpenBSD/syspatch/6.1/amd64/ it shouldn't be too hard to work out your own procedure. You're on your own, but it may be easier than building src from scratch.

