7/15    Has anyone successfully upgraded from FreeBSD 4.x to 5.1?  I'm
        running into trouble with doing a make buildworld from cvsup on
        libpthread, which seems to be a known problem dating back to
        May or June judging from the mailing lists, but I can't find a
        solution.  Binary upgrades don't work, according to UPGRADE.TXT -John
        \_ I was planning to move to 5.1 myself, but I wasn't planning on an
           upgrade.  You're moving across versions to a non-STABLE release...
           isn't it time to wipe & reinstall all your old packages anyway?
           I'm really only replying because I'm curious about your primary
           reason for choosing the upgrade path-- maybe it applies to me.
        \_ Yes.  It wasn't a problem.  Over time I upped my 4.4 -> 4.6 -> 4.7
           -> 4.8 -> 5.0 -> 5.1.  Trivial.