I attempted instead to build from the tar ball, and, except for a "fatal" git error, make built elogd, elog, and elconv.  I put the first in /usr/local/sbin, and the latter two in /usr/local/bin, and then restarted elogd, but this didn't work:

Service Temporarily Unavailable

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

So, I backed these out and restored the previous executables, and access to the elog was restored, and the elogd.cfg accessed is the original one, but all logbooks are empty and requiring authentication.  The logbook directories still contain all the old entries, so I'm not sure what has happened.

Thanks for your advice.

Phil