Quoth igor@9lab.org:
> Vnc connections to recent Darwin releases fail as follows:
> 
>   % vncv steve.9lab.home
>   vncv: authentication failure: unknown auth type 0x51e2124
> 
> The below inline patch enables connections to recent Darwin versions,
> tested on MacOS Catalina and Big Sur.  The patch is attached as well
> to ease git/import.

The man page could use an update, too.  Other versions have been
supported for awhile: see attached.

I don't know if it's appropriate to mention in the man page that the
connection to OS X cannot be encrypted, so tunneling w/ssh is advised.