Someone
public text v1 · immutabledebug1: Requesting X11 forwarding with authentication spoofing.
debug1: Requesting authentication agent forwarding.
debug1: Remote: No xauth program; cannot forward with spoofing.
both machines give this...
$ emerge -pv xauth
These are the packages that I would merge, in order:
Calculating dependencies ...done!
[ebuild R ] x11-apps/xauth-0.99.0 0 kB
$ which xauth
/usr/bin/xauth