On the server side: # strace -fp 28697 2>&1|grep xauth Client side: # ssh -Yv server [...] debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: Requesting X11 forwarding with authentication spoofing. debug1: Requesting authentication agent forwarding. debug1: Remote: No xauth program; cannot forward with spoofing. X11 forwarding request failed on channel 0 server ~ # [pid 29178] stat("${EPREFIX}/usr/bin/xauth", 0x7fffa92b5f80) = -1 ENOENT (No such file or directory) I suspect line 92 of openssh-6.2_p2-r1.ebuild to be at fault (improper quoting)
Fixed in 6.2_p2-r2.