6.2p1 has become noisy, I was getting reports like this on my term:
no such identity: /home/ken/.ssh/id_rsa: No such file or directory no such identity: /home/ken/.ssh/id_ecdsa: No such file or directory
This can be quietened:
echo "LogLevel ERROR" >>.ssh/config chmod 600 .ssh/config
In a normal install by root, the keys at /etc/ssh are either created or, if already present, not updated. Attempting to run a DESTDIR install as a regular user fails because the keys cannot be read. Done as root, a DESTDIR install (upgrading an older version) works. No doubt an initial DESTDIR install by root would also create /etc/ssh.
In OpenSSH 8.x, some of the test like (regress/agent-getpeereid.sh) require a SUDO environment variable in uppercase pointing to sudo.