diff -up openssh-8.6p1/sshd.c.log-usepam-no openssh-8.6p1/sshd.c

--- openssh-8.6p1/sshd-session.c.log-usepam-no	2021-04-19 14:00:45.099735129 +0200

+++ openssh-8.6p1/sshd-session.c	2021-04-19 14:03:21.140920974 +0200

@@ -1749,6 +1749,10 @@ main(int ac, char **av)

 			    "enabled authentication methods");

 	}

+	/* 'UsePAM no' is not supported in our builds */

+	if (! options.use_pam)

+		logit("WARNING: 'UsePAM no' is not supported in this build and may cause several problems.");

+

 #ifdef WITH_OPENSSL

 	if (options.moduli_file != NULL)

 		dh_set_moduli_file(options.moduli_file);

diff -up openssh-8.6p1/sshd_config.log-usepam-no openssh-8.6p1/sshd_config

--- openssh-8.6p1/sshd_config.log-usepam-no	2021-04-19 14:00:45.098735121 +0200

+++ openssh-8.6p1/sshd_config	2021-04-19 14:00:45.099735129 +0200

@@ -87,6 +87,8 @@ AuthorizedKeysFile	.ssh/authorized_keys

 # If you just want the PAM account and session checks to run without

 # PAM authentication, then enable this but set PasswordAuthentication

 # and KbdInteractiveAuthentication to 'no'.

+# WARNING: 'UsePAM no' is not supported in this build and may cause several

+# problems.

 #UsePAM no

 #AllowAgentForwarding yes