commit 5481d0b4036b33b92c372ee36258ed11bff57d5d
Author: Jakub Jelen <jjelen@redhat.com>
Date:   Thu Feb 27 10:07:33 2020 +0100

    Mark the RDomain configuration option unsupported on non-openbsd builds

diff --git a/servconf.c b/servconf.c
index db80e943..153d2525 100644
--- a/servconf.c
+++ b/servconf.c
@@ -698,7 +698,11 @@ static struct {
 	{ "fingerprinthash", sFingerprintHash, SSHCFG_GLOBAL },
 	{ "disableforwarding", sDisableForwarding, SSHCFG_ALL },
 	{ "exposeauthinfo", sExposeAuthInfo, SSHCFG_ALL },
+#if defined(__OpenBSD__)
 	{ "rdomain", sRDomain, SSHCFG_ALL },
+#else
+	{ "rdomain", sUnsupported, SSHCFG_ALL },
+#endif
 	{ "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL },
 	{ NULL, sBadOption, 0 }
 };
@@ -2841,7 +2845,9 @@ dump_config(ServerOptions *o)
 	    o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG);
 	dump_cfg_string(sPubkeyAcceptedKeyTypes, o->pubkey_key_types ?
 	    o->pubkey_key_types : KEX_DEFAULT_PK_ALG);
+#if defined(__OpenBSD__)
 	dump_cfg_string(sRDomain, o->routing_domain);
+#endif
 
 	/* string arguments requiring a lookup */
 	dump_cfg_string(sLogLevel, log_level_name(o->log_level));
diff --git a/sshd_config.5 b/sshd_config.5
index 5dca8981..766e9b90 100644
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -1542,6 +1542,7 @@ will be bound to this
 If the routing domain is set to
 .Cm \&%D ,
 then the domain in which the incoming connection was received will be applied.
+This feature is available on OpenBSD only.
 .It Cm SetEnv
 Specifies one or more environment variables to set in child sessions started
 by