diff -up openssh-6.1p1/configure.ac.vendor openssh-6.1p1/configure.ac
--- openssh-6.1p1/configure.ac.vendor	2012-09-14 20:36:49.153085211 +0200
+++ openssh-6.1p1/configure.ac	2012-09-14 20:36:49.559088133 +0200
@@ -4303,6 +4303,12 @@ AC_ARG_WITH([lastlog],
 		fi
 	]
 )
+AC_ARG_ENABLE(vendor-patchlevel,
+  [  --enable-vendor-patchlevel=TAG  specify a vendor patch level],
+  [AC_DEFINE_UNQUOTED(SSH_VENDOR_PATCHLEVEL,[SSH_RELEASE "-" "$enableval"],[Define to your vendor patch level, if it has been modified from the upstream source release.])
+   SSH_VENDOR_PATCHLEVEL="$enableval"],
+  [AC_DEFINE(SSH_VENDOR_PATCHLEVEL,SSH_RELEASE,[Define to your vendor patch level, if it has been modified from the upstream source release.])
+   SSH_VENDOR_PATCHLEVEL=none])
 
 dnl lastlog, [uw]tmpx? detection
 dnl  NOTE: set the paths in the platform section to avoid the
@@ -4529,6 +4535,7 @@ echo "           Translate v4 in v6 hack
 echo "                  BSD Auth support: $BSD_AUTH_MSG"
 echo "              Random number source: $RAND_MSG"
 echo "             Privsep sandbox style: $SANDBOX_STYLE"
+echo "                Vendor patch level: $SSH_VENDOR_PATCHLEVEL"
 
 echo ""
 
diff -up openssh-6.1p1/servconf.c.vendor openssh-6.1p1/servconf.c
--- openssh-6.1p1/servconf.c.vendor	2012-09-14 20:36:49.124085002 +0200
+++ openssh-6.1p1/servconf.c	2012-09-14 20:50:34.995972516 +0200
@@ -128,6 +128,7 @@ initialize_server_options(ServerOptions
 	options->max_authtries = -1;
 	options->max_sessions = -1;
 	options->banner = NULL;
+	options->show_patchlevel = -1;
 	options->use_dns = -1;
 	options->client_alive_interval = -1;
 	options->client_alive_count_max = -1;
@@ -289,6 +290,9 @@ fill_default_server_options(ServerOption
 		options->ip_qos_bulk = IPTOS_THROUGHPUT;
 	if (options->version_addendum == NULL)
 		options->version_addendum = xstrdup("");
+	if (options->show_patchlevel == -1)
+		options->show_patchlevel = 0;
+
 	/* Turn privilege separation on by default */
 	if (use_privsep == -1)
 		use_privsep = PRIVSEP_NOSANDBOX;
@@ -326,7 +330,7 @@ typedef enum {
 	sIgnoreUserKnownHosts, sCiphers, sMacs, sProtocol, sPidFile,
 	sGatewayPorts, sPubkeyAuthentication, sXAuthLocation, sSubsystem,
 	sMaxStartups, sMaxAuthTries, sMaxSessions,
-	sBanner, sUseDNS, sHostbasedAuthentication,
+	sBanner, sShowPatchLevel, sUseDNS, sHostbasedAuthentication,
 	sHostbasedUsesNameFromPacketOnly, sClientAliveInterval,
 	sClientAliveCountMax, sAuthorizedKeysFile,
 	sGssAuthentication, sGssCleanupCreds, sAcceptEnv, sPermitTunnel,
@@ -441,6 +445,7 @@ static struct {
 	{ "maxauthtries", sMaxAuthTries, SSHCFG_ALL },
 	{ "maxsessions", sMaxSessions, SSHCFG_ALL },
 	{ "banner", sBanner, SSHCFG_ALL },
+	{ "showpatchlevel", sShowPatchLevel, SSHCFG_GLOBAL },
 	{ "usedns", sUseDNS, SSHCFG_GLOBAL },
 	{ "verifyreversemapping", sDeprecated, SSHCFG_GLOBAL },
 	{ "reversemappingcheck", sDeprecated, SSHCFG_GLOBAL },
@@ -1162,6 +1167,10 @@ process_server_config_line(ServerOptions
 		multistate_ptr = multistate_privsep;
 		goto parse_multistate;
 
+	case sShowPatchLevel:
+		intptr = &options->show_patchlevel;
+		goto parse_flag;
+
 	case sAllowUsers:
 		while ((arg = strdelim(&cp)) && *arg != '\0') {
 			if (options->num_allow_users >= MAX_ALLOW_USERS)
@@ -1956,6 +1965,7 @@ dump_config(ServerOptions *o)
 	dump_cfg_fmtint(sUseLogin, o->use_login);
 	dump_cfg_fmtint(sCompression, o->compression);
 	dump_cfg_fmtint(sGatewayPorts, o->gateway_ports);
+	dump_cfg_fmtint(sShowPatchLevel, o->show_patchlevel);
 	dump_cfg_fmtint(sUseDNS, o->use_dns);
 	dump_cfg_fmtint(sAllowTcpForwarding, o->allow_tcp_forwarding);
 	dump_cfg_fmtint(sUsePrivilegeSeparation, use_privsep);
diff -up openssh-6.1p1/servconf.h.vendor openssh-6.1p1/servconf.h
--- openssh-6.1p1/servconf.h.vendor	2012-09-14 20:36:49.125085009 +0200
+++ openssh-6.1p1/servconf.h	2012-09-14 20:36:49.564088168 +0200
@@ -140,6 +140,7 @@ typedef struct {
 	int	max_authtries;
 	int	max_sessions;
 	char   *banner;			/* SSH-2 banner message */
+	int	show_patchlevel;	/* Show vendor patch level to clients */
 	int	use_dns;
 	int	client_alive_interval;	/*
 					 * poke the client this often to
diff -up openssh-6.1p1/sshd_config.vendor openssh-6.1p1/sshd_config
--- openssh-6.1p1/sshd_config.vendor	2012-09-14 20:36:49.507087759 +0200
+++ openssh-6.1p1/sshd_config	2012-09-14 20:36:49.565088175 +0200
@@ -114,6 +114,7 @@ UsePrivilegeSeparation sandbox		# Defaul
 #Compression delayed
 #ClientAliveInterval 0
 #ClientAliveCountMax 3
+#ShowPatchLevel no
 #UseDNS yes
 #PidFile /var/run/sshd.pid
 #MaxStartups 10
diff -up openssh-6.1p1/sshd_config.0.vendor openssh-6.1p1/sshd_config.0
--- openssh-6.1p1/sshd_config.0.vendor	2012-09-14 20:36:49.510087780 +0200
+++ openssh-6.1p1/sshd_config.0	2012-09-14 20:36:49.567088190 +0200
@@ -558,6 +558,11 @@ DESCRIPTION
              Defines the number of bits in the ephemeral protocol version 1
              server key.  The minimum value is 512, and the default is 1024.
 
+     ShowPatchLevel
+	     Specifies whether sshd will display the specific patch level of
+	     the binary in the server identification string.  The patch level
+	     is set at compile-time.  The default is M-bM-^@M-^\noM-bM-^@M-^].
+
      StrictModes
              Specifies whether sshd(8) should check file modes and ownership
              of the user's files and home directory before accepting login.
diff -up openssh-6.1p1/sshd_config.5.vendor openssh-6.1p1/sshd_config.5
--- openssh-6.1p1/sshd_config.5.vendor	2012-09-14 20:36:49.512087794 +0200
+++ openssh-6.1p1/sshd_config.5	2012-09-14 20:36:49.568088198 +0200
@@ -978,6 +978,14 @@ This option applies to protocol version
 .It Cm ServerKeyBits
 Defines the number of bits in the ephemeral protocol version 1 server key.
 The minimum value is 512, and the default is 1024.
+.It Cm ShowPatchLevel 
+Specifies whether 
+.Nm sshd 
+will display the patch level of the binary in the identification string. 
+The patch level is set at compile-time. 
+The default is 
+.Dq no . 
+This option applies to protocol version 1 only. 
 .It Cm StrictModes
 Specifies whether
 .Xr sshd 8
diff -up openssh-6.1p1/sshd.c.vendor openssh-6.1p1/sshd.c
--- openssh-6.1p1/sshd.c.vendor	2012-09-14 20:36:49.399086981 +0200
+++ openssh-6.1p1/sshd.c	2012-09-14 20:47:30.696088744 +0200
@@ -433,7 +433,7 @@ sshd_exchange_identification(int sock_in
 	}
 
 	xasprintf(&server_version_string, "SSH-%d.%d-%.100s%s%s%s",
-	    major, minor, SSH_VERSION,
+	    major, minor, (options.show_patchlevel == 1) ? SSH_VENDOR_PATCHLEVEL : SSH_VERSION,
 	    *options.version_addendum == '\0' ? "" : " ",
 	    options.version_addendum, newline);
 
@@ -1635,7 +1635,8 @@ main(int ac, char **av)
 		exit(1);
 	}
 
-	debug("sshd version %.100s", SSH_RELEASE);
+	debug("sshd version %.100s",
+	      (options.show_patchlevel == 1) ? SSH_VENDOR_PATCHLEVEL : SSH_RELEASE);
 
 	/* Store privilege separation user for later use if required. */
 	if ((privsep_pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) {