Index: etc/defaults/rc.conf
===================================================================
--- etc/defaults/rc.conf
+++ etc/defaults/rc.conf
@@ -325,6 +325,7 @@
 nfs_access_cache="60"		# Client cache timeout in seconds
 nfs_server_enable="NO"		# This host is an NFS server (or NO).
 nfs_server_flags="-u -t"	# Flags to nfsd (if enabled).
+nfs_server_managegids="NO"	# The NFS server maps gids for AUTH_SYS (or NO).
 mountd_enable="NO"		# Run mountd (or NO).
 mountd_flags="-r"		# Flags to mountd (if NFS server enabled).
 weak_mountd_authentication="NO"	# Allow non-root mount requests to be served.
Index: etc/rc.d/nfsd
===================================================================
--- etc/rc.d/nfsd
+++ etc/rc.d/nfsd
@@ -32,10 +32,13 @@
 		sysctl vfs.nfsd.nfs_privport=0 > /dev/null
 	fi
 
-	if checkyesno nfsv4_server_enable; then
+	if checkyesno nfsv4_server_enable || \
+	    checkyesno nfs_server_managegids; then
 		sysctl vfs.nfsd.server_max_nfsvers=4 > /dev/null
 		force_depend nfsuserd || err 1 "Cannot run nfsuserd"
-	else
+	fi
+
+	if ! checkyesno nfsv4_server_enable; then
 		echo 'NFSv4 is disabled'
 		sysctl vfs.nfsd.server_max_nfsvers=3 > /dev/null
 	fi
Index: etc/rc.d/nfsuserd
===================================================================
--- etc/rc.d/nfsuserd
+++ etc/rc.d/nfsuserd
@@ -15,5 +15,14 @@
 sig_stop="USR1"
 
 load_rc_config $name
+start_precmd="nfsuserd_precmd"
+
+nfsuserd_precmd()
+{
+	if checkyesno nfs_server_managegids; then
+		rc_flags="-manage-gids ${nfsuserd_flags}"
+	fi
+	return 0
+}
 
 run_rc_command "$1"