diff --git a/make-automaps/make-automaps b/make-automaps/make-automaps
index 7cb1168..01d0d57 100755
--- a/make-automaps/make-automaps
+++ b/make-automaps/make-automaps
@@ -5,6 +5,28 @@ use warnings;
 
 chomp (my $hostname=`uname -n`);$hostname=~s/\..*//;
 
+{
+	my %SERVER_CAN_41;
+	sub server_vers_opt {
+		my ($servername)=@_;
+		unless (exists $SERVER_CAN_41{$servername}) {
+			my $pid=fork;
+			if (defined $pid) {
+				unless ($pid) {
+					open STDERR,'>','/dev/null';
+					exec 'hostconfig','--host',$servername,'nfsd41';
+					die "exec failed: $!\n";
+				}
+				wait;
+				$SERVER_CAN_41{$servername} = $? ? 0 : 1;
+			} else {
+				$SERVER_CAN_41{$servername} = 0;
+			}
+		}
+		return $SERVER_CAN_41{$servername} ? () : ('-vers=4.0');
+	}
+}
+
 sub convert_map {
 	my ($amd,$auto,$parse_line)=@_;
 	open IN,'<',$amd or die "$amd: $!\n";
@@ -22,13 +44,13 @@ sub convert_map {
 sub parse_jbod_line {
 		my ($in,$source)=@_;
 		if      ($in=~m"^(X\d+)\s+host==([^;]+);type:=link;fs:=/amd/\2/X/\1 host!=\2;type:=nfs;rhost:=\2;fs:=/amd/\2/x/\1;rfs:=/amd/\2/X/\1$") {
-			return "$1 -vers=4.0 $2:/amd/$2/X/$1";
+			return join(' ',$1,server_vers_opt($2),"$2:/amd/$2/X/$1");
 		} elsif ($in=~m"^(C\d+)\s+host==([^;]+);type:=link;fs:=/amd/\2/C/\1 host!=\2;type:=nfs;rhost:=\2;fs:=/amd/\2/c/\1;rfs:=/amd/\2/C/\1$") {
-			return "$1 -vers=4.0 $2:/amd/$2/C/$1";
+			return join(' ',$1,server_vers_opt($2),"$2:/amd/$2/C/$1");
 		} elsif ($in=~m"^(M\d+)\s+host==([^;]+);type:=link;fs:=/amd/\2/M/\1 host!=\2;type:=nfs;rhost:=\2;fs:=/amd/\2/m/\1;rfs:=/amd/\2/M/\1$") {
-			return "$1 -vers=4.0 $2:/amd/$2/M/$1";
+			return join(' ',$1,server_vers_opt($2),"$2:/amd/$2/M/$1");
 		} elsif ($in=~m"^(X\d+)\s+-fs:=/amd/([^/]+)/X/\1 host==\2;type:=link host!=\2;type:=nfs;rhost:=\2") {
-			return "$1 -vers=4.0 $2:/amd/$2/X/$1";
+			return join(' ',$1,server_vers_opt($2),"$2:/amd/$2/X/$1");
 		} else {
 			warn "?? $source : $_ ??";
 		}
@@ -68,8 +90,8 @@ sub parse_map_line {
 	return ();
 }
 
-sub parse_subkey_line   { my ($key,$host,$fs)=parse_map_line(@_); return $key ? "$key -vers=4.0 $host:$fs/$key" : undef; }
-sub parse_nosubkey_line { my ($key,$host,$fs)=parse_map_line(@_); return $key ? "$key -vers=4.0 $host:$fs" : undef; }
+sub parse_subkey_line   { my ($key,$host,$fs)=parse_map_line(@_); return $key ? join(' ',$key,server_vers_opt($host),"$host:$fs/$key") : undef; }
+sub parse_nosubkey_line { my ($key,$host,$fs)=parse_map_line(@_); return $key ? join(' ',$key,server_vers_opt($host),"$host:$fs") : undef; }
 
 sub create_pkg_map {
 	my $cache;
@@ -82,10 +104,16 @@ sub create_pkg_map {
 		/\S/ or next;
 		my ($pkg,$flags)=split ' ';
 		my $local="/var/pkg/$pkg";
-		my $rw = $flags eq 'BUILD' ? ' -vers=4.0,rw' : ' -vers=4.0';
+		my $rw;
 		if (-d $local) {
+			$rw = $flags eq 'BUILD' ? ' -rw' : '';
 			print $out "$pkg$rw :$local\n";
 		} else {
+			if (server_vers_opt('ex')) {
+				$rw = $flags eq 'BUILD' ? ' -vers=4.0,rw' : ' -vers=4.0';
+			} else{
+				$rw = $flags eq 'BUILD' ? ' -rw' : '';
+			}
 			print $out "$pkg$rw ex:/amd/ex/X/X2008/package/pkg/$pkg\n";
 		}
 	}