Samba - Winbind - S390

Hi List,

I have a RedHat 7.2 running on a S390 with Samba 2.2.1a-5....
I need to use the winbind service on it in order to it works together with
Samba 
but it doesn't appear...

Anybody knows where can I find this service or package (winbind) for Samba
2.2.1a-5 on S390?

Please I really need your help because I've spent a lot of time looking for
it 
but I still haven't could find it

Thanks in advance

Leonardo