Unable to set userid in AIX 3.2.5

[Paulo Henrique Mascarenhas SantAnna]

  I'm trying to share a UNIX directory among users accesing it from
Win95 boxes. I'm using the "force user" directive but it seems to
not work under AIX 3.2.5. I got the message in the logs:

 Can't set uid (AIX3)

 Grepping around I found that this message comes from the
module uid.c.Before I start to mess up the code, I want to
know: There is any workaround for that?

 Regards,

 -- Paulo Henrique

P.S: Sorry if this is a FAQ but I found nothing in the Samba 
docs.