[Samba] How do I enable groupname map functionality?

[Eric Boehm]

I can see code in Samba 2.2.7a in source/smbd/groupname.c to do
"groupname map" functionality. I see 

#ifdef USING_GROUPNAME_MAP

but I don't see any option to configure to enable this. Is this
feature available or is it still under development.

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