How can one create RELENG_6 Jail on a -current system?

[Dmitry Morozovsky]

Dear colleagues,

I'm a bit puzzled - as contemporary current can't buildworld RELENG_6 system, 
how can I set up RELENG_6 jail?

Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:				     marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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