delayed evaluation

Dear smlnj users,
I've been trying to use the delayed evaluation mechanisms of smlnj,
without success. I've been unable to find any documentation, so I've had
to rely on 
http://www.cs.cmu.edu/People/rwh/introsml/core/lazydata.htm
however, the line 
Compiler.Control.Lazy.enabled := true;

flags the error
stdIn:1.1-1.30 Error: unbound structure: Control in path
Compiler.Control.Lazy.enabled

open Compiler displays this:
opening Compiler
  val architecture : string
  val version : {date:string, system:string, version_id:int list}

I'm using Standard ML of New Jersey v110.52 [built: Fri Jan 21 16:42:10
2005]
on debian unstable

thanks for any future help!
--Jacques



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