obj.ttl not available in vcl_deliver

[AD]

Hello,

 Per the docs it says that all the obj.* values should be available in
vcl_hit and vcl_deliver, but when trying to use obj.ttl in vcl_deliver i get
the following error:

Variable 'obj.ttl' not accessible in method 'vcl_deliver'.

This is on Ubuntu, Varnish 2.1.5.  Any ideas ?
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