In a fresh image, skip configuration and get a workspace, and evaluate 
the following:

     Metacello new configuration: 'FFI'; load

It will trundle along for a bit and then fail with:

This package depends on the following classes:
   BlockContext
You must resolve these dependencies before you will be able to load 
these definitions:
   BlockContext>>setAuthorInMetacelloConfig:
   BlockContext>>setBlessingInMetacelloConfig:
   BlockContext>>setDescriptionInMetacelloConfig:
   BlockContext>>setPackage:withInMetacelloConfig:
   BlockContext>>setProject:withInMetacelloConfig:
   BlockContext>>setTimestampInMetacelloConfig:
   BlockContext>>valueSupplyingMetacelloAnswers:

Cheers,
   Tony