> I ignored the hybrid character of the SqueakFFIPrims plugin. 
> After building it as an external plugin/library the tests in FFITester
> do work too.

As a matter of fact I have never even tried this with the FFI plugin as an
internal plugin. Mostly because it's very risky for purposes of shipping
plugins. Is the default in Ian's VMs to have the FFI builtin?

Cheers,
  - Andreas