How can I make configurations from

MetaRepoPharo30 work on Pharo4?

I have switched the Repository from

MetaRepoPhar40 to MetaRepoPharo30 and
tried to load NaCl (Install stable version).
It fails with 'Name not found: FFI'

And ConfigurationOfFFI doesn't load either.

btw, If I loaded a ConfigurationOfXXX how do I know
what versions are loadable? Should all ConfigurationOf projects
have the same symbolic versions (development/stable/ ...)

regards
Nicolai