Hi Nicolas and Ludo, Ludovic Courtès writes: > Hi Nicolas, > > I have finally installed v3, thanks! I'm noticing that guile is now throwing a warning for the `(define-maybe match-criteria)` line. I don't know anything about the fancy configuration framework, but Brian tells me that a quick fix could be to change define-maybe to define-maybe/no-serialization. Nicolas, can you have a look? I'd be happy to push the fix. Best, -- Josselin Poiret