Hi guys,
For a while now I have been trying to use FFI on the latest Etoys image, but something seemed to be broken on the Etoys image. I never took the time to look at it deeply until today. I think found the cause of this problem. It seems the Parser is not parsing external functions correctly. I fixed this by modifying the last line of Parser>>#externalFunctionDeclaration to add the pragma for the primitive 120 instead of simply returning 120 (I copied it from a squeak image). Now it seems to be working correctly and I think it doesn't have any undesirable side effect, although I'm not 100% sure. I published the change on etoysinbox. I don't know if somebody finds this useful but if you think it makes no harm, I'll be happy to move it to etoys.
Thanks! Richo