> Does running make rktio in the cs directory help? I needed to run make rktio-rktl and make in the cs directory.

> I suppose deleting all compiled files should work though. That would have been my “if everything else fails” fallback. :wink:

Ah, yes, I think make in the cs directory does not track rktio dependencies so a separate make rktio in cs is needed (I didn’t know the name has changed to make rktio-rktl though.)

Last time I did this: https://github.com/racket/racket/blob/master/racket/src/cs/README.txt#L277-L284

The make rktio stuff recompiles the rktio files into Scheme code, and make in cs incorporate that into Racket

> I didn’t know the name has changed to make rktio-rktl though. Could be both, maybe in a different directory. It’s all quite confusing IMHO.