Oh my… You’d almost think that this was so important that you’d mention it in https://github.com/spark/firmware/blob/develop/docs/gettingstarted.md or any of the other “how to build locally” guides by Particle?
But Thanks a lot @peekay123! I now get a load of error messages (since the local build does not work with the Particle project structure) but those I should be able to handle 