Followed the instructions under macOS with both Versions of the Arduino IDE 1.18.19 nor 2.0.4. Installed the files into the current dir ~/Library/Arduino15/packages/arduino/hardware/RaspberryPi/piduino . Also installed the toolchain from https://github.com/me-no-dev/RasPiArduino/releases/download/0.0.1/arm-linux-gnueabihf-osx.tar.gz to ~/Library/Arduino15/packages/arduino/hardware/RaspberryPi/piduino/tools/arm-linux-gnueabihf . However, the board "RaspberryPI" does not show up in the list of boards and not in the board manager. Did someone manage to run RasPiArduino recently? With recent macOS, raspbian and e.g. a Pi Zero?