GitHub Workflow - can not find arduino.h

I just started with GitHub Workflows and used the PlatformIO recommendation to create a workflow.
It starts to compile the framework, but fails, when it comes to my own code by not finding arduino.h.

Does anybody have a hint on what I am missing? Below is my platformio.ini

platform = nordicnrf52
board = adafruit_itsybitsy_nrf52840
framework = arduino
extra_scripts = 
;	pre:scripts/
;custom_build_files_exclude = **driver**\Spi*.cpp
lib_deps = 
	adafruit/Adafruit DotStar@^1.2.5

As far as I know, the GitHub workflows run on a Linux system.
There, the file names are case-sensitive!
A correct #inlcude <Arduino.h> in your code should fix the problem.

1 Like

You made my day! Thank you!
And how embarrassing using C++ for decades but nearly always on Windows…
That was the solution.