I'm trying to move from the Arduino IDE to Visual Studio Code. I have a program that uses interrupt.h
but it's not being found because it's not on the include path. OK, just add it to the path. For the life of me I can't find where it is. I looked in the IDE installation under hardware\arduino\avr. No luck. I looked in a variety of places and eventually just searched my entire file system and the file doesn't appear to be there. But if I compile the code in the Arduino IDE, it compiles with no errors, no complaint about not finding avr\interrupt.h
Where is the header file?