Compile errors with Arduino

[Yardie-]

Trying to compile throws

Arduino/libraries/epdiy/src/epd_driver/board/epd_board_v6.c:2:10: fatal error: board/epd_board_v6.h: No such file or directoryResolveLibrary(board/epd_board_v6.h)
  -> candidates: []
 #include "board/epd_board_v6.h"

I know the Arduino precompiler is bizarre and I have often had path issues like this.
It is something I never really solved.

[martinberlin]

As I commented in Slack I think the issue with Arduino IDE is that it expects all header includes without relative paths.
Gregory also please add exact steps to reproduce the error. Like:

• 1 Setup https://github.com/vroland/epdiy.git as a library ie symlink epdiy git to ~/Arduino/libraries
• 2 Create an Arduino basic sketch to start display, draw some text or shapes and clearscreen at the end

[mickeprag]

Ok, so I have been able to reproduce the issue. I get the same error.
I wonder what the best solution for this is? Is is possible to specify include directories for Arduino libraries?

[mickeprag]

Adding the include paths explicitly is unfortunately not yet supported:
arduino/arduino-cli#502