src/reprap.c:53:28: fatal error: marlin/boards.h: No such file or directory

[probonopd]

Hi, great project, I'd like to compile the dev-mega2560 branch but I'm running into this issue:

src/reprap.c:53:28: fatal error: marlin/boards.h: No such file or directory
  #include "marlin/boards.h"
                            ^
compilation terminated.
make: *** [obj-x86_64-linux-gnu/reprap.o] Error 1
The command "make -I shared/libc3/" exited with 2.

https://travis-ci.com/probonopd/simreprap/builds/121396049#L841