$ LC_ALL=C make
cc -Wall -g -O3 -DF_CPU=16000000 -include config.h -I. -DPLAT_LINUX -c grbl_interface.c -o grbl_interface.o
In file included from <command-line>:
./config.h:28:10: fatal error: ../system.h: No such file or directory
#include "../system.h"
^~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:64: grbl_interface.o] Error 1