Is there a possibility that it is conflicting with the Arduino macro?
#define min(a,b) ((a)<(b)?(a):(b))This is a rough way of writing it, but in the header
#include <M5EPD.h> #include <Settimino.h> #undef minWill it compile if I undef it?
However, in this case, the standard min cannot be used in this file.