qmk-firmware/keyboards/clueboard/66/66.h

#ifndef CLUEBOARD_H
#define CLUEBOARD_H

#include "quantum.h"

#ifdef KEYBOARD_clueboard_66_rev1
    #include "rev1.h"
#endif
#ifdef KEYBOARD_clueboard_66_rev2
    #include "rev2.h"
#endif
#ifdef KEYBOARD_clueboard_66_rev3
    #include "rev3.h"
#endif

#endif