qmk-firmware/keyboards/cannonkeys/db60/db60.h

 /* Copyright 2021 Andrew Kannan
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

#if defined(KEYBOARD_cannonkeys_db60_j02)
    #include "j02.h"
#elif defined(KEYBOARD_cannonkeys_db60_hotswap)
    #include "hotswap.h"
#else
    #include "rev2.h"
#endif