/home/user/Downloads/robson-main/robson.c: In function ‘handler_pre’:
/home/user/Downloads/robson-main/robson.c:33:2: error: ‘for’ loop initial declarations are only allowed in C99 mode
  for (int i = 0; i < 2; i++) {
  ^
/home/user/Downloads/robson-main/robson.c: