: dev3; cat longnow.c 
    #include <stdio.h>

    int
    main()
    {
      long then = 0;
      long long now = 0;
      long long long time = 0;
      printf("then was %ld, now is %lld, time is %llld\n", then, now, time);
      return 0;
    }
    : dev3; gcc longnow.c
    longnow.c: In function ‘main’:
    longnow.c:8:13: error: ‘long long long’ is too long for GCC
        8 |   long long long time = 0;
          |             ^~~~