'for' loop initial declarations are only allowed in C99 or C11 mode

//#include <stdio.h>
long fib(long num);

int main(void){
       int seriesSize;

    scanf ("%d", &seriesSize);
    if (seriesSize <2)
        seriesSize =2;
    printf("First %d Fibonacci numbers: \n", seriesSize);
    for (int looper = 0; looper < seriesSize; looper++)
        {
        if(looper % 5)
            printf(", %81d", fib(looper));
        else
            printf("\n%81d", fib(looper));
        }
    printf("\n");
    return 0;
}
long fib(long num)
{
    if (num==0 || num==1)
        return num;
    return (fib (num-1) + fib (num-2));
}