View Compilation Error

0_0_23660254_21277.c: In function 'max_argmax':
0_0_23660254_21277.c:68:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i=start;i<len;i+=t)
     ^
0_0_23660254_21277.c:68:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code