View Compilation Error

0_0_32104881_12687.c: In function 'map':
0_0_32104881_12687.c:9:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i = 1;i <= 10000000;i++)
  ^
0_0_32104881_12687.c:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code