View Compilation Error

0_0_20290192_13615.c: In function 'main':
0_0_20290192_13615.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int soilders = 2; steps > 0; --steps, ++soilders) {
   ^
0_0_20290192_13615.c:11:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code