View Compilation Error

0_0_15845898_17699.c: In function 'main':
0_0_15845898_17699.c:21:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for (int l = 0; l <= n - k; l++)
     ^
0_0_15845898_17699.c:21:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_15845898_17699.c:24:6: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
      for (int ij = 0; ij < j; ij++)
      ^
0_0_15845898_17699.c:26:7: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
       for (int ijk = l; ijk < l + k; ijk++)
       ^