View Compilation Error

0_0_36009254_25419.c: In function 'get_prime':
0_0_36009254_25419.c:67:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for (int j = i + i; j < maxn; j += i)
             ^
0_0_36009254_25419.c:67:13: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code