View Compilation Error

0_0_30664079_13171.c: In function 'main':
0_0_30664079_13171.c:9:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
  for (int i=0;i<T;i++)
  ^
0_0_30664079_13171.c:9:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_30664079_13171.c: In function 'gl':
0_0_30664079_13171.c:20:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i=0;i<m-1;i++)
   ^