View Compilation Error

0_0_27292027_5509.c: In function 'main':
0_0_27292027_5509.c:7:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for( unsigned t=0; t!=T; ++t )
     ^
0_0_27292027_5509.c:7:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_27292027_5509.c:17:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for( unsigned i=0; i!=N; ++i )
         ^