View Compilation Error

0_0_10550337_8697.c: In function `main':
0_0_10550337_8697.c:4: error: `__int64_t' undeclared (first use in this function)
0_0_10550337_8697.c:4: error: (Each undeclared identifier is reported only once
0_0_10550337_8697.c:4: error: for each function it appears in.)
0_0_10550337_8697.c:4: error: syntax error before "j"
0_0_10550337_8697.c:8: error: `j' undeclared (first use in this function)
0_0_10550337_8697.c:8: error: `k' undeclared (first use in this function)
0_0_10550337_8697.c:9: error: `l' undeclared (first use in this function)