View Compilation Error

584450_0_0_15012.c: In function `main':
584450_0_0_15012.c:6: error: `_int64' undeclared (first use in this function)
584450_0_0_15012.c:6: error: (Each undeclared identifier is reported only once
584450_0_0_15012.c:6: error: for each function it appears in.)
584450_0_0_15012.c:6: error: syntax error before "f1"
584450_0_0_15012.c:8: error: `f1' undeclared (first use in this function)
584450_0_0_15012.c:8: error: `f2' undeclared (first use in this function)
584450_0_0_15012.c:10: error: `f3' undeclared (first use in this function)