View Compilation Error

150524_0_875.c: In function `main':
150524_0_875.c:5: error: `_int64' undeclared (first use in this function)
150524_0_875.c:5: error: (Each undeclared identifier is reported only once
150524_0_875.c:5: error: for each function it appears in.)
150524_0_875.c:5: error: syntax error before "m"
150524_0_875.c:11: error: `m' undeclared (first use in this function)
150524_0_875.c:11: error: `k' undeclared (first use in this function)