View Compilation Error

738545_0_0_11261.c: In function `main':
738545_0_0_11261.c:8: error: `bool' undeclared (first use in this function)
738545_0_0_11261.c:8: error: (Each undeclared identifier is reported only once
738545_0_0_11261.c:8: error: for each function it appears in.)
738545_0_0_11261.c:8: error: syntax error before "flag"
738545_0_0_11261.c:21: error: `flag' undeclared (first use in this function)
738545_0_0_11261.c:21: error: `false' undeclared (first use in this function)