View Compilation Error

487218_0_0_25095.c: In function `Dijkstra':
487218_0_0_25095.c:9: error: `bool' undeclared (first use in this function)
487218_0_0_25095.c:9: error: (Each undeclared identifier is reported only once
487218_0_0_25095.c:9: error: for each function it appears in.)
487218_0_0_25095.c:9: error: syntax error before "s"
487218_0_0_25095.c:13: error: `s' undeclared (first use in this function)
487218_0_0_25095.c:13: error: `false' undeclared (first use in this function)
487218_0_0_25095.c:16: error: `true' undeclared (first use in this function)