View Compilation Error

0_0_2479757_21372.c:6: error: syntax error before "used"
0_0_2479757_21372.c: In function `Dijstra':
0_0_2479757_21372.c:15: error: `true' undeclared (first use in this function)
0_0_2479757_21372.c:15: error: (Each undeclared identifier is reported only once
0_0_2479757_21372.c:15: error: for each function it appears in.)