View Compilation Error

0_0_2822290_5829.c:8: error: syntax error before "isok"
0_0_2822290_5829.c: In function `isok':
0_0_2822290_5829.c:11: error: `true' undeclared (first use in this function)
0_0_2822290_5829.c:11: error: (Each undeclared identifier is reported only once
0_0_2822290_5829.c:11: error: for each function it appears in.)
0_0_2822290_5829.c:13: error: `false' undeclared (first use in this function)