View Compilation Error

0_0_2826986_2508.c:16: error: syntax error before "vis"
0_0_2826986_2508.c:17: error: syntax error before "mark"
0_0_2826986_2508.c: In function `main':
0_0_2826986_2508.c:63: error: `true' undeclared (first use in this function)
0_0_2826986_2508.c:63: error: (Each undeclared identifier is reported only once
0_0_2826986_2508.c:63: error: for each function it appears in.)