View Compilation Error

0_0_6593630_20562.c:6: error: syntax error before "pic"
0_0_6593630_20562.c: In function `readin':
0_0_6593630_20562.c:16: error: `true' undeclared (first use in this function)
0_0_6593630_20562.c:16: error: (Each undeclared identifier is reported only once
0_0_6593630_20562.c:16: error: for each function it appears in.)
0_0_6593630_20562.c: In function `dfs':
0_0_6593630_20562.c:29: error: `true' undeclared (first use in this function)
0_0_6593630_20562.c: In function `solve':
0_0_6593630_20562.c:55: error: `false' undeclared (first use in this function)