View Compilation Error

195465_0_29986.c:16: error: syntax error before "isl"
195465_0_29986.c: In function `isl':
195465_0_29986.c:18: error: `true' undeclared (first use in this function)
195465_0_29986.c:18: error: (Each undeclared identifier is reported only once
195465_0_29986.c:18: error: for each function it appears in.)
195465_0_29986.c:18: error: `false' undeclared (first use in this function)