GCC support.

include/functions.h

@@ -4,7 +4,14 @@
 #include "z64.h"
 
 f32 fabsf(f32 f);
+#ifndef __sgi
+#define fabsf __builtin_fabsf
+f32 __floatundisf(u32 c);
+f64 __floatundidf(u32 c); 
+unsigned long __udivdi3(unsigned long a, unsigned long b);
+#else
 #pragma intrinsic(fabsf)
+#endif
 f32 sqrtf(f32 f);
 #pragma intrinsic(sqrtf)
 f64 sqrt(f64 d);