void *obj_malloc (int size) = #0;
void printf (string fmt, ...) = #0;
int errno (void) = #0;
string strerror (int err) = #0;
void exit (int code) = #0;
void traceon (void) = #0;
void traceoff (void) = #0;
entity spawn (void) = #0;
void remove (entity e) = #0;
id obj_msgSend (id receiver, SEL op, ...) = #0;
void __obj_exec_class (struct obj_module *msg) = #0;