#include <stdio.h>#include"dietwarning.h"#undef setlinebuf/* there is no previous prototype because it is a #define */voidsetlinebuf(FILE* stream);voidsetlinebuf(FILE* stream) {setvbuf(stream,0,_IOLBF,BUFSIZ);}link_warning("setlinebuf","warning: you used setlinebuf without including <stdio.h>")