#ifndef _GETOPT_H#include <features.h>/* Get __GNU_LIBRARY__ defined now. */#include <posix/getopt.h># ifdef _GETOPT_Hlibc_hidden_proto(getopt_long)libc_hidden_proto(getopt_long_only)/* Now define the internal interfaces. */externvoid__getopt_clean_environment(char**__env);# endif#endif