|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
struct hostent *gethostbyname (const char *);
struct hostent *gethostbyaddr (const void *, socklen_t, int);
+#ifdef __GNUC__
+__attribute__((const))
+#endif
int *__h_errno_location(void);
#define h_errno (*__h_errno_location())
#define HOST_NOT_FOUND 1