text: #define _GNU_SOURCE
  
  #include <sys/socket.h>
  #include <netdb.h>
  
  int gethostbyname_r(const char *name,
  	struct hostent *h, char *buf, size_t buflen,
  	struct hostent **res, int *err)
  {
  	return gethostbyname2_r(name, AF_INET, h, buf, buflen, res, err);
  }
  