-#ifndef HAVE_GAI_STRERROR
-const char *gai_strerror(int errcode);
-#endif
-
-#ifndef EINPROGRESS
-# ifdef WSAEINPROGRESS
-# define EINPROGRESS WSAEINPROGRESS
-# define EHOSTUNREACH WSAEHOSTUNREACH
-# define ECONNREFUSED WSAECONNREFUSED
-# define ECONNRESET WSAECONNRESET
-# define ETIMEDOUT WSAETIMEDOUT
-# endif