#ifdef HAVE_GETOPT_H
# include <getopt.h>
#endif
-#ifdef _WIN32
-# include <winsock2.h>
-# define SOCKET_AVAIL
-#elif defined HAVE_SYS_SOCKET_H
-# include <sys/socket.h>
+#ifdef SOCKET_AVAIL
+# include HEADER_SOCKET
#endif
#include <ctype.h>
#include <errno.h>