diff --git a/luasocket/src/usocket.h b/luasocket/src/usocket.h

index 45f2f99..ecbcd8e 100644

--- a/luasocket/src/usocket.h

+++ b/luasocket/src/usocket.h

@@ -31,6 +31,17 @@

 #include <netinet/tcp.h>

 #include <net/if.h>

+#ifndef SOCKET_SELECT

+#include <sys/poll.h>

+#define WAITFD_R        POLLIN

+#define WAITFD_W        POLLOUT

+#define WAITFD_C        (POLLIN|POLLOUT)

+#else

+#define WAITFD_R        1

+#define WAITFD_W        2

+#define WAITFD_C        (WAITFD_R|WAITFD_W)

+#endif

+

 #ifndef SO_REUSEPORT

 #define SO_REUSEPORT SO_REUSEADDR

 #endif