--- lwip-2.0.2/src/include/lwip/priv/memp_std.h   (original)
+++ lwip-2.0.2/src/include/lwip/priv/memp_std.h   (patched)
@@ -63,6 +63,10 @@
 LWIP_MEMPOOL(NETBUF,         MEMP_NUM_NETBUF,          sizeof(struct netbuf),         "NETBUF")
 LWIP_MEMPOOL(NETCONN,        MEMP_NUM_NETCONN,         sizeof(struct netconn),        "NETCONN")
 #endif /* LWIP_NETCONN || LWIP_SOCKET */
+
+#if LWIP_SOCKET
+LWIP_MEMPOOL(SELECT_CB,      MEMP_NUM_SELECT_CB,       sizeof(struct lwip_select_cb), "SELECT_CB")
+#endif /* LWIP_SOCKET */
 
 #if NO_SYS==0
 LWIP_MEMPOOL(TCPIP_MSG_API,  MEMP_NUM_TCPIP_MSG_API,   sizeof(struct tcpip_msg),      "TCPIP_MSG_API")