+/* HAS_IP_MREQ:
+ * This symbol, if defined, indicates the availability of
+ * struct ip_mreq;
+ */
+/* HAS_IP_MREQ_SOURCE:
+ * This symbol, if defined, indicates the availability of
+ * struct ip_mreq_source;
+ */
+/* HAS_IPV6_MREQ:
+ * This symbol, if defined, indicates the availability of
+ * struct ipv6_mreq;
+ */
+/* HAS_IPV6_MREQ_SOURCE:
+ * This symbol, if defined, indicates the availability of
+ * struct ipv6_mreq_source;
+ */