Add a "fork" of musl as //fusl.

fusl/include/netinet/igmp.h

+#ifndef _NETINET_IGMP_H
+#define _NETINET_IGMP_H
+
+#include <stdint.h>
+#include <netinet/in.h>
+
+struct igmp {
+        uint8_t igmp_type;
+        uint8_t igmp_code;
+        uint16_t igmp_cksum;
+        struct in_addr igmp_group;
+};
+
+#define IGMP_MINLEN                     8
+
+#define IGMP_MEMBERSHIP_QUERY           0x11
+#define IGMP_V1_MEMBERSHIP_REPORT       0x12
+#define IGMP_V2_MEMBERSHIP_REPORT       0x16
+#define IGMP_V2_LEAVE_GROUP             0x17
+
+#define IGMP_DVMRP                      0x13
+#define IGMP_PIM                        0x14
+#define IGMP_TRACE                      0x15
+
+#define IGMP_MTRACE_RESP                0x1e
+#define IGMP_MTRACE                     0x1f
+
+#define IGMP_MAX_HOST_REPORT_DELAY      10
+#define IGMP_TIMER_SCALE                10
+
+#define IGMP_DELAYING_MEMBER    1
+#define IGMP_IDLE_MEMBER        2
+#define IGMP_LAZY_MEMBER        3
+#define IGMP_SLEEPING_MEMBER    4
+#define IGMP_AWAKENING_MEMBER   5
+
+#define IGMP_v1_ROUTER          1
+#define IGMP_v2_ROUTER          2
+
+#define IGMP_HOST_MEMBERSHIP_QUERY      IGMP_MEMBERSHIP_QUERY
+#define IGMP_HOST_MEMBERSHIP_REPORT     IGMP_V1_MEMBERSHIP_REPORT
+#define IGMP_HOST_NEW_MEMBERSHIP_REPORT IGMP_V2_MEMBERSHIP_REPORT
+#define IGMP_HOST_LEAVE_MESSAGE         IGMP_V2_LEAVE_GROUP
+
+#endif