diff -ruN --no-dereference mlibc-3.0.0-rc1/abis/linux/in.h mlibc/abis/linux/in.h
--- mlibc-3.0.0-rc1/abis/linux/in.h	2022-08-01 15:24:41.000000000 -0300
+++ mlibc/abis/linux/in.h	2022-10-24 16:40:48.153224040 -0300
@@ -67,6 +67,9 @@
 
 #define IPPORT_RESERVED 1024
 
+#define IP_MULTICAST_TTL 33
+#define IPV6_MULTICAST_HOPS 18
+
 #define IPPROTO_IP       0
 #define IPPROTO_HOPOPTS  0
 #define IPPROTO_ICMP     1