ref: 41f85d46f866c57a618b8df85c0e59cebc04f095 dir: /sys/src/ape/lib/bsd/in6_addr.c/
#include <netinet/in.h> struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;