Compile Error: ‘struct in6_addr’ has no member named ‘__in6_u’;

[Rot127]

Building fails with:

helpers.c:57:34: error: ‘struct in6_addr’ has no member named ‘__in6_u’; did you mean ‘__in6_union’?
   57 |                         &this_ip.__in6_u.__u6_addr8[3],
      |                                  ^~~~~~~
      |                                  __in6_union

Can be fixed by changing &this_ip.__in6_u.__u6_addr8[0] with &this_ip.s6_addr[0].
For references: in6_addr is declared in /usr/include/linux/in6.h