/usr/x86_64-w64-mingw32/include/in6addr.h is in mingw-w64-x86-64-dev 2.0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27  | /**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
 */
#ifndef s6_addr
#include <_bsd_types.h>
typedef struct in6_addr {
  union {
    u_char Byte[16];
    u_short Word[8];
  } u;
} IN6_ADDR, *PIN6_ADDR, *LPIN6_ADDR;
#define in_addr6	in6_addr
#define _S6_un		u
#define _S6_u8		Byte
#define s6_addr		_S6_un._S6_u8
#define s6_bytes	u.Byte
#define s6_words	u.Word
#endif /* s6_addr */
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