Hi Daniel,
I guess we can be 100% sure of ALL platforms but it is a macro on all the ones I tested:

SmartOS and Solaris 11:

#if !defined(_XPG4_2) || defined(__EXTENSIONS__)
#define ntohll(x)       (x)
#define htonll(x)       (x)
#endif  /* !_XPG4_2 || __EXTENSIONS__ */

OSX:

#if     defined(KERNEL) || (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))

#define ntohll(x)       ((__uint64_t)(x))
#define htonll(x)       ((__uint64_t)(x))

#define NTOHL(x)        (x)
#define NTOHS(x)        (x)
#define NTOHLL(x)       (x)
#define HTONL(x)        (x)
#define HTONS(x)        (x)
#define HTONLL(x)       (x)
#endif /* defined(KERNEL) || (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) */

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