prevent NS_IN6ADDRSZ from getting set to zero if the struct doesn't exist

#endif

#ifndef NS_IN6ADDRSZ

#if SIZEOF_STRUCT_IN6_ADDR == 0

/* We cannot have it set to zero, so we pick a fixed value here */

#define NS_IN6ADDRSZ 16

#else

#define NS_IN6ADDRSZ SIZEOF_STRUCT_IN6_ADDR

#endif

#endif

#ifndef NS_INADDRSZ

#define NS_INADDRSZ SIZEOF_STRUCT_IN_ADDR