-#if !defined(INET6)
-#error "this file should only be included when INET6 is defined"
-#endif /* not defined(INET6) */
-
-#if defined(SOL2)
-#include <netinet/in.h>
-
-typedef union {
- uint8_t e8[8]; /* lower 64-bit IPv6 address */
- uint32_t e32[2]; /* lower 64-bit IPv6 address */
-} eui64_t;
-
-/*
- * Declare the two below, since in.h only defines them when _KERNEL
- * is declared - which shouldn't be true when dealing with user-land programs
- */
-#define s6_addr8 _S6_un._S6_u8
-#define s6_addr32 _S6_un._S6_u32
-
-#else /* else if not defined(SOL2) */
-
-/*
- * TODO:
- *
- * Maybe this should be done by processing struct in6_addr directly...
- */
-typedef union
-{
- u_int8_t e8[8];
- u_int16_t e16[4];
- u_int32_t e32[2];
-} eui64_t;
-
-#endif /* defined(SOL2) */
+#if !defined(PPP_WITH_IPV6CP)
+#error "this file should only be included when PPP_WITH_IPV6CP is defined"
+#endif /* not defined(PPP_WITH_IPV6CP) */