Index: lib/sockopt.h
--- lib/sockopt.h.orig	2004-10-22 15:14:35 +0200
+++ lib/sockopt.h	2004-10-23 11:46:59 +0200
@@ -60,9 +60,15 @@
 
 #if defined (SUNOS_5)
 #define SOPT_SIZE_CMSG_RECVIF_IPV4()  (sizeof (uint_t))
-#else
+#elif defined (CMSG_ALIGN)
+#define SOPT_SIZE_CMSG_IFINDEX_IPV4()	\
+	CMSG_ALIGN((sizeof (struct sockaddr_dl)))
+#elif defined (__CMSG_ALIGN)
 #define SOPT_SIZE_CMSG_RECVIF_IPV4()	\
 	__CMSG_ALIGN((sizeof (struct sockaddr_dl)))
+#elif defined (_ALIGN)
+#define SOPT_SIZE_CMSG_IFINDEX_IPV4()	\
+	_ALIGN((sizeof (struct sockaddr_dl)))
 #endif /* SUNOS_5 */
 #endif /* IP_RECVIF */