diff --git a/zebra/rt_socket.c b/zebra/rt_socket.c
index bf21ca9..a7ef457 100644
--- a/zebra/rt_socket.c
+++ b/zebra/rt_socket.c
@@ -41,6 +41,7 @@
                       union sockunion *mask, union sockunion *gate,
                       unsigned int index, int zebra_flags, int metric);
 
+#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 /* Adjust netmask socket length. Return value is a adjusted sin_len
    value. */
 static int
@@ -63,6 +64,7 @@
     len--;
   return len;
 }
+#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
 
 /* Interface between zebra message and rtm message. */
 static int
@@ -244,6 +246,7 @@
 
 #ifdef HAVE_IPV6
 
+#ifdef SIN6_LEN
 /* Calculate sin6_len value for netmask socket value. */
 static int
 sin6_masklen (struct in6_addr mask)
@@ -266,6 +269,7 @@
 
   return len;
 }
+#endif /* SIN6_LEN */
 
 /* Interface between zebra message and rtm message. */
 static int
@@ -368,6 +372,8 @@
 	  zlog_info ("kernel_rtm_ipv6_multipath(): nexthop %d add error=%d.",
 	    nexthop_num, error);
 	}
+#else
+      (void)error;
 #endif
 
       nexthop_num++;