diff -Naur traceroute-2.1.2.orig/traceroute/traceroute.c traceroute-2.1.2/traceroute/traceroute.c
--- traceroute-2.1.2.orig/traceroute/traceroute.c	2023-02-13 18:37:06.000000000 +0100
+++ traceroute-2.1.2/traceroute/traceroute.c	2023-08-29 17:36:52.703911135 +0200
@@ -31,6 +31,9 @@
 #include "version.h"
 #include "traceroute.h"
 
+#ifndef IPV6_TCLASS
+#define IPV6_TCLASS 67
+#endif
 
 #ifndef ICMP6_DST_UNREACH_BEYONDSCOPE
 #ifdef ICMP6_DST_UNREACH_NOTNEIGHBOR
@@ -201,7 +204,7 @@
 
 	memset (&hints, 0, sizeof (hints));
 	hints.ai_family = af;
-	hints.ai_flags = AI_IDN;
+	/* hints.ai_flags = AI_IDN; */
 
 	ret = getaddrinfo (name, NULL, &hints, &res);
 	if (ret) {
@@ -741,7 +744,7 @@
 
 	    buf[0] = '\0';
 	    getnameinfo (&res->sa, sizeof (*res), buf, sizeof (buf),
-							    0, 0, NI_IDN);
+							    0, 0, 0);
 	    printf (" %s (%s)", buf[0] ? buf : str, str);
 	}