--- configure.ac.orig	2019-12-29 17:14:41.000000000 +0700
+++ configure.ac	2025-05-04 23:33:58.901840000 +0700
@@ -61,8 +68,8 @@
 dnl IDN
 dnl Default: enable it	
 LIBIDN=1
-AC_ARG_WITH(libidn,
- [  --with-libidn[=DIR]   Internationalized Domain Names support (needs GNU libidn)],dnl
+AC_ARG_WITH(libidn2,
+ [  --with-libidn2[=DIR]   Internationalized Domain Names support (needs GNU libidn2)],dnl
  [if test "$withval" != "no"; then
    if test "$withval" != "yes"; then
 	IDNROOT=$withval
@@ -186,7 +193,7 @@
        [AC_MSG_ERROR([echoping requires dlopen (dynamic loading of libraries) for plugins])])])
 
 if test "$LIBIDN" = "1"; then
-CF_LIB_LIBIDN
+CF_LIB_LIBIDN2
 fi
 if test "$OPENSSL" = "1" && test "$GNUTLS" = "1"; then
 AC_MSG_ERROR([Choose OpenSSL or GNU TLS but not both])