From e8ce697973ba7c7c8667c48ab6cd8509c77c37e1 Mon Sep 17 00:00:00 2001
From: Viktor Szakats <commit@vsz.me>
Date: Mon, 11 May 2026 10:50:36 +0200
Subject: [PATCH] idn: replace header guards with forward declaration

Follow-up to bc40e09f63889a8bc14fa8f7221921eb5b4a559e #21472

Closes #21551
---
 lib/idn.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/idn.h b/lib/idn.h
index b0ac981ba8..c73b870a70 100644
--- a/lib/idn.h
+++ b/lib/idn.h
@@ -25,19 +25,16 @@
  ***************************************************************************/
 
 struct Curl_str;
+struct hostname;
 
 bool Curl_is_ASCII_name(const char *hostname);
 bool Curl_is_ASCII_str(struct Curl_str *s);
 
-#ifdef HEADER_CURL_URLDATA_H /* HACK */
 CURLcode Curl_idnconvert_hostname(struct hostname *host);
-#endif
 
 #if defined(USE_LIBIDN2) || defined(USE_WIN32_IDN) || defined(USE_APPLE_IDN)
 #define USE_IDN
-#ifdef HEADER_CURL_URLDATA_H /* HACK */
 void Curl_free_idnconverted_hostname(struct hostname *host);
-#endif
 CURLcode Curl_idn_decode(const char *input, char **output);
 CURLcode Curl_idn_encode(const char *puny, char **output);
 #else