From a3c26e3df3d1fbdfbb4e3352aa0e43060f88e3a6 Mon Sep 17 00:00:00 2001
From: Jeremie Leska <jeremie.leska@6wind.com>
Date: Mon, 13 Apr 2026 14:21:45 +0200
Subject: [PATCH] build UPDATE avoid redefining HAVE_REGEX_H

Avoids conflicts during build with external libraries that already
define HAVE_REGEX_H.

Fixes: 0ba69b4377a8 ("build UPDATE optional regex dependency")
Signed-off-by: Jeremie Leska <jeremie.leska@6wind.com>
---
 src/ly_config.h.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/ly_config.h.in b/src/ly_config.h.in
index 5e27103c7..39b8296f1 100644
--- a/src/ly_config.h.in
+++ b/src/ly_config.h.in
@@ -85,7 +85,9 @@
 #endif
 
 /** existence of regex.h */
+#ifndef HAVE_REGEX_H
 #cmakedefine HAVE_REGEX_H
+#endif
 
 /** regex.h BSD flag */
 #cmakedefine HAVE_REG_STARTEND