From c1be5a32e8e9d130592355c97ebc89ddc5e81d7d Mon Sep 17 00:00:00 2001
From: Jianghua Yang <yjhjstz@gmail.com>
Date: Thu, 19 Mar 2026 10:59:11 -0700
Subject: [PATCH] Fix build failure on macOS 26.2 SDK due to missing
 nl_langinfo_l declaration

macOS 26.2 SDK changed langinfo.h to only expose nl_langinfo_l() when
_USE_EXTENDED_LOCALES_ is defined, via xlocale/_langinfo.h.  Previous
SDK versions exposed it unconditionally.  This caused a build error in
chklocale.c:

  error: call to undeclared function 'nl_langinfo_l'

Fix by explicitly including <xlocale.h> on Apple platforms, which
declares nl_langinfo_l() regardless of _USE_EXTENDED_LOCALES_.
---
 src/port/chklocale.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/port/chklocale.c b/src/port/chklocale.c
index 664eeab9050..4428b99d79e 100644
--- a/src/port/chklocale.c
+++ b/src/port/chklocale.c
@@ -21,6 +21,9 @@
 
 #ifndef WIN32
 #include <langinfo.h>
+#ifdef __APPLE__
+#include <xlocale.h>				/* provides nl_langinfo_l on macOS */
+#endif
 #endif
 
 #include "mb/pg_wchar.h"
-- 
2.50.1 (Apple Git-155)