From 4ff30d57c654f34d04eb1cc5b2b76e4d52c78b35 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sun, 12 Jun 2022 22:56:26 +0200
Subject: [PATCH] cpl_spawn.cpp: fix linking with FreeBSD (found with CheriBSD)

---
 port/cpl_spawn.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/port/cpl_spawn.cpp b/port/cpl_spawn.cpp
index fa93d12358d5..a5f8425e70cc 100644
--- a/port/cpl_spawn.cpp
+++ b/port/cpl_spawn.cpp
@@ -57,7 +57,11 @@
         #include <crt_externs.h>
         #define environ (*_NSGetEnviron())
     #else
-        extern char** environ;
+        #if defined(__FreeBSD__)
+            extern __attribute__((__weak__)) char **environ;
+        #else
+            extern char** environ;
+        #endif
     #endif
 #endif
 #endif