From 767875b5a73f5630e75fe60a70473a17dda6a10f Mon Sep 17 00:00:00 2001
From: polluks2 <74630735+polluks2@users.noreply.github.com>
Date: Thu, 18 May 2023 00:08:26 +0200
Subject: [PATCH] Added guard

---
 include/geos/gconst.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/geos/gconst.h b/include/geos/gconst.h
index 55a99a21f..a1b6a1d86 100644
--- a/include/geos/gconst.h
+++ b/include/geos/gconst.h
@@ -9,7 +9,9 @@
 #ifndef _GCONST_H
 #define _GCONST_H
 
+#ifndef NULL
 #define NULL            ((void *) 0)
+#endif
 #define TRUE            0xff
 #define FALSE           ~TRUE
 #define MOUSE_SPRNUM    0