From 6e0af8abe4ae939eab629d848c232ebc9cdedcd0 Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Thu, 25 Mar 2021 15:37:52 +0100
Subject: [PATCH] physics: Fix Mac OS X 10.6 compilation issue with <atomic>
 header

---
 panda/src/physics/physicalNode.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/panda/src/physics/physicalNode.cxx b/panda/src/physics/physicalNode.cxx
index 18858b6201..87b8216eb1 100644
--- a/panda/src/physics/physicalNode.cxx
+++ b/panda/src/physics/physicalNode.cxx
@@ -14,7 +14,9 @@
 #include "physicalNode.h"
 #include "physicsManager.h"
 
+#ifdef PHAVE_ATOMIC
 #include <atomic>
+#endif
 
 // static stuff.
 static std::atomic_flag warned_copy_physical_node = ATOMIC_FLAG_INIT;