From 13d88c7fec93e1601bfb52b5c87889ae18e035ab Mon Sep 17 00:00:00 2001
From: Philippe Renon <philippe_renon@yahoo.fr>
Date: Thu, 25 Jan 2018 16:49:05 +0100
Subject: [PATCH] os_utils: fix non portable use of "defined"

see https://github.com/openscenegraph/OpenSceneGraph/issues/458
---
 src/osg/os_utils.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/osg/os_utils.cpp b/src/osg/os_utils.cpp
index 7689c122f..1bb70c2fc 100644
--- a/src/osg/os_utils.cpp
+++ b/src/osg/os_utils.cpp
@@ -15,10 +15,11 @@
 
 extern "C" {
 
-#define USE_POSIX_SPAWN defined(__APPLE__)
-//#define USE_POSIX_SPAWN true
+#ifdef __APPLE__
+#define USE_POSIX_SPAWN 1
+#endif
 
-#if USE_POSIX_SPAWN
+#ifdef USE_POSIX_SPAWN
 
 #include <spawn.h>
 #include <sys/wait.h>