From 5d23fa71ff27c1ede67fd632f57068aa494dbc11 Mon Sep 17 00:00:00 2001
From: Richard Harrison <rjh@zaretto.com>
Date: Sun, 2 Apr 2017 02:09:38 +0200
Subject: [PATCH] OSG 3.5.x compatibility fix

OSG 3.5 (and maybe before) declares that ThreadSafeRefenceCounting is no longer required and it has been removed.
---
 src/Main/options.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index d1e2fd45d..c0be70768 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -239,8 +239,10 @@ void fgSetDefaults ()
     v->setValueReadOnly("simgear", SG_STRINGIZE(SIMGEAR_VERSION));
 #ifndef FG_TESTLIB
     v->setValueReadOnly("openscenegraph", osgGetVersion());
+#if OSG_VERSION_LESS_THAN(3,5,2)
     v->setValueReadOnly("openscenegraph-thread-safe-reference-counting",
                          osg::Referenced::getThreadSafeReferenceCounting());
+#endif
 #endif
     v->setValueReadOnly("revision", REVISION);
     v->setValueReadOnly("build-number", HUDSON_BUILD_NUMBER);