From e4b58b65f3b8be42efe816eeababf9e97a5e5b69 Mon Sep 17 00:00:00 2001
From: Scott Giese <scttgs0@gmail.com>
Date: Sat, 2 Feb 2019 19:46:04 -0600
Subject: [PATCH] Remove deprecated boost/utility. This is enable compatibility
 with boost 1.69.

---
 simgear/nasal/cppbind/NasalHash.hxx    | 1 +
 simgear/props/props.hxx                | 3 ++-
 simgear/structure/SGWeakReferenced.hxx | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/simgear/nasal/cppbind/NasalHash.hxx b/simgear/nasal/cppbind/NasalHash.hxx
index aac672fd..5019d08b 100644
--- a/simgear/nasal/cppbind/NasalHash.hxx
+++ b/simgear/nasal/cppbind/NasalHash.hxx
@@ -24,6 +24,7 @@
 
 #include <simgear/structure/map.hxx>
 #include <boost/iterator/iterator_facade.hpp>
+#include <boost/core/enable_if.hpp>
 
 namespace nasal
 {
diff --git a/simgear/props/props.hxx b/simgear/props/props.hxx
index c94186cb..68d3c03c 100644
--- a/simgear/props/props.hxx
+++ b/simgear/props/props.hxx
@@ -55,13 +55,14 @@ namespace boost {
   struct disable_if : public disable_if_c<Cond::value, T> {};
 }
 #else
-# include <boost/utility.hpp>
 # include <boost/type_traits/is_enum.hpp>
+# include <boost/core/enable_if.hpp>
 
 # include <simgear/debug/logstream.hxx>
 # include <simgear/math/SGMathFwd.hxx>
 # include <simgear/math/sg_types.hxx>
 #endif
+
 #include <simgear/structure/SGReferenced.hxx>
 #include <simgear/structure/SGSharedPtr.hxx>
 
diff --git a/simgear/structure/SGWeakReferenced.hxx b/simgear/structure/SGWeakReferenced.hxx
index 3bb70ffa..27f647b4 100644
--- a/simgear/structure/SGWeakReferenced.hxx
+++ b/simgear/structure/SGWeakReferenced.hxx
@@ -22,7 +22,7 @@
 #include "SGSharedPtr.hxx"
 
 #include <boost/type_traits/is_base_of.hpp>
-#include <boost/utility/enable_if.hpp>
+#include <boost/core/enable_if.hpp>
 
 #ifdef _MSC_VER
 # pragma warning(push)