From 95ad34c5d70f3def18a8286f2cdde85371031988 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brechtvanlommel@gmail.com>
Date: Mon, 3 Feb 2020 18:44:52 +0100
Subject: [PATCH] Fix CMake error with versions older than 3.9

---
 CMakeLists.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbb528607c8..2bac16c339a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -98,7 +98,9 @@ cmake_policy(SET CMP0010 NEW)
 cmake_policy(SET CMP0014 NEW)
 
 # Silence draco warning on macOS, new policy works fine.
-cmake_policy(SET CMP0068 NEW)
+if(POLICY CMP0068)
+  cmake_policy(SET CMP0068 NEW)
+endif()
 
 #-----------------------------------------------------------------------------
 # Load some macros.