From 5eedcc465157265ad1783337722ee1f9d8f25f17 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 25 Feb 2017 13:52:45 +0100
Subject: [PATCH] make cmake configure version with older versions

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5bd4c35ed..a0d8f5eb4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,9 @@ cmake_minimum_required(VERSION 2.8.0 FATAL_ERROR)
 
 if(COMMAND cmake_policy)
     cmake_policy(SET CMP0003 NEW)
-    cmake_policy(SET CMP0020 NEW)
+    if(POLICY CMP0020)
+        cmake_policy(SET CMP0020 NEW)
+    endif(POLICY CMP0020)
     # added in cmake 3.0
     if(POLICY CMP0050)
         cmake_policy(SET CMP0050 OLD)