From 7a2860bf703fc5648eac9e3695b813ecd23b39d8 Mon Sep 17 00:00:00 2001
From: Russel Waters <russel@nano.org>
Date: Wed, 12 Feb 2020 09:42:51 -0500
Subject: [PATCH] guard policy setting by version checks (#2550)

* guard policy setting by version checks greater or equal
short explainations of policies being set
---
 CMakeLists.txt | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48a1d5e3..ce27035e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,13 @@
 cmake_minimum_required (VERSION 3.4)
 
-cmake_policy(SET CMP0074 NEW)
-cmake_policy(SET CMP0077 NEW)
+if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12")
+	#find_package uses <PACKAGENAME>_ROOT variables
+	cmake_policy(SET CMP0074 NEW)
+endif()
+if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.13")
+	#option honors normal variables
+	cmake_policy(SET CMP0077 NEW)
+endif()
 # compatibility for osx sierra and on
 # needs to be set before project
 set (CMAKE_OSX_DEPLOYMENT_TARGET 10.12 CACHE STRING "")