From: lightningkay <ew_34@sina.com>
Date: Thu, 2 Nov 2017 06:58:17 +0000 (+0800)
Subject: cmake doesn't has POLICY CMP0054 in low version
X-Git-Tag: release-2.1.9-beta^2~151
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4a2373eec0f8e263737f07ae569970e14019597b;p=libevent

cmake doesn't has POLICY CMP0054 in low version

(cherry picked from commit 3f19c5eb8335500ca6f0dd3b62c32d06103757d0)
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d5273a87..3e1b0f71 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,7 +23,10 @@ if (APPLE)
 else()
     cmake_minimum_required(VERSION 2.8.3 FATAL_ERROR)
 endif()
-cmake_policy(SET CMP0054 NEW)
+
+if (POLICY CMP0054)
+    cmake_policy(SET CMP0054 NEW)
+endif()
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release