cmake: require at least 3.1 for target_sources()

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6b6ae2ca531c06da4d9d4c066b5255bd3898d21d..a62f12bd259a14a7cce8c07f4400250899995aab 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,7 +18,7 @@
 #       cmake -G "Visual Studio 10" ..
 #       start libevent.sln
 #
-cmake_minimum_required(VERSION 2.8.0 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
 
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Release