Merge pull request #491 from redboltz/fix_424

Fix 424

Author: redboltz

CMakeLists.txt

@@ -1,4 +1,10 @@
 CMAKE_MINIMUM_REQUIRED (VERSION 2.8.6)
+
+IF ((CMAKE_VERSION VERSION_GREATER 3.1) OR
+    (CMAKE_VERSION VERSION_EQUAL 3.1))
+    CMAKE_POLICY(SET CMP0054 NEW)
+ENDIF ()
+
 PROJECT (msgpack)
 
 FILE (READ ${CMAKE_CURRENT_SOURCE_DIR}/include/msgpack/version_master.h contents)