--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
-PROJECT(violetland)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.0...4.0 FATAL_ERROR) 
 
-CMAKE_MINIMUM_REQUIRED(VERSION 2.6.0 FATAL_ERROR) 
+PROJECT(violetland)
 
 find_package(SDL REQUIRED)
 find_package(SDL_image REQUIRED)
--- a/lib/fcitx/CMakeLists.txt
+++ b/lib/fcitx/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 2.6...4.0)
 
 project(fcitx)
 
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -1,5 +1,5 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.0...4.0 FATAL_ERROR) 
 PROJECT(po)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.6.0 FATAL_ERROR) 
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../lib/CMake-Gettext")
 set(GettextTranslate_ALL true)