diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02713ff9..d4567da2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.4)
 
 PROJECT (SEMS)