diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a410783..92153f47 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,7 @@
 # For this purpose you can define a CMake var: OPENJPEG_NAMESPACE to whatever you like
 # e.g.:
 # set(OPENJPEG_NAMESPACE "GDCMOPENJPEG")
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 2.8.5)
 
 if(COMMAND CMAKE_POLICY)
   cmake_policy(SET CMP0003 NEW)
@@ -104,6 +104,8 @@ endif()
 
 # --------------------------------------------------------------------------
 # Install directories
+include(GNUInstallDirs)
+
 # Build DOCUMENTATION (not in ALL target and only if Doxygen is found)
 option(BUILD_DOC "Build the HTML documentation (with doxygen if available)." OFF)