--- CMakeLists.txt.orig	2016-02-09 19:18:58 UTC
+++ CMakeLists.txt
@@ -14,7 +14,7 @@
 # and provide build configuration options.
 ######################################################################
 
-cmake_minimum_required(VERSION 2.6.2)
+cmake_minimum_required(VERSION 3.5)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS TRUE)
 cmake_policy(SET CMP0003 NEW)
 
@@ -100,9 +100,9 @@ if (CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLAN
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse")
   endif ()
   # This is a set of sensible warnings that provide meaningful output
-  set(OGRE_WARNING_FLAGS "-Wall -Winit-self -Wno-overloaded-virtual -Wcast-qual -Wwrite-strings -Wextra -Wno-unused-parameter -Wshadow -Wno-missing-field-initializers -Wno-long-long")
+  set(OGRE_WARNING_FLAGS "-Wall -Winit-self -Wno-overloaded-virtual -Wcast-qual -Wwrite-strings -Wno-unused-parameter -Wshadow -Wno-missing-field-initializers -Wno-long-long")
   if (NOT APPLE)
-      set(OGRE_WARNING_FLAGS "${OGRE_WARNING_FLAGS} -Wno-unused-but-set-parameter")
+      set(OGRE_WARNING_FLAGS "${OGRE_WARNING_FLAGS}")
   endif ()
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OGRE_WARNING_FLAGS}")
 endif ()
@@ -427,6 +427,7 @@ set(OGRE_LIB_DIRECTORY "lib${LIB_SUFFIX}" CACHE STRING
 option(OGRE_PROFILING "Enable internal profiling support." FALSE)
 cmake_dependent_option(OGRE_CONFIG_STATIC_LINK_CRT "Statically link the MS CRT dlls (msvcrt)" FALSE "MSVC" FALSE)
 set(OGRE_LIB_DIRECTORY "lib${LIB_SUFFIX}" CACHE STRING "Install path for libraries, e.g. 'lib64' on some 64-bit Linux distros.")
+set(OGRE_LIBDATA_DIRECTORY "libdata" CACHE STRING "Install path for data files.")
 if (WIN32)
 	option(OGRE_INSTALL_VSPROPS "Install Visual Studio Property Page." FALSE)
 	if (OGRE_INSTALL_VSPROPS)
@@ -468,6 +469,7 @@ mark_as_advanced(
   OGRE_PROFILING
   OGRE_CONFIG_STATIC_LINK_CRT
   OGRE_LIB_DIRECTORY
+  OGRE_LIBDATA_DIRECTORY
 )
 
 ###################################################################