message: Require c++11 and disable compiler-specific extensions
diff: @@ -13,7 +13,10 @@ cmake_minimum_required(VERSION 2.8.11)
  set(USER_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/config/user.cmake" CACHE PATH
  "Path to optional user configuration file.")
  +# Require C++11 and disable compiler-specific extensions
  set(CMAKE_CXX_STANDARD 11)
  +set(CMAKE_CXX_STANDARD_REQUIRED ON)
  +set(CMAKE_CXX_EXTENSIONS OFF)
  # Load user settings before the defaults - this way the defaults will not
  # overwrite the user set options. If the user has not set all options, we still
  