FIX CMakeLists.txt to compile only if C++11 support is available

CMakeLists.txt

@@ -37,15 +37,11 @@ endif(UNIX)
 #Set compiler according C++11 support
 include(CheckCXXCompilerFlag)
 CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
-CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
 if(COMPILER_SUPPORTS_CXX11)
 		message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has C++11 support.")
         set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-elseif(COMPILER_SUPPORTS_CXX0X)
-		message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has C++0x support.")
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
 else()
-        message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
+        message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
 endif()
 
 ## Tests ##