Support older compilers with c++0x support but not C++-11

CMakeLists.txt

@@ -165,11 +165,14 @@ endif()
 include(CheckCXXCompilerFlag)
 CHECK_CXX_COMPILER_FLAG(-std=c++14 COMPILER_SUPPORTS_CXX14)
 CHECK_CXX_COMPILER_FLAG(-std=c++11 COMPILER_SUPPORTS_CXX11)
+CHECK_CXX_COMPILER_FLAG(-std=c++0x COMPILER_SUPPORTS_CXX0X)
 
 if(COMPILER_SUPPORTS_CXX14)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
 elseif(COMPILER_SUPPORTS_CXX11)
 	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+elseif(COMPILER_SUPPORTS_CXX0X)
+	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
 else()
 	message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 or C++14 support. Please use a different C++ compiler.")
 endif()