Hi, I am trying to port some .NET classes into moder C++ and I am using shared_ptr. I am trying to compile with Visual Studio 2005 and Pocket PC 2003 SDK to target some mobile devices and when I compile I got the following : error unknown CE compiler I have modified visualc.hpp to pass this test by adding : elif _MSC_VER < 2500 //Visual 8 Pocket PC 2003 and WM5 comes with 2048 # define BOOST_COMPILER_VERSION evc4.0 but it's not enough since after I get a problem with Interlocked I think, I had to comment the following : //#elif (defined( BOOST_MSVC ) || defined( BOOST_INTEL_WIN )) // //extern "C" long __cdecl _InterlockedIncrement( long volatile * ); //extern "C" long __cdecl _InterlockedDecrement( long volatile * ); //extern "C" long __cdecl _InterlockedCompareExchange( long volatile *, long, long ); // //# pragma intrinsic( _InterlockedIncrement ) //# pragma intrinsic( _InterlockedDecrement ) //# pragma intrinsic( _InterlockedCompareExchange ) // //# define BOOST_INTERLOCKED_INCREMENT _InterlockedIncrement //# define BOOST_INTERLOCKED_DECREMENT _InterlockedDecrement //# define BOOST_INTERLOCKED_COMPARE_EXCHANGE _InterlockedCompareExchange Now it compiles fine under Pocket PC but it's a bad workaround, if someone could provide a real fix... First thing to do is to check which version is used with Visual Studio 8 and smart devices SDK. If I look at afxver.h it seems to be 0x0800 but not sure that it's the right place to look at. Hope it helps