Hi, I attempt to port program from x86 to arm, so I move the code from vc7.1 to evc4. But I encounter some problem.... By include <boost/utility.hpp>, I use class noncopyable to a base class, and derive my own class from noncopyable. In vc7.1 it works fine, while evc4 doesn't. Error message: error C2504: 'noncopyable' : base class undefined Any suggestion? Best Regards.