Here's a short example: #include <boost/smart_ptr.hpp> #include <iostream> namespace ZSystem { namespace Leg { enum Type { INLET = 1, OUTLET = 2 }; } } std::ostream& operator<<(std::ostream&, ZSystem::Leg::Type); #include <boost/utility.hpp> Not sure whats going on here, I just started with a broken compile and reduced it to here.

-----Original Message----- I haven't tracked down what include order is causing this, but I'm getting:

c:\dev\opt\include\boost/utility_fwd.hpp(21) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information

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