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> Thank you, I guess this will fix it. In another thread, I read that this > is the behaviour of EGCS to build the vtable if and only if it has all > methods of the class present at compile-time (I can understand that, it > is _really_ hard to build fractions of a vtable). You must have misread that: It doesn't need all of them, it needs a specific one (of course, applications shouldn't rely on that). It can quite happily create a vtable with missing functions: the linker will then complain about the missing functions. As Mike points out, the standard requires you to define all virtual functions of a class if you create instances of it. Regards, Martin