You have to provide a body for the following functions, even if it's empty. Vector3::normalize(), Vector3::cross(), Vector3::dot() . For instance.
This is not a problem with OpenGL or it's libraries. It looks like if camera. Cpp uses some different class, but its implementation is either not build or not linked.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.