Hello. I am trying to get OpenGL working on my machine using SDL and glew. I've created a class 'Display' that pretty much just sets up the display and provides a place to draw things. I have 11 errors. In the errors it references both constructor and destructor in the Display class. Here is an example of an error: Error 1 error LNK2019: unresolved external symbol _SDL_CreateWindow referenced in function "public: __thiscall Display::Display(int,int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0Display@@QAE@HHABV? $basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) C:\Users\Demx\documents\visual studio 2013\Projects\OpenGLProject\OpenGLProject\Display.obj OpenGLProject I cannot make out head nor tail of anything coming after the reference to Display::Display(int, int etc.) If anyone can interpret some of that I would be grateful. Here is the complete project: https://github.com/TheDemx27/OpenGL-Bootstrap/tree/master/OpenGLProject [Broken] Thanks.