Wrong architecture C++? Xcode 4.3
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I am building a Windows based project on my Mac. I have fixed a lot of the errors but when I go to compile it gives the following error:

        Undefined symbols for architecture x86_64:
      "Timer::reset()", referenced from:
          Timer::Timer() in main.o
      "Log::Log()", referenced from:
          __static_initialization_and_destruction_0(int, int)in main.o
      "Log::~Log()", referenced from:
          ___tcf_1 in main.o
      "Render::initSDL(int, int, int)", referenced from:
          init()    in main.o
      "Log::writeError(char*, ...)", referenced from:
          init()    in main.o
          _SDL_main in main.o
      "EntityManager::init(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, int)", referenced from:
          init()    in main.o
      "EntityManager::loadAssets()", referenced from:
          init()    in main.o
      "Level::getBlockCount()", referenced from:
          EntityManager::getBlockCount()       in main.o
      "Level::getBombCount()", referenced from:
          EntityManager::getBombCount()       in main.o
      "Level::getItemCount()", referenced from:
          EntityManager::getItemCount()       in main.o
      "Render::renderElement(int, int, SDL_Surface*, SDL_Rect*)", referenced from:
          renderScene()     in main.o
      "EntityManager::getElement(int, ElementType)", referenced from:
          renderScene()     in main.o
      "Render::finishRender()", referenced from:
          renderScene()     in main.o
      "EntityManager::update()", referenced from:
          _SDL_main in main.o
      "EntityManager::interpolate(double)", referenced from:
          _SDL_main in main.o
    ld: symbol(s) not found for architecture x86_64
    collect2: ld returned 1 exit status

I am curious as to why it only referenced a few functions? Do these functions contain non Mac compatible contents?

For example:

    int Level::getItemCount()
    {
    	return itemVec.size();
    }

itemVec is a vector, just to be clear.

Thanks