[Dev-C++] linker errors

[Vlada D. <dj...@im...>]

Hi.

I just got a book about games programming and I got stuck in the first step.
When trying to compile an example from the book, I keep getting linker
errors. The output looks like this:

 C:\Visual\engine\main.o
[Warning] In function `GameEngine::GetFrameDelay(void)':
//C/Visual/engine/main.cpp(.bss+0x0) C:\Visual\engine\main.cpp(.bss+0x0)
multiple definition of `_pGame'
//C/Visual/engine/GameEngine.h C:\Visual\engine\skeleton.o(.bss+0x0)
first defined here
 C:\Visual\engine\GameEngine.o
[Warning] In function `_10GameEngineP11HINSTANCE__PcT2UsUsii':

[Linker error] undefined reference to `GameEngine::m_pGameEngine'


I can't figure out what this means. I tried looking for multiple definitions
of   _pGame, but I can't find any. Can something else be causing this?
As for the other error, m_pGameEngine is a member of GameEngine class and
it's referenced only in the class constructor. Can somebody give me a hint
about possible problems?

Thanks.
------------
Vlada