[Dev-C++] OpenGL in fullscreen-mode?

[Stein N. <tem...@of...>]

Hi there!

I'm trying to make my OpenGL program run in fullscreen, but when i try this;

if(ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN) != 
DISP_CHANGE_SUCCESSFUL)
...etc :)

It won't work! It's says that it's undefined reference! What do I need to 
include?? What am I missing?

Thanks! :)

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#define stone