step 1
Install opengl on your device. I am using ubuntu but you can use any os. I installed opengl from here.
step 2
Creating a window is the hard...
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What is glFlush() for in this context?
if you remove it the background color will not be white (for linux anyway) but thanky you for the question :)
I was wondering why my project didn't need a glFlush to change the background color, but it calls a function called glutSwapBuffers that apparently does an implicit glFlush. It was cool to find out, thanks for the post!