In the DeformableChipmunk Demo, I got a lot of 'implicit declaration in C99' errors for the following code segment in Xcode 4.6. Including the OpenGL headers resolved it. It has been a couple of versions of Xcode since I ran it last and it worked fine.
-Jay
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-(void)drawUnderlay
{
glPixelZoom(PIXEL_SIZE, -PIXEL_SIZE);
glWindowPos2f(0, 480);
glDrawPixels(sampler.width, sampler.height, GL_LUMINANCE, GL_UNSIGNED_BYTE, [sampler.pixelData bytes]);
}