yes, I had a look, I'm specifically looking for the gl2.h, gl2ext,h, egl.h and eglext.h files and their accompanying lib or so files, which are not in that download (though interestingly gl.h is)
I might have missed them but I did a search through and found nothing.
I have sent mails to Imagination and Actions, so I am hoping they will come though eventually, though I suspect Imaginations will say to contact the vendor as they usually don't supply the libs directly.
There are S500 libs available on the Lemaker site for their S500 based guitar SBC so I might try those this weekend when I get round to doing some more coding.
That's for the pointers though.