[racket] open gl

Thank you ahead of time for any help you give me.

I have open gl working on my linux mint version (I think it is 15) and I've verified using glgear at the linux command line.  I've run setup-plt, opened alpha.rkt and run it.  I get a "no gl context available" error. 

(send a-gl-context get-handle)-> #f

(send a-gl-context ok?)-> #t

Does anyone have any ideas of what I might be doing wrong?

Best,
Dan
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