[racket] opengl multisampling troubles

Hi all!

I have opengl multi-sampling not working under linux-64.

I have tried set up msaa using gl-config and gl-enable as it desribed in
manual, but that failed.
After that I checked msaa in c+glut and found it works, then I installed
racket win32 under wine and found it works too.
So may it be some bug in implementation? If it is important, I use intel hd
graphics.

.rkt and .c files attached.

-- 
Best regards,
Yuri
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