[racket] What's the version of GTK+ required by Racket?

From: Diogo F. S. Ramos (diogofsr at gmail.com)
Date: Thu May 9 20:35:25 EDT 2013

I'm sorry but I couldn't find a file describing the prerequisites of
Racket where I hoped to find the answer for my question.

What's the version of GTK+ required by Racket?

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