[racket] how to declare dependency on Racket 6.0?

From: Matthew Butterick (mb at mbtype.com)
Date: Thu Jul 3 19:22:56 EDT 2014

On closer inspection, it seems possible that my recent install problems were a side effect of Racket being installed as a package dependency by my Pollen package, where the info.rkt contains this line: 

(define deps '(("racket" #:version "6.0") ... )

Is this the wrong way to declare this kind of dependency? Basically I just want to signal that the package will not work with Racket 5.x.x.

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