[MacPorts] #52905: gr-specest: variants cause error.

[MacPorts]

#52905: gr-specest: variants cause error.
--------------------+------------------------
 Reporter:  mf2k    |      Owner:  michaelld
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gr-specest
--------------------+------------------------
 {{{
 $ port info gr-specest
 Error: gr-specest: Variant accelerate conflicts with openblas
 Error: Unable to open port: Error evaluating variants
 }}}

 Please only conditionally set the default_variants if none of the variants
 are being specified already.

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Ticket URL: <https://trac.macports.org/ticket/52905>
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