[MacPorts] #39228: R +cairo requires +x11 variant unnecessarily in some cases

[MacPorts]

#39228: R +cairo requires +x11 variant unnecessarily in some cases
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  Reporter:  mmoll@…  |      Owner:  kjell.konis@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.1.3
Resolution:           |   Keywords:
      Port:  R        |
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Comment (by ryandesign@…):

 Replying to [ticket:39228 mmoll@…]:
 > Is there a way to detect how cairo is installed and enable +x11 as
 necessary?

 There's the active_variants 1.1 portgroup...

 This issue was brought up again in #40042.

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Ticket URL: <https://trac.macports.org/ticket/39228#comment:4>
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