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

[MacPorts]

#39228: R +cairo require +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
 Keywords:           |       Port:  R
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 If the cairo port is installed with the +quartz variant, then R compiles
 and runs just fine with only the +cairo variant and no +x11 variant. Is
 there a way to detect how cairo is installed and enable +x11 as necessary?
 Maybe check whether ${prefix}/lib/pkgconfig/cairo-quartz.pc exists?

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