[MacPorts] #39381: gimp-gap @2.6.0 configure fails if cairo doesn't have +quartz

[MacPorts]

#39381: gimp-gap @2.6.0 configure fails if cairo doesn't have +quartz
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  Reporter:  dstrubbe@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.1.3
Resolution:              |   Keywords:
      Port:  gimp-gap    |
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Comment (by egall@…):

 Looks like another case for the `active_variants` portgroup...

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Ticket URL: <https://trac.macports.org/ticket/39381#comment:2>
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