[MacPorts] #70352: gtk3 fails to pass legacy-support include flag

[MacPorts]

#70352: gtk3 fails to pass legacy-support include flag
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  Reporter:  barracuda156                 |      Owner:  mascguy
      Type:  defect                       |     Status:  assigned
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:  2.9.3
Resolution:                               |   Keywords:
      Port:  gtk3, legacy-support, meson  |
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Comment (by mascguy):

 Replying to [comment:7 fhgwright]:
 > It seems pretty clear that this is not an issue with `legacy-support`
 itself, so the latter should probably be removed from the blame list.

 Agreed, though there's a chance we //might// be able to improve the
 situation in the portgroup. (Hard to say, haven't looked too closely at it
 yet.)

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Ticket URL: <https://trac.macports.org/ticket/70352#comment:8>
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