[MacPorts] #69214: qt6: *.pc files required by pkg-config are missing

[MacPorts]

#69214: qt6: *.pc files required by pkg-config are missing
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  Reporter:  jyssh   |      Owner:  MarcusCalhoun-Lopez
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  qt6     |
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Comment (by i0ntempest):

 A trivial patch removing the condition on that variable can get those *.pc
 files installed. Is that something we want to do?

 I got to this when trying to make gnuplot link Qt6, and gnuplot relies on
 pkgconfig to find Qt.

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Ticket URL: <https://trac.macports.org/ticket/69214#comment:5>
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