[MacPorts] #49780: provide an interface for ports to depend on Qt5 components

[MacPorts]

#49780: provide an interface for ports to depend on Qt5 components
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  Reporter:  RJVB         |      Owner:  mkae
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  qt5 qt5-kde  |
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Comment (by RJVB):

 Yes, and see #51619 .

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Ticket URL: <https://trac.macports.org/ticket/49780#comment:9>
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