[MacPorts] #65293: qmake5 PortGroup only works if use_xcode yes is applied to every PortFile that uses it: Project ERROR: Could not resolve SDK Path for 'macosx11' using --show-sdk-path

[MacPorts]

#65293: qmake5 PortGroup only works if use_xcode yes is applied to every PortFile
that uses it: Project ERROR: Could not resolve SDK Path for 'macosx11'
using --show-sdk-path
--------------------------+-----------------------
  Reporter:  cooljeanius  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:  portgroup
      Port:  qtads        |
--------------------------+-----------------------

Comment (by szhorvat):

 I see the opposite behaviour: adding `use_xcode yes` causes "Could not
 resolve SDK Path", removing this line makes it work.

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Ticket URL: <https://trac.macports.org/ticket/65293#comment:25>
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