[MacPorts] #54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra

[MacPorts]

#54151: qjackctl @0.45+qt4: variant +qt4 fails to build on Sierra
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  Reporter:  detlevd   |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.1
Resolution:            |   Keywords:
      Port:  qjackctl  |
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Comment (by michaelld):

 Yes, this fix does seem to work. I wish we didn't need to call qmake
 though. So I started looking into the issue inside qmake & have found the
 code & logic. I'm trying to figure out a reasonable patch. I'll check the
 Qt5 code to see what it does.

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Ticket URL: <https://trac.macports.org/ticket/54151#comment:13>
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