[MacPorts] #63549: py37-pyqt5 @5.15.4_2: Failed to build py37-pyqt5

[MacPorts]

#63549: py37-pyqt5 @5.15.4_2: Failed to build py37-pyqt5
-------------------------+------------------------
  Reporter:  mklengel    |      Owner:  reneeotten
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  py37-pyqt5  |
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Comment (by dliessi):

 Replying to [comment:8 reneeotten]:
 > Can you check whether you still have {{{py37-pip4}}} installed as well
 and, if so, uninstall that port and try again?

 I was affected by this problem on High Sierra.
 By deactivating `py37-sip4` I was able to update `py37-pyqt5`
 successfully.
 I then reactivated `py37-sip4`.

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Ticket URL: <https://trac.macports.org/ticket/63549#comment:14>
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