[MacPorts] #59740: py34-matplotlib depends on nonexistent ports

[MacPorts]

#59740: py34-matplotlib depends on nonexistent ports
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  Reporter:  ryandesign                          |      Owner:  reneeotten
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.6.2
Resolution:                                      |   Keywords:
      Port:  py-matplotlib, py-gobject3, py-     |
  pyqt5, py-pyside, py-seaborn                   |
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Comment (by michaelld):

 I just added those 3. Openmaintainer & simple changes. Verified they build
 on 10.14 latest everything, but if Py37 worked then Py38 should also work.

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Ticket URL: <https://trac.macports.org/ticket/59740#comment:5>
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