[MacPorts] #62212: spice-gtk: Meson build fails with "Python module six not found" with Python 3.9

[MacPorts]

#62212: spice-gtk: Meson build fails with "Python module six not found" with Python
3.9
------------------------------+----------------------
  Reporter:  rseichter        |      Owner:  danchr
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:
      Port:  spice-gtk meson  |
------------------------------+----------------------

Comment (by rseichter):

 Thanks for investigating this. With the latest changes by @reneeotten I
 was able to update spice-gtk and virt-manager on my machine. The attempt
 to open an existing QEMU VM in virt-manager results in the error message
 shown below, for which I should probably open a separate bug report.
 Still, it is progress of sorts, so thanks again.

 {{{
 Error launching details: could not get a reference to type class

 Traceback (most recent call last):
   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/share
 /virt-manager/virtManager/vmwindow.py", line 40, in get_instance
     cls._instances[key] = vmmVMWindow(vm)
   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/share
 /virt-manager/virtManager/vmwindow.py", line 82, in __init__
     self._details = vmmDetails(self.vm, self.builder, self.topwin,
   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/share
 /virt-manager/virtManager/details/details.py", line 397, in __init__
     self._xmleditor = vmmXMLEditor(self.builder, self.topwin,
   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/share
 /virt-manager/virtManager/xmleditor.py", line 44, in __init__
     self._init_ui()
   File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/share
 /virt-manager/virtManager/xmleditor.py", line 69, in _init_ui
     self._srcview = GtkSource.View()
 TypeError: could not get a reference to type class
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62212#comment:10>
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