[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 reneeotten):

 In [changeset:"744522eb4a6b6f0b2ce97886e3da4e6aa410d1b7/macports-ports"
 744522eb4a6b6f0b2ce97886e3da4e6aa410d1b7/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="744522eb4a6b6f0b2ce97886e3da4e6aa410d1b7"
 spice-gtk: specify Python version used for build

 See: https://trac.macports.org/ticket/62212
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62212#comment:9>
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