[MacPorts] #65619: libfmt @9.x: upstream changes break dependents

[MacPorts]

#65619: libfmt @9.x: upstream changes break dependents
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  Reporter:  mascguy                             |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:  2.7.2
Resolution:                                      |   Keywords:
      Port:  libfmt cantera poac mpd mkvtoolnix  |
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Comment (by mascguy):

 This is also affecting older versions of `mkvoolnix`, used for macOS
 releases 10.14 and earlier. See: issue:65635

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Ticket URL: <https://trac.macports.org/ticket/65619#comment:3>
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