[MacPorts] #61609: libid3tag @0.15.1b: configure: error: /bin/ksh ./config.sub -apple-darwin20.1.0 failed

[MacPorts]

#61609: libid3tag @0.15.1b: configure: error: /bin/ksh ./config.sub -apple-
darwin20.1.0 failed
-------------------------+--------------------
  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  arm64
      Port:  libid3tag   |
-------------------------+--------------------

Comment (by azakkerman):

 I have a fork of libid3tag with upgraded automake/autoconf which compiles
 on M1: https://github.com/azakkerman/libid3tag

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Ticket URL: <https://trac.macports.org/ticket/61609#comment:1>
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