[MacPorts] #62991: m4 @ 1.4.19+universal Failed to configure

[MacPorts]

#62991: m4 @ 1.4.19+universal Failed to configure
---------------------------+--------------------------
  Reporter:  FaradayLight  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  arm64 bigsur
      Port:  M4            |
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Comment (by ryanmcgrath):

 I experience the same configure errors on a 2020 M1 MBP - macOS 11.4,
 Xcode 12.5, reinstalled command line tools recently as well.

 The inability to install this +universal is a bit of a sticking point as
 it blocks a number of other packages. I spent some time looking into it
 but unfortunately have no real clue what's up - it builds and runs fine if
 I grab the source and jump through the steps myself, though.

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Ticket URL: <https://trac.macports.org/ticket/62991#comment:11>
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