[MacPorts] #62991: m4 @1.4.19+universal: configure: error: Cannot find a type to use in place of socklen_t

[MacPorts]

#62991: m4 @1.4.19+universal: configure: error: Cannot find a type to use in place
of socklen_t
---------------------------+--------------------------
  Reporter:  FaradayLight  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  arm64 bigsur
      Port:  m4            |
---------------------------+--------------------------

Comment (by ShadSterling):

 Just ran in to this error trying to upgrade `diffutils @3.7_0+universal
 (active)`.  I don't think it has been reported on tons of other ports,
 this was the only result in my search for `socklen_t` that was less than 3
 years old.  Is this the same problem affecting multiple ports that should
 all be collected in this ticket, or should I open a separate ticket for
 diffutils?

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Ticket URL: <https://trac.macports.org/ticket/62991#comment:31>
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