[MacPorts] #65646: yencode @0.46: error: use of undeclared identifier 'EXIT_FAILURE'

[MacPorts]

#65646: yencode @0.46: error: use of undeclared identifier 'EXIT_FAILURE'
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  Reporter:  rehall   |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  yencode  |
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Comment (by ryandesign):

 This software is 20½ years old so it's not surprising it's having trouble
 compiling on modern systems. Implicit declaration of functions became an
 error in Xcode 12; this software was evidently not written with that in
 mind. I will see what I can do.

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Ticket URL: <https://trac.macports.org/ticket/65646#comment:2>
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