[MacPorts] #61521: xemacs @21.4.22: error: implicitly declaring library function 'exit'

[MacPorts]

#61521: xemacs @21.4.22: error: implicitly declaring library function 'exit'
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  Reporter:  wealthychef1  |      Owner:  dstrubbe
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:  bigsur catalina
      Port:  xemacs        |
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Comment (by wealthychef1):

 Oh, another #include <unistd.h> thing I bet!  Happened with compface
 yesterday.

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Ticket URL: <https://trac.macports.org/ticket/61521#comment:4>
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