[MacPorts] #38506: tmux: does not build on 10.4

[MacPorts]

#38506: tmux: does not build on 10.4
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  Reporter:  200309@…  |      Owner:  yeled@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.1.3
Resolution:            |   Keywords:
      Port:  tmux      |
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Comment (by jmr@…):

 libproc.h is part of dtrace, which was added in 10.5. Apparently tmux uses
 proc_pidinfo to find out some stuff. Who knows how it would have done it
 in the olden days before dtrace...

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Ticket URL: <https://trac.macports.org/ticket/38506#comment:9>
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