[MacPorts] #39181: tmux fails on 10.4.11

[MacPorts]

#39181: tmux fails on 10.4.11
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 Reporter:  phildobbin@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:  10.4.11       |       Port:  tmux
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 tmux fails to build on 10.4.11.

 First error message is 'libproc.h' is missing.

 Log attached

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Ticket URL: <https://trac.macports.org/ticket/39181>
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