[MacPorts] #72530: mpstats broken on El Capitan, It's OK on Sequoia

[MacPorts]

#72530: mpstats broken on El Capitan, It's OK on Sequoia
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  Reporter:  snowflake  |      Owner:  neverpanic
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.99
Resolution:             |   Keywords:
      Port:  mpstats    |
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Comment (by snowflake):

 "I think we are looking at a system shell bug."  or maybe we aren't. It's
 hard to tell.

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Ticket URL: <https://trac.macports.org/ticket/72530#comment:8>
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