[MacPorts] #56241: jack @ 1.9.12_0 fails to build on 10.10.5

[MacPorts]

#56241: jack @ 1.9.12_0 fails to build on 10.10.5
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  Reporter:  ci42    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  jack    |
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Comment (by mf2k):

 I see this on 10.12.6 too.

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Ticket URL: <https://trac.macports.org/ticket/56241#comment:2>
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