[MacPorts] #56120: pkgconfig fails to find python3

[MacPorts]

#56120: pkgconfig fails to find python3
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  Reporter:  aleb    |      Owner:
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.4.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by jmroot):

 Putting python3.pc in the default pkgconfig search path is bad for
 ReproducibleBuilds. Fine to link python-2.7.pc, python-3.6.pc and so on.

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Ticket URL: <https://trac.macports.org/ticket/56120#comment:3>
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