[MacPorts] #56120: pkgconfig fails to find python3

[MacPorts]

#56120: pkgconfig fails to find python3
---------------------+-------------------
  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 kencu):

 {{{
 /opt/custom/Library/Frameworks/Python.framework/Versions/3.6/lib/pkgconfig
 }}}
 is not a default search directory for pkg-config files.

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Ticket URL: <https://trac.macports.org/ticket/56120#comment:2>
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