[MacPorts] #56120: pkg-config fails to find python3

[MacPorts]

#56120: pkg-config 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:  python27 python34 python35          |
  python36 python_select                         |
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Comment (by aleb):

 I noticed this problem while creating a Portfile. Maybe this info should
 be added in the howto for creating a new Portfile. Or in a "Python for
 Portfile authors" page if there is one? (see https://docs.brew.sh/Python-
 for-Formula-Authors)

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Ticket URL: <https://trac.macports.org/ticket/56120#comment:7>
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