[MacPorts] #54493: libnetpbm 10.79.02_1 fails to build (still!) with python-3.6 -- makeman

[MacPorts]

#54493: libnetpbm 10.79.02_1 fails to build (still!) with python-3.6 -- makeman
------------------------+-------------------
  Reporter:  gnw3       |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.1
Resolution:             |   Keywords:
      Port:  libnetpbm  |
------------------------+-------------------
Changes (by gnw3):

 * Attachment "makeman.diff" added.

 attempt to support python3

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Ticket URL: <https://trac.macports.org/ticket/54493>
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