[MacPorts] #54309: libnetpbm @10.78.05_1: build fails if default python is python36

[MacPorts]

#54309: libnetpbm @10.78.05_1: build fails if default python is python36
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  Reporter:  mndavidoff         |      Owner:  ryandesign
      Type:  defect             |     Status:  accepted
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:
Resolution:                     |   Keywords:
      Port:  libnetpbm, netpbm  |
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Comment (by mndavidoff):

 I thought of a couple of possible approaches to fix the problem.

 1. Make the port depend on python27 and arrange for python27 to run
 `makeman`, or
 1. Patch `makeman` to change `raise exc_type, exc_value, exc_traceback` to
 just `raise`, which automatically re-raises the last exception that was
 active in the current scope in both Python 2 and Python 3 without the need
 to specify `exc_type, exc_value, exc_traceback`.

 Thanks!

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Ticket URL: <https://trac.macports.org/ticket/54309#comment:2>
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