[MacPorts] #51573: libpng: fetch failure (was: opencv failing because libpng dependency not present)

[MacPorts]

#51573: libpng: fetch failure
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  Reporter:  bradnull@…  |      Owner:  ryandesign@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  libpng      |
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Ticket URL: <https://trac.macports.org/ticket/51573#comment:5>
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