[MacPorts] #51573: opencv failing because libpng dependency not present

[MacPorts]

#51573: opencv failing because libpng dependency not present
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 Reporter:  bradnull@…     |      Owner:  macports-tickets@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.3.4
 Keywords:  opencv libpng  |       Port:  opencv
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 It looks like the port for opencv is failing because it cannot find libpng
 version 1.6.22 which is not present on and of the distfiles servers.

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Ticket URL: <https://trac.macports.org/ticket/51573>
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