[MacPorts] #36311: arb broken by libpng15

[MacPorts]

#36311: arb broken by libpng15
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 Reporter:  matt.cottrell@…      |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.2
 Keywords:  maintainer haspatch  |       Port:  arb
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 The attached patches are a short term fix for the arb port which was
 broken by the upgrade to libpng15

 An arb user brought this to my attention with Ticket #36271.

 I have contacted the upstream developer about updating arb to libpng15
 compatibility.

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Ticket URL: <https://trac.macports.org/ticket/36311>
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