[MacPorts] #38753: metapixel 1.0.2_3 does not build with libpng 1.5

[MacPorts]

#38753: metapixel 1.0.2_3 does not build with libpng 1.5
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 Reporter:  eekim@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.1.3
 Keywords:  libpng   |       Port:  metapixel
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 I attempted to build it on Mountain Lion 10.8.3. I've attached the log
 excerpt.

 I found a patch from homebrew, which I applied, and it fixes the problem:

 https://gist.github.com/purcell/2281924/download

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Ticket URL: <https://trac.macports.org/ticket/38753>
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