[MacPorts] #35946: graphviz fails to compile after updating to libpng 1.5

[MacPorts]

#35946: graphviz fails to compile after updating to libpng 1.5
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 Reporter:  hugo.at.ribeiro@…          |       Owner:  macports-tickets@…                   
     Type:  defect                     |      Status:  new                                  
 Priority:  Normal                     |   Milestone:                                       
Component:  ports                      |     Version:  2.1.2                                
 Keywords:                             |        Port:                                       
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Comment(by ryandesign@…):

 In this case it is not graphviz itself but rather one of its dependencies
 that needs to be recompiled for libpng 1.5. We are currently in the
 process of identifying and recompiling those packages. It may take a few
 days for us to complete this.

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Ticket URL: <https://trac.macports.org/ticket/35946#comment:2>
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