[MacPorts] #28023: qt3 fails to build with libpng 1.4

[MacPorts]

#28023: qt3 fails to build with libpng 1.4
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 Reporter:  dports@…             |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  1.9.2                                
 Keywords:                       |        Port:  qt3                                  
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Comment(by jmr@…):

 Gentoo bug with correct-looking patch:
 http://bugs.gentoo.org/show_bug.cgi?id=319487

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Ticket URL: <https://trac.macports.org/ticket/28023#comment:4>
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