[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 gilles.celli@…):

 FYI: Removing "-system-libpng" from the config flag doesn't work
 here...trying if QT4 will work with the X11 program I need to install

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Ticket URL: <https://trac.macports.org/ticket/28023#comment:2>
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