[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 michaelld@…):

 Not a great surprise, given how old qt3 is ... try removing the configure
 flag "-system-libpng" so that qt3 uses its internal version instead of the
 system-provided version.  "We" might want to create a "libpng12" port that
 installs into $[prefix}/libexec, just for ports such as this one that,
 generally, cannot easily be made compatible with newer libpng versions.

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Ticket URL: <https://trac.macports.org/ticket/28023#comment:1>
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