[MacPorts] #28544: qt3-mac fails to build against libpng14

[MacPorts]

#28544: qt3-mac fails to build against libpng14
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 Reporter:  jan@…            |       Owner:  macports-tickets@…                   
     Type:  defect           |      Status:  new                                  
 Priority:  Normal           |   Milestone:                                       
Component:  ports            |     Version:  1.9.2                                
 Keywords:                   |        Port:  qt3-mac                              
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 Should be related to #28023

 ...
 :info:build kernel/qpngio.cpp:192: warning: 'palette' is deprecated
 (declared at /opt/local/include/png.h:653)
 :info:build kernel/qpngio.cpp:192: warning: 'palette' is deprecated
 (declared at /opt/local/include/png.h:653)
 :info:build kernel/qpngio.cpp:193: error: 'struct png_info_struct' has no
 member named 'trans'

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Ticket URL: <https://trac.macports.org/ticket/28544>
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