[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@…):

 Looks like an easy fix.
 http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt
 {{{
    a. We changed the names of the png_struct and info_struct members
 "trans"
       and "trans_values" to "trans_alpha" and "trans_color", respectively.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28023#comment:3>
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