[MacPorts] #28049: pango 1.28.3 fails to build (libpng 1.4.5)

[MacPorts]

#28049: pango  1.28.3 fails to build (libpng 1.4.5)
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 Reporter:  alexander.zimmermann@…               |       Owner:  ryandesign@…           
     Type:  defect                               |      Status:  new                    
 Priority:  Normal                               |   Milestone:                         
Component:  ports                                |     Version:  1.9.2                  
 Keywords:                                       |        Port:  pango                  
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Comment(by jmr@…):

 If that doesn't help, run this script to check for ports referencing
 libpng12.

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Ticket URL: <https://trac.macports.org/ticket/28049#comment:2>
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