[MacPorts] #25507: kdelibs4 undefined symbols "_png_set_longjmp_fn"

[MacPorts]

#25507: kdelibs4 undefined symbols "_png_set_longjmp_fn"
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  Reporter:  Pavel.Vondricka@…           |       Owner:  snc@…           
      Type:  defect                      |      Status:  reopened        
  Priority:  Normal                      |   Milestone:                  
 Component:  ports                       |     Version:  1.9.1           
Resolution:                              |    Keywords:                  
      Port:  kdelibs4                    |  
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Comment(by snc@…):

 So now the question is: how to programmatically avoid this, or should I
 just check for that file and warn the user if it's found?

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Ticket URL: <https://trac.macports.org/ticket/25507#comment:25>
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