[MacPorts] #28202: graphviz 2.26.3_4 build fails due to missing library png12

[MacPorts]

#28202: graphviz  2.26.3_4 build fails due to missing library png12
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  Reporter:  ludwig@…            |       Owner:  macports-tickets@…                   
      Type:  defect              |      Status:  closed                               
  Priority:  Normal              |   Milestone:                                       
 Component:  ports               |     Version:  1.9.2                                
Resolution:  worksforme          |    Keywords:  libpng                               
      Port:  graphviz            |  
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Comment(by miken32@…):

 Replying to [comment:2 nick.lott@…]:
 > I can confirm that  after an initial error followed by  "sudo port clean
 graphviz" the build went fine

 I am still experiencing this problem; multiple cleans and an uninstall
 have not helped, nor has re-installing libpng, nor has doing forced
 upgrades of dependentof:libpng.

 The Portfile doesn't mention the library version which leads me to think
 the problem is elsewhere. Suggestions? I'd really like to be able to use
 the gimp2 and inkscape ports again, which can't upgrade due to
 dependencies on graphviz.

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Ticket URL: <https://trac.macports.org/ticket/28202#comment:4>
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