[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:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  1.9.2                                
 Keywords:  libpng              |        Port:  graphviz                             
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Comment(by nick.lott@…):

 Replying to [comment:1 ludwig@…]:
 > After another "sudo port clean graphviz" the build went fine - I don't
 know what was the problem before. Anyway, this ticket can be closed.
 >
 > Sorry for the noise.
 I can confirm that  after an initial error followed by  "sudo port clean
 graphviz" the build went fine

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Ticket URL: <https://trac.macports.org/ticket/28202#comment:2>
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