[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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 The upgrade of graphviz to 2.26.3_4 fails on my MacBook Pro (10.5.8) with
 the message "ld: library not found for -lpng12".

 I have libpng at 1.4.5_0 installed and active, but it provides libpng and
 libpng14 only.

 I am going to attach the build logfile in case it helps tracking down the
 problem's cause.

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