[MacPorts] #31937: Unable to find png.h or png developer port

[MacPorts]

#31937: Unable to find png.h or png developer port
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 Reporter:  digitalrinaldo@…             |       Owner:  ryandesign@…           
     Type:  defect                       |      Status:  new                    
 Priority:  Normal                       |   Milestone:                         
Component:  ports                        |     Version:  2.0.3                  
 Keywords:  png developer include files  |        Port:  libpng                 
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Comment(by digitalrinaldo@…):

 This is an issue with zint-2.4.2

 They have moved to cmake and it doesn't finde dependencies in /opt/local.

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Ticket URL: <https://trac.macports.org/ticket/31937#comment:2>
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