[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:  macports-tickets@…                   
     Type:  request                      |      Status:  new                                  
 Priority:  Normal                       |   Milestone:  MacPorts 2.0.4                       
Component:  ports                        |     Version:  2.0.3                                
 Keywords:  png developer include files  |        Port:  libpng                               
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 I am unable to compile zint-barcode with MacPorts. I need png.h. I see
 png.h in the X11 directory but not in the macports directories.

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