[MacPorts] #28024: qrencode 3.1.1_1 does not build with libpng 1.4

[MacPorts]

#28024: qrencode 3.1.1_1 does not build with libpng 1.4
----------------------------------+-----------------------------------------
 Reporter:  raphael@…             |       Owner:  brett@…           
     Type:  defect                |      Status:  new               
 Priority:  Normal                |   Milestone:                    
Component:  ports                 |     Version:  1.9.2             
 Keywords:  png                   |        Port:  qrencode          
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 The relevant part of the build log is:

 {{{
 checking for png... configure: error: Package requirements ("libpng12")
 were not met:

 No package 'libpng12' found
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28024>
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