[MacPorts] #28019: enblend incompatibility with libpng 1.4.x

[MacPorts]

#28019: enblend incompatibility with libpng 1.4.x
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 Reporter:  ryandesign@…             |       Owner:  hvdwolf@…        
     Type:  defect                   |      Status:  new              
 Priority:  Normal                   |   Milestone:                   
Component:  ports                    |     Version:  1.9.2            
 Keywords:                           |        Port:  enblend          
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 Now that libpng has been updated to 1.4.5, there are lots of warnings when
 building enblend, but the error preventing the build from finishing is:
 {{{
 png.cxx:278: error: 'png_set_gray_1_2_4_to_8' was not declared in this
 scope
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28019>
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