[MacPorts] #26263: pngmeta: undefined symbols (doesn't build)

[MacPorts]

#26263: pngmeta: undefined symbols (doesn't build)
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 Reporter:  macports@…             |       Owner:  macports-tickets@…                   
     Type:  defect                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  1.9.1                                
 Keywords:                         |        Port:  pngmeta                              
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Comment(by vinc17@…):

 Adding -Wall confirms that functions like png_crc_finish() are no longer
 declared:
 {{{
 pngmeta.c:122: warning: implicit declaration of function ‘png_crc_finish’
 }}}
 It seems they (at least some of them) were never part of the official
 libpng API, so that they have been removed without notice from libpng. The
 pngmeta.c code still has:
 {{{
 #define PNG_INTERNAL
 }}}
 So, if pngmeta relied on libpng internals, I'm not surprised that it can
 no longer be built.

 Note that Debian has a modified version of pngmeta.

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Ticket URL: <https://trac.macports.org/ticket/26263#comment:6>
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