[MacPorts] #35962: compatibility with grace and libpng 1.5

[MacPorts]

#35962: compatibility with grace and libpng 1.5
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 Reporter:  jvianalopes@…          |       Owner:  macports-tickets@…                   
     Type:  request                |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.1.2                                
 Keywords:  libpng                 |        Port:  grace                                
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 Grace doesn't seem to compile after the upgrade of libpng.
 It seems that the solution was already found here:
 https://gist.github.com/1183385

 Thanks in advance
 João

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Ticket URL: <https://trac.macports.org/ticket/35962>
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