[MacPorts] #35964: fox build failure with libpng @1.5.12

[MacPorts]

#35964: fox build failure with libpng @1.5.12
---------------------------------+------------------------------------------
 Reporter:  jjstickel@…          |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  2.1.2                                
 Keywords:  libpng               |        Port:  fox                                  
---------------------------------+------------------------------------------
 Looks like fox is also experiencing a build error with libpng-1.5.12. From
 the build log:
 {{{
 :info:build fxpngio.cpp:78:18: error: member access into incomplete type
 'png_struct' (aka 'png_struct_def')
 :info:build   longjmp(png_ptr->jmpbuf,1);                           //
 Bail out
 :info:build                  ^
 :info:build /opt/local/include/png.h:854:16: note: forward declaration of
 'png_struct_def'
 :info:build typedef struct png_struct_def png_struct;
 :info:build                ^
 ...
 }}}

 See also #35945, #35948, #35949.

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Ticket URL: <https://trac.macports.org/ticket/35964>
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