[MacPorts] #59554: rbmake: error: incomplete definition of type 'struct png_struct_def'

[MacPorts]

#59554: rbmake: error: incomplete definition of type 'struct png_struct_def'
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  rbmake
------------------------+--------------------
 [https://build.macports.org/builders/ports-10.15_x86_64-builder/builds/583/steps
 /install-port/logs/stdio rbmake doesn't build]:

 {{{
 pngimage.c:38:23: error: incomplete definition of type 'struct
 png_struct_def'
     if (setjmp(png_ptr->jmpbuf)) {
                ~~~~~~~^
 /opt/local/include/png.h:439:16: note: forward declaration of 'struct
 png_struct_def'
 typedef struct png_struct_def png_struct;
                ^
 pngimage.c:104:23: error: incomplete definition of type 'struct
 png_struct_def'
     if (setjmp(png_ptr->jmpbuf)) {
                ~~~~~~~^
 /opt/local/include/png.h:439:16: note: forward declaration of 'struct
 png_struct_def'
 typedef struct png_struct_def png_struct;
                ^
 2 errors generated.
 make[1]: *** [pngimage.o] Error 1
 }}}

 It's not compatible with recent libpng. Usually this can be easily
 patched. Since this change in libpng was so long ago, somebody may already
 have a patch for this that we can find and use.

-- 
Ticket URL: <https://trac.macports.org/ticket/59554>
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