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Created attachment 1165 [details]
Patch for building png support with libpng 1.5.16

Building the current hg version of SDL_image fails for libpng 1.5.16 since rev 4c41cee3e961 as png_struct_rp is not defined for that version of libpng. Other minor releases of libpng15 might be affected as well.

[...]
_SAFE -MT IMG_png.lo -MD -MP -MF .deps/IMG_png.Tpo -c ../IMG_png.c  -fPIC -DPIC -o .libs/IMG_png.o
../IMG_png.c:84: error: expected ')' before 'png_ptr'
../IMG_png.c:85: error: expected ';' before 'png_structp'
../IMG_png.c: In function 'IMG_InitPNG':
../IMG_png.c:115: error: 'struct <anonymous>' has no member named 'png_create_info_struct'
../IMG_png.c:116: error: expected declaration specifiers or '...' before 'png_const_structrp'
../IMG_png.c:118: error: 'struct <anonymous>' has no member named 'png_create_info_struct'
../IMG_png.c:122: error: 'struct <anonymous>' has no member named 'png_create_read_struct'
[...]

A patch is attached.