As I said, png-1.5 now forbids access to internal struct members.
Compilerwise, without the patch, it looks like this:
src/video/obj/../png.c: In function 'LoadGraphicPNG':
src/video/obj/../png.c:136: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:215: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:219: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:227: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:273: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:274: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:275: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:276: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:277: error: dereferencing pointer to incomplete type
src/video/obj/../png.c:278: error: dereferencing pointer to incomplete type
src/video/obj/../png.c: In function 'SaveScreenshotPNG':
src/video/obj/../png.c:334: error: dereferencing pointer to incomplete type
As I said, png-1.5 now forbids access to internal struct members. obj/../ png.c: In function 'LoadGraphicPNG': obj/../ png.c:136: error: dereferencing pointer to incomplete type obj/../ png.c:215: error: dereferencing pointer to incomplete type obj/../ png.c:219: error: dereferencing pointer to incomplete type obj/../ png.c:227: error: dereferencing pointer to incomplete type obj/../ png.c:273: error: dereferencing pointer to incomplete type obj/../ png.c:274: error: dereferencing pointer to incomplete type obj/../ png.c:275: error: dereferencing pointer to incomplete type obj/../ png.c:276: error: dereferencing pointer to incomplete type obj/../ png.c:277: error: dereferencing pointer to incomplete type obj/../ png.c:278: error: dereferencing pointer to incomplete type obj/../ png.c: In function 'SaveScreenshot PNG': obj/../ png.c:334: error: dereferencing pointer to incomplete type
Compilerwise, without the patch, it looks like this:
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/
src/video/