First: should i open a bug for this? The problem is from the new libpng 1.4.0: this evening i just updated this lib, and now i get compile error in dlls/windowscodecs/pngformat.c I'm still investigating the issue to find a solution, but the change that introduced this is clear, directly from their README: Removed deprecated functions png_read_init, png_write_init, png_info_init, png_permit_empty_plte, png_set_gray_1_2_4_to_8, and removed the deprecated macro PNG_MAX_UINT.
So, what should WINE do? I see two actions that need to be performed: 1- check the libpng version in configure 2- adjust pngformat.c to work with the new lib.
For a short term solution, needed also in the long term one (in the beginning), configure should give error if libpng isn't < 1.4.0 In the long term, while distros begin to ship libpng 1.4.0, the main developers of windowscodecs should work out a code solution. What is that i cannot say, since i don't really know the code, but i think it won't be a few minutes of work...
This could apply also to libjpeg since it bumped to 8.0, but i didn't try that part yet.