Hello, I'm about to push libpng 1.5.4 as default libpng for mga2 into cauldron soon. There will be some breakage for devtime deps, but I think it won't affect runtime deps. Compat libs for libpng 1.2 will landing at first as libpng12.
Maintainers: If some packages cannot be built against libpng 1.5 even with patches (upstream should be notified), you should adjust the BuildRequires into "pkgconfig(libpng12)", and only rely on pkgconfig or libpng12-config to find libs and includedir, Regards.
