Seems like the horrendous screw-up that was the libpng-1.4 update never got fixed properly and is hitting stable users now.
Flameeyes, in his usual in-your-face style, has documented what needs to be done: http://blog.flameeyes.eu/2010/06/29/stable-users-libpng-update If you are a stable user, save yourself a lot of trouble over the next few days, read his blog and do what he says. He has this uncanny ability of almost always being correct on technical toolchain matters -- alan dot mckinnon at gmail dot com
