Description of problem: Newer firefox, thunderbird, xulrunner, and seamonkey require APNG support and refuse to build against libpng that doesn't have APNG support. A patch against 1.2.16 is available at: http://littlesvr.ca/apng/ References: http://www.vlad1.com/~vladimir/projects/apng/AnimatedPNG.html https://bugzilla.mozilla.org/show_bug.cgi?id=257197
I'm not touching that. See if you can get upstream to accept it.