This is an Xcode 2.2.1 project file for the PNG library. It creates a universal framework if you should happen to need it. Pretty spiffy, eh?
Uncompress this into the libpng-1.2.8/projects dir and then open the project using xcode. Easy!
To make this a private framework (or embeddable framework), execute the following command in Terminal from the same directory that the libpng.framework
folder is in:
install_name_tool -id @executable_path/../Frameworks/libpng.framework/Versions/1.2.8/libpng libpng.framework/libpng
get libpng-1.2.8 sources (external)