The xcode project has not been entirely updated to libpng-1.4.0. It needs to *not* depend on pnggccrd.c or pngvcrd.c It needs to PNG_CONFIGURE_LIBPNG in the CFLAGS while building the library, but not while building an application. If an updated version is not received, this project will be removed when libpng-1.4.0 is released.