You can download the library from [http://www.mediafire.com/?ottnmmjzadg3mnh here]. Please refer to the README.TXT for installation instructions.
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You can download the libwiisprite library from [http://www.mediafire.com/?ottnmmjzadg3mnh here]. You will need [http://sourceforge.net/projects/devkitpro/files/portlibs/libpng-1.4.1-ppc.tar.bz2/download libpng] installed to use it. Please refer to the README.TXT for further installation instructions.