# From http://sourceforge.net/projects/libpng/files/libpng16/1.6.21/
md5	3bacb4728f6694a64ad9052769d6a4ce	libpng-1.6.21.tar.xz
sha1	978b2f4e007eda56032001493ddb97d20f0ab291	libpng-1.6.21.tar.xz