{ stdenv, fetchurl, zlib, xz }: assert zlib != null; stdenv.mkDerivation rec { name = "libpng-1.2.50"; src = fetchurl { url = "mirror://sourceforge/libpng/${name}.tar.xz"; sha256 = "1rz8v3cvy1zzpagxn91lj8swb9vf75rz3yyi18v7zb4jihgzh927"; }; propagatedBuildInputs = [ zlib ]; nativeBuildInputs = [ xz ]; passthru = { inherit zlib; }; meta = { description = "The official reference implementation for the PNG file format"; homepage = http://www.libpng.org/pub/png/libpng.html; license = "free-non-copyleft"; # http://www.libpng.org/pub/png/src/libpng-LICENSE.txt }; }