nixpkgs/pkgs/development/libraries/libpng/default.nix

{ stdenv, fetchurl, zlib }:

assert zlib != null;

stdenv.mkDerivation rec {
  name = "libpng-1.6.3";

  src = fetchurl {
    url = "mirror://sourceforge/libpng/${name}.tar.xz";
    sha256 = "0i8gz8mbkygc0ny7aa2i2wiavysxy6fdaphl52l49fb3hv9w1v65";
  };

  propagatedBuildInputs = [ zlib ];

  doCheck = true;

  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
    platforms = stdenv.lib.platforms.all;
  };
}