nixpkgs/pkgs/development/libraries/libpng/libpng-apng.nix

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{ stdenv, fetchurl, zlib }:
assert zlib != null;
stdenv.mkDerivation rec {
version = "1.4.4";
name = "libpng-${version}";
patch_src = fetchurl {
url = "mirror://sourceforge/project/libpng-apng/libpng-master/${version}/libpng-${version}-apng.patch.gz";
sha256 = "d729a2feacfd80547e06c30343d598302f4417cf2e6f649e4ee617690987bd24";
};
src = fetchurl {
url = "mirror://sourceforge/libpng/${name}.tar.gz";
sha256 = "d07616ba1e9c161017384feb3b576d70c160b970abfd9549ad39a622284b574a";
};
preConfigure = ''
gunzip < ${patch_src} | patch -Np1
'';
propagatedBuildInputs = [ zlib ];
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
};
}