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

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{ stdenv, fetchurl, zlib, apngSupport ? false }:
assert zlib != null;
let
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version = "1.6.13";
sha256 = "09g631h1f1xvrdiy36mh1034r9w46damp9jcg7nm507wlmacxj6r";
patch_src = fetchurl {
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url = "mirror://sourceforge/libpng-apng/libpng-${version}-apng.patch.gz";
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sha256 = "017pnxp3zhhlh6mg2yqn5xrb6dcxc5p3dp1kr46p8xx052i0hzqb";
};
whenPatched = stdenv.lib.optionalString apngSupport;
in stdenv.mkDerivation rec {
name = "libpng" + whenPatched "-apng" + "-${version}";
src = fetchurl {
url = "mirror://sourceforge/libpng/libpng-${version}.tar.xz";
inherit sha256;
};
postPatch = whenPatched "gunzip < ${patch_src} | patch -Np1";
propagatedBuildInputs = [ zlib ];
doCheck = true;
passthru = { inherit zlib; };
meta = with stdenv.lib; {
description = "The official reference implementation for the PNG file format" + whenPatched " with animation patch";
homepage = http://www.libpng.org/pub/png/libpng.html;
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license = licenses.libpng;
platforms = platforms.all;
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maintainers = [ maintainers.vcunat maintainers.fuuzetsu ];
};
}