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

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{ stdenv, fetchurl, zlib, xz }:
assert zlib != null;
# If you want to upgrade libpng, look at libpng15 branch
stdenv.mkDerivation rec {
name = "libpng-1.2.47";
src = fetchurl {
url = "mirror://sourceforge/libpng/${name}.tar.xz";
sha256 = "1lai3dnzw81y40jr17bdj1qh08hwv9mc1v74yybl7jdx2hiilsvx";
};
propagatedBuildInputs = [ zlib ];
buildNativeInputs = [ 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
};
}