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{ stdenv, fetchurl, zlib, apngSupport ? false}:
assert zlib != null;
let whenPatched = stdenv.lib.optionalString apngSupport;
version = "1.6.2";
patch_src = fetchurl {
url = "mirror://sourceforge/libpng-apng/libpng-${version}-apng.patch.gz";
sha256 = "0fy7p197ilr9phwqqk9h91s1mc28r6gj0w2ilrw5liagi71z75j1";
};
in stdenv.mkDerivation (rec {
name = "libpng" + whenPatched "-apng" + "-${version}";
src = fetchurl {
url = "mirror://sourceforge/libpng/libpng-${version}.tar.xz";
sha256 = "1pljkqjqgyz8c32w8fipd9f0v2gcyhah2ypp0h7ya1r1q85sk5qw";
};
propagatedBuildInputs = [ zlib ];
doCheck = true;
passthru = { inherit zlib; };
meta = {
description = "The official reference implementation for the PNG file format" + whenPatched " with animation patch";
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;
};
} // stdenv.lib.optionalAttrs apngSupport {
postPatch = ''
gunzip < ${patch_src} | patch -Np1
'';
})
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