pyxattr: render available on Darwin (#476848)

{

  lib,

  pkgs,

  attr,

  fetchPypi,

  stdenv,

  buildPythonPackage,

}:

  # IOError: [Errno 95] Operation not supported (expected)

  doCheck = false;

  buildInputs = with pkgs; [ attr ];

  buildInputs = lib.optional (lib.meta.availableOn stdenv.buildPlatform attr) attr;

  meta = {

    description = "Python extension module which gives access to the extended attributes for filesystem objects available in some operating systems";

    license = lib.licenses.lgpl21Plus;

    inherit (pkgs.attr.meta) platforms;

    # Darwin doesn't need `attr` for this.

    platforms = lib.platforms.linux ++ lib.platforms.darwin;

  };

}