rubyPackages.libv8: drop

    '';

  };

  # note that you need version >= v3.16.14.8,

  # otherwise the gem will fail to link to the libv8 binary.

  # see: https://github.com/cowboyd/libv8/pull/161

  libv8 = attrs: {

    buildInputs = [ which nodejs.libv8 python2 ];

    buildFlags = [ "--with-system-v8=true" ];

    dontBuild = false;

    # The gem includes broken symlinks which are ignored during unpacking, but

    # then fail during build. Since the content is missing anyway, touching the

    # files is enough to unblock the build.

    preBuild = ''

      touch vendor/depot_tools/cbuildbot vendor/depot_tools/chrome_set_ver vendor/depot_tools/cros_sdk

    '';

    postPatch = ''

      substituteInPlace ext/libv8/extconf.rb \

        --replace "location = Libv8::Location::Vendor.new" \

                  "location = Libv8::Location::System.new"

    '';

    meta.broken = true; # At 2023-01-20, errors as:

                        #   "Failed to build gem native extension."

                        # Requires Python 2. Project is abandoned.

  };

  execjs = attrs: {

    propagatedBuildInputs = [ nodejs.libv8 ];

  };

    };

    version = "3.17.0.3";

  };

  libv8 = {

    groups = ["default"];

    platforms = [];

    source = {

      remotes = ["https://rubygems.org"];

      sha256 = "0kd4d5x9sxsbpbsk4xp66rxbmj2x3iglwirqws56wp7dzf7cd978";

      type = "gem";

    };

    version = "8.4.255.0.1";

  };

  libxml-ruby = {

    groups = ["default"];

    platforms = [];