anchor.diff:  
     version "$stableVersion"
     if OS.mac?
  -    if Hardware::CPU.is_64_bit?
  -      url "$_urlBase/stable/release/${revisions['stable']}/${_x64Files['mac']}"
  -      sha256 "${hashes['stable'][_x64Files['mac']]}"
  -    else
  -      url "$_urlBase/stable/release/${revisions['stable']}/${_ia32Files['mac']}"
  -      sha256 "${hashes['stable'][_ia32Files['mac']]}"
  -    end
  +    url "$_urlBase/stable/release/${revisions['stable']}/${_x64Files['mac']}"
  +    sha256 "${hashes['stable'][_x64Files['mac']]}"
     elsif OS.linux? && Hardware::CPU.intel?
       if Hardware::CPU.is_64_bit?
         url "$_urlBase/stable/release/${revisions['stable']}/${_x64Files['linux']}"
  
positive.code:   devel do
      version "$devVersion"
      if OS.mac?
        if Hardware::CPU.is_64_bit?
          url "$_urlBase/dev/release/${revisions['dev']}/${_x64Files['mac']}"
          sha256 "${hashes['dev'][_x64Files['mac']]}"
        else
          url "$_urlBase/dev/release/${revisions['dev']}/${_ia32Files['mac']}"
          sha256 "${hashes['dev'][_ia32Files['mac']]}"
        end
      elsif OS.linux? && Hardware::CPU.intel?
        if Hardware::CPU.is_64_bit?
          url "$_urlBase/dev/release/${revisions['dev']}/${_x64Files['linux']}"
  
negative.code:   'linux-arm': 'sdk/dartsdk-linux-arm64-release.zip',
  };
  const _ia32Files = {
    'linux': 'sdk/dartsdk-linux-ia32-release.zip',
    'linux-arm': 'sdk/dartsdk-linux-arm-release.zip',
  };
  