treewide: remove nested let-in

  libPath = lib.makeLibraryPath [ xorg.libX11 glib gtk3 cairo pango ];

  redirects = [ "/usr/bin/pkexec=${pkexecPath}" ];

in let

  binaryPackage = stdenv.mkDerivation {

    pname = "${pname}-bin";

    version = buildVersion;

  ] ++ lib.optionals (lib.versionAtLeast buildVersion "4145") [

    sqlite

  ];

in

let

  binaryPackage = stdenv.mkDerivation rec {

    pname = "${pnameBase}-bin";

    version = buildVersion;

  perl = perl536;

  # Ruby 3.2

  ruby = ruby_3_2;

in

let

  # Building requires a few system tools to be in PATH.

  # Some of these we could patch into the relevant source files (such as xcodebuild and

  # qlmanage) but some are used by Xcode itself and we have no choice but to put them in PATH.

  }.${stdenv.hostPlatform.system};

  installer = "https://clientupdates.dropboxstatic.com/dbx-releng/client/dropbox-lnx.${arch}-${version}.tar.gz";

in

let

  desktopItem = makeDesktopItem {

    name = "dropbox";

    exec = "dropbox";

let

  pname = "hol4";

  vnum = "14";

in

let

  version = "k.${vnum}";

  longVersion = "kananaskis-${vnum}";

  holsubdir = "hol-${longVersion}";

  kernelFlag = if experimentalKernel then "--expk" else "--stdknl";

in

let

  polymlEnableShared = with pkgs; lib.overrideDerivation polyml (attrs: {

    configureFlags = [ "--enable-shared" ];

  });