anchor.diff:  
   let
     inherit (stdenv.hostPlatform) system;
  -in
  -  stdenv.mkDerivation {
  +  unwrapped = stdenv.mkDerivation {
   
       inherit pname version src sourceRoot;
   
       passthru = {
         inherit executableName tests;
  +      fhs = fhs {};
  +      fhsWithPackages = f: fhs { additionalPkgs = f; };
       };
   
       desktopItem = makeDesktopItem {
  
positive.code:     '';
  
      inherit meta;
    }
  
negative.code: { stdenv, lib, makeDesktopItem
  , unzip, libsecret, libXScrnSaver, libxshmfence, wrapGAppsHook
  , gtk2, atomEnv, at-spi2-atk, autoPatchelfHook
  , systemd, fontconfig, libdbusmenu, buildFHSUserEnvBubblewrap
  , writeShellScriptBin
  
  # Populate passthru.tests
  , tests
  