anchor.diff:        ++ lib.optional withPrimus primus
         ++ extraPkgs pkgs;
   
  +  ldPath = map (x: "/steamrt/${steam-runtime-wrapped.arch}/" + x) steam-runtime-wrapped.libs
  +           ++ lib.optionals (steam-runtime-wrapped-i686 != null) (map (x: "/steamrt/${steam-runtime-wrapped-i686.arch}/" + x) steam-runtime-wrapped-i686.libs);
  +
  +  runSh = writeScript "run.sh" ''
  +    #!${stdenv.shell}
  +    runtime_paths="${lib.concatStringsSep ":" ldPath}"
  +    if [ "$1" == "--print-steam-runtime-library-paths" ]; then
  +      echo "$runtime_paths"
  +      exit 0
  +    fi
  +    export LD_LIBRARY_PATH="$runtime_paths:$LD_LIBRARY_PATH"
  +    exec "$@"
  +  '';
  +
   in buildFHSUserEnv rec {
     name = "steam";
   
  
positive.code:     targetPkgs = commonTargetPkgs;
      inherit multiPkgs extraBuildCommands;
  
      runScript =
        let ldPath = map (x: "/steamrt/${steam-runtime-wrapped.arch}/" + x) steam-runtime-wrapped.libs
                   ++ lib.optionals (steam-runtime-wrapped-i686 != null) (map (x: "/steamrt/${steam-runtime-wrapped-i686.arch}/" + x) steam-runtime-wrapped-i686.libs);
        in writeScript "steam-run" ''
          #!${stdenv.shell}
          run="$1"
          if [ "$run" = "" ]; then
            echo "Usage: steam-run command-to-run args..." >&2
            exit 1
          fi
          shift
          export LD_LIBRARY_PATH=${lib.concatStringsSep ":" ldPath}:$LD_LIBRARY_PATH
          exec "$run" "$@"
        '';
    };
  }
  
negative.code:     ${lib.optionalString (steam-runtime-wrapped-i686 != null) ''
        ln -s ../lib32/steam-runtime steamrt/${steam-runtime-wrapped-i686.arch}
      ''}
      ln -s ${runSh} steamrt/run.sh
    '';
  
    extraInstallCommands = ''
  