What am I doing wrong...

cmd output

$ nix-build pkgs/tools/X11/touchegg/default.nix --dry-run
error: cannot auto-call a function that has an argument without a default value (‘stdenv’)

pkgs-tools-X11-touchegg-default.nix

{ stdenv, fetchurl, libX11, Qt4, libXtst, libXext }:

stdenv.mkDerivation rec {
  name = "touchegg-1.1.1";

  src = fetchurl {
    url = "https://touchegg.googlecode.com/files/${name}.tar.gz";
    sha256 = "95734815c7219d9a71282f3144b3526f2542b4fa270a8e69d644722d024b4038";
  };

  buildInputs = [ libX11 libXtst libXext ];

  configurePhase = "qmake PREFIX=$out";

  buildPhase = "make";

  installPhase = ''
    mkdir -p $out/usr/bin
    mkdir -p $out/usr/lib
    mkdir -p $out/usr/share
    make install BASEDIR=$out
  '';

  meta = {
    homepage = "https://code.google.com/p/touchegg/";
    description = "Macro binding for touch surfaces";
    license = stdenv.lib.licenses.gpl2;
  };
}

pkgs-top-level-all-packages.nix

...

  thinkfan = callPackage ../tools/system/thinkfan { };

  touchegg = callPackage ../tools/X11/touchegg {
    inherit stdenv fetchurl libX11 libXtst libXext;
  };

  tup = callPackage ../development/tools/build-managers/tup { };

...