anchor.diff:  , giflib
   , pkg-config
   }:
  -let
  +stdenv.mkDerivation rec {
  +  pname = "skippy-xd";
  +  version = "unstable-2015-03-01";
  +  src = fetchFromGitHub {
  +    owner = "richardgv";
  +    repo = "skippy-xd";
  +    rev = "397216ca67074c71314f5e9a6e3f1710ccabc29e";
  +    sha256 = "sha256-iP6g3iS1aPPkauBLHbgZH/l+TXbWyIJ2TmbrSiNTkn0=";
  +  };
  +  nativeBuildInputs = [ pkg-config ];
     buildInputs = [
       xorgproto
       libX11
  
positive.code: { lib
  , stdenv
  , fetchgit
  , xorgproto
  , libX11
  , libXft
  
negative.code:     libXinerama
      libjpeg
      giflib
    ];
    makeFlags = [ "PREFIX=$(out)" ];
    preInstall = ''
      sed -e "s@/etc/xdg@$out&@" -i Makefile
    '';
    meta = with lib; {
      description = "Expose-style compositing-based standalone window switcher";
      license = licenses.gpl2Plus;
      maintainers = with maintainers; [ raskin ];
      platforms = platforms.linux;
    };
  }
  