anchor.diff:    propagatedBuildInputs = [
       cheetahTemplate numpy scipy matplotlib pyqt4 pygtk wxPython pyopengl
     ];
  +
  +  enableParallelBuilding = true;
   
     preConfigure = ''
       export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -Wno-unused-variable"
  
positive.code: 
  stdenv.mkDerivation rec {
    name = "gnuradio-${version}";
    version = "3.7.8.1";
  
    src = fetchurl {
      url = "http://gnuradio.org/releases/gnuradio/${name}.tar.gz";
      sha256 = "1ap5gbgisnbny3jbnm2i5wm2sy6qkbhz747av3sjxp2z12fz81l4";
    };
  
    buildInputs = [
  
negative.code:     homepage = http://www.gnuradio.org;
      license = licenses.gpl3;
      platforms = platforms.linux;
      maintainers = with maintainers; [ bjornfor fpletz ];
    };
  }
  