anchor.diff:  
   stdenv.mkDerivation rec {
     name = "gnuradio-${version}";
  -  version = "3.7.8.1";
  +  version = "3.7.9.1";
   
     src = fetchurl {
       url = "http://gnuradio.org/releases/gnuradio/${name}.tar.gz";
  -    sha256 = "1ap5gbgisnbny3jbnm2i5wm2sy6qkbhz747av3sjxp2z12fz81l4";
  +    sha256 = "0zlnxyqq3dyrg0nz2hpydlhyzv26vlkdavs8w01k448lxkqz01lw";
     };
   
     buildInputs = [
  
positive.code:     homepage = http://www.gnuradio.org;
      license = licenses.gpl3;
      platforms = platforms.linux;
      maintainers = [ maintainers.bjornfor ];
    };
  }
  
negative.code:   propagatedBuildInputs = [
      cheetahTemplate numpy scipy matplotlib pyqt4 pygtk wxPython pyopengl
    ];
  
    enableParallelBuilding = true;
  
    preConfigure = ''
      export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -Wno-unused-variable"
  