anchor.diff:  }:
   
   stdenv.mkDerivation rec {
  -  name = "aubio-0.4.6";
  +  name = "aubio-0.4.9";
   
     src = fetchurl {
  -    url = "https://aubio.org/pub/aubio-0.4.6.tar.bz2";
  -    multihash = "QmZMM52LgnqXZi99b1SvPk2zWKziSvBMBkDzvcEWm36NHJ";
  -    sha256 = "bdc73be1f007218d3ea6d2a503b38a217815a0e2ccc4ed441f6e850ed5d47cfb";
  +    url = "https://aubio.org/pub/${name}.tar.bz2";
  +    multihash = "QmYBrPimdabcJmFYECZkuU3CN9HEodenk7zZkBuRHypxRt";
  +    sha256 = "d48282ae4dab83b3dc94c16cf011bcb63835c1c02b515490e1883049c3d1f3da";
     };
   
     nativeBuildInputs = [
  
positive.code:         outputHash
          outputHashAlgo
          urls;
        md5Urls = map (n: "${n}.md5") urls;
        sha256Urls = map (n: "${n}.sha256") urls;
        pgpsigUrls = map (n: "${n}.asc") urls;
        # Paul Brossier
        pgpKeyFingerprint = "B88A 5072 D491 5AEC F81A  2434 6A49 B197 28AB DD92";
        failEarly = true;
      };
    };
  
negative.code:     libsndfile
    ];
  
    postPatch = ''
      grep -q "'python" tests/wscript_build
      sed -i "s,'python,'${python3}/bin/python3," tests/wscript_build
  
      # Remove vendored waf
      rm -rv waflib/
    '';
  
    wafFlags = [
      "--disable-fftw3f"  # single
      "--enable-fftw3"  # double
  