anchor.diff:  { stdenv
   , fetchurl
   , lib
  +, python3
   , waf
   
   , fftw_double
  
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:     "--enable-wavread"
      "--enable-wavwrite"
      "--disable-docs"
      "--disable-tests"
      "--disable-examples"
    ];
  
    passthru = {
      srcVerification = fetchurl rec {
  