anchor.diff:  
     src = fetchurl rec {
       url = "https://gstreamer.freedesktop.org/src/orc/${name}.tar.xz";
  -    sha256Url = "${url}.sha256sum";
  +    hashOutput = false;
       sha256 = "7d52fa80ef84988359c3434e1eea302d077a08987abdde6905678ebcad4fa649";
     };
   
  
positive.code: { stdenv
  , fetchurl
  
  , xz
  }:
  
negative.code:     "--enable-Bsymbolic"
    ];
  
    passthru = {
      srcVerification = fetchurl {
        inherit (src)
          outputHash
          outputHashAlgo
          urls;
        sha256Urls = map (n: "${n}.sha256sum") src.urls;
        pgpsigUrls = map (n: "${n}.asc") src.urls;
        # Sebastian Dröge
        pgpKeyFingerprint = "7F4B C7CC 3CA0 6F97 336B  BFEB 0668 CC14 86C2 D7B5";
        failEarly = true;
      };
    };
  
    meta = with lib; {
      description = "The Oil Runtime Compiler, a JIT compiler for array operations";
      homepage = http://gstreamer.freedesktop.org/;
      # The source code implementing the Marsenne Twister algorithm is licensed
  