anchor.diff:    version = "0.166";
   
     src = fetchurl {
  -    urls = [
  -      "https://fedorahosted.org/releases/e/l/elfutils/${version}/${name}.tar.bz2"
  -      "mirror://gentoo/${name}.tar.bz2"
  -    ];
  +    urls = tarballUrls version;
  +    allowHashOutput = false;
       sha256 = "3c056914c8a438b210be0d790463b960fc79d234c3f05ce707cbff80e94cba30";
     };
   
  
positive.code:   inherit (stdenv.lib)
      optionals
      optionalString;
  in
  
  stdenv.mkDerivation rec {
  
negative.code:     "--disable-sanitize-undefined"
    ];
  
    passthru = {
      srcVerified = fetchurl rec {
        failEarly = true;
        urls = tarballUrls "0.166";
        pgpsigUrls = map (n: "${n}.sig") urls;
        pgpKeyId = "57816A6A";
        pgpKeyFingerprint = "47CC 0331 081B 8BC6 D0FD  4DA0 8370 665B 5781 6A6A ";
        inherit (src) outputHashAlgo;
        outputHash = "3c056914c8a438b210be0d790463b960fc79d234c3f05ce707cbff80e94cba30";
      };
    };
  
    meta = with stdenv.lib; {
      description = "Libraries/utilities to handle ELF objects";
      homepage = https://fedorahosted.org/elfutils/;
  