anchor.diff:  
     preInstall = ''
       installFlagsArray+=("SYSCONFDIR=$out/etc")
  -
  -    ! grep -q 'install-headers' Makefile
  -    echo 'install-nix:' >>Makefile
  -    echo $'\t' '+$(MAKE) -C librhash install-headers' >>Makefile
  -    echo $'\t' '+$(MAKE) -C librhash install-so-link' >>Makefile
     '';
   
     installTargets = [
       "install"
       "install-pkg-config"
  -    "install-nix"
  +    "install-lib-headers"
  +    "install-lib-so-link"
     ];
   
     passthru = {
       srcVerification = fetchurl {
         failEarly = true;
  -      pgpsigUrls = map (n: "${n}.asc") src.urls;
  -      pgpKeyFingerprint = "2875 F6B1 C2D2 7A4F 0C8A  F60B 2A71 4497 E373 63AE";
  -      inherit (src) urls outputHash outputHashAlgo;
  +      inherit (src)
  +        urls
  +        outputHash
  +        outputHashAlgo;
  +      fullOpts = {
  +        pgpsigUrls = map (n: "${n}.asc") src.urls;
  +        pgpKeyFingerprint = "2875 F6B1 C2D2 7A4F 0C8A  F60B 2A71 4497 E373 63AE";
  +      };
       };
     };
   
  
positive.code:   src = fetchurl {
      url = "mirror://sourceforge/rhash/rhash/${version}/${name}-src.tar.gz";
      hashOutput = false;
      sha256 = "964df972b60569b5cb35ec989ced195ab8ea514fc46a74eab98e86569ffbcf92";
    };
  
    buildInputs = [
  
negative.code: }:
  
  let
    version = "1.3.7";
  in
  stdenv.mkDerivation rec {
    name = "rhash-${version}";
  