anchor.diff:        buildInputs = [
           pcre libxslt groff ncurses readline python2 libedit
           python2.pkgs.docutils makeWrapper
  -      ];
  +      ] ++ extraBuildInputs;
   
         buildFlags = "localstatedir=/var/spool";
   
  
positive.code: , python2, makeWrapper }:
  
  let
    common = { version, sha256 }:
      stdenv.mkDerivation rec {
        name = "varnish-${version}";
  
  
negative.code:     sha256 = "1cqlj12m426c1lak1hr1fx5zcfsjjvka3hfirz47hvy1g2fjqidq";
    };
    varnish6 = common {
      version = "6.1.0";
      sha256 = "0zg2aqkg7a4zsjpxj0s7mphxv5f9xy279hjwln30h901k18r46qn";
      extraBuildInputs = [ python2.pkgs.sphinx ];
    };
  }
  