anchor.diff:  { stdenv, fetchurl, pkgconfig, gnutls, jansson, liburcu, lmdb, libcap_ng, libidn
  -, systemd, nettle, libedit, zlib, libiconv
  +, systemd, nettle, libedit, zlib, libiconv, fetchpatch
   }:
   
   # Note: ATM only the libraries have been tested in nixpkgs.
  
positive.code:     url = "http://secure.nic.cz/files/knot-dns/knot-${version}.tar.xz";
      sha256 = "0y9nhp9lfmxv4iy1xg7l4lfxv4168qhag26wwg0dbi0zjpkd790b";
    };
  
    outputs = [ "bin" "out" "dev" ];
  
  
negative.code: 
    enableParallelBuilding = true;
  
    CFLAGS = [ "-O2" "-DNDEBUG" ];
  
    #doCheck = true; problems in combination with dynamic linking
  
  