anchor.diff:  { gcc9Stdenv, lib, stdenv, fetchFromGitHub, cmake, gettext, pkg-config, gpgme, libsolv, openssl, check
  -, json_c, libmodulemd, libsmartcols, sqlite, librepo, libyaml, rpm }:
  +, json_c, libmodulemd, libsmartcols, sqlite, librepo, libyaml, rpm, zchunk }:
   
   gcc9Stdenv.mkDerivation rec {
     pname = "libdnf";
  
positive.code:     "-DWITH_GTKDOC=OFF"
      "-DWITH_HTML=OFF"
      "-DWITH_BINDINGS=OFF"
      "-DWITH_ZCHUNK=OFF"
    ];
  
    meta = with lib; {
  
negative.code:     libsmartcols
      libyaml
      libmodulemd
      zchunk
    ];
  
    propagatedBuildInputs = [
  