anchor.diff:      echo "Checking that 'http' module loads, i.e. lua search paths work:"
       echo "modules.load('http')" > test-http.lua
       echo -e 'quit()' | env -i "$out"/bin/kresd -a 127.0.0.1#53535 -c test-http.lua
  -  '');
  +  '';
   
   in result
  
positive.code: 
  result = if extraFeatures then wrapped-full else unwrapped;
  
  inherit (stdenv.lib) optional optionals concatStringsSep;
  lua = luajitPackages;
  
  # FIXME: remove these usages once resolving
  # https://github.com/NixOS/nixpkgs/pull/63108#issuecomment-508670438
  exportLuaPathsFor = luaPkgs: ''
    export LUA_PATH='${ concatStringsSep ";" (map lua.getLuaPath  luaPkgs)}'
    export LUA_CPATH='${concatStringsSep ";" (map lua.getLuaCPath luaPkgs)}'
  '';
  
  unwrapped = stdenv.mkDerivation rec {
    pname = "knot-resolver";
  
negative.code: 
    preConfigure = ''
      patchShebangs scripts/
    '';
  
    nativeBuildInputs = [ pkgconfig meson ninja ];
  
  