anchor.diff:      installShellCompletion --cmd luarocks --zsh <($out/bin/luarocks completion zsh)
     '';
   
  -  propagatedNativeBuildInputs = [ zip unzip cmake ];
  +  propagatedBuildInputs = [ zip unzip cmake ];
   
     # unpack hook for src.rock and rockspec files
     setupHook = ./setup-hook.sh;
  
positive.code: {lib, stdenv, fetchFromGitHub
  , buildPackages
  , curl, makeWrapper, which, unzip
  , lua
  # for 'luarocks pack'
  
negative.code:     fi
    '';
  
    nativeBuildInputs = [ makeWrapper installShellFiles ];
  
    buildInputs = [ lua curl which ];
  
  