anchor.diff:    luacheck = buildLuaPackage rec {
       pname = "luacheck";
       version = "0.20.0";
  -    name = "${pname}${version}";
  +    name = "${pname}-${version}";
   
       src = fetchFromGitHub {
         owner = "mpeterv";
  
positive.code:       install -p bit.so $out/lib/lua/${lua.luaversion}
      '';
  
      meta = {
        homepage = "http://bitop.luajit.org";
        maintainers = with maintainers; [ flosse ];
      };
    };
  
negative.code:     name = "zlib-${version}";
      version = "1.1";
  
      src = fetchFromGitHub {
        owner = "brimworks";
        repo = "lua-zlib";
        rev = "v${version}";
        sha256 = "1520lk4xpf094xn2zallqgqhs0zb4w61l49knv9y8pmhkdkxzzgy";
      };
  
  