anchor.diff:  
     luakit = callPackage ../applications/networking/browsers/luakit {
         inherit (lua51Packages) luafilesystem luasqlite3;
  -      lua5 = lua5_1;
         gtk = gtk3;
         webkit = webkitgtk2;
     };
  
positive.code: 
    loudmouth = callPackage ../development/libraries/loudmouth { };
  
    luabind = callPackage ../development/libraries/luabind { lua = lua5_1; };
  
    luabind_luajit = callPackage ../development/libraries/luabind { lua = luajit; };
  
  
negative.code:   ejabberd = callPackage ../servers/xmpp/ejabberd { };
  
    prosody = callPackage ../servers/xmpp/prosody {
      inherit (lua51Packages) luasocket luasec luaexpat luafilesystem luabitop luaevent luazlib;
    };
  
  