尝试添加 DLTK 3.0 存储库，然后再次安装 ANTLR，以便 Eclipse 可以获取插件并能够管理已安装的 2 个版本的 DLTK.

Try to add the DLTK 3.0 repository and then install ANTLR again, so maybe Eclipse can fetch the plugin and be able to manage the 2 versions of DLTK installed.

存储库是:

http://download.eclipse.org/technology/dltk/updates-dev/3.0-stable/