Installation of CLE is straightforward, simply use the Eclipse Update Manager

  1. From the Eclipse menu choose Help|Software Updates
  2. Switch to the Available Software tab if needed
  3. Press Add Site
  4. Fill-in the dialog box with CLE update location:
  5. In the Update window, you will now see the CUP/LEX category; select it then press Install.
  6. Confirm the installation by pressing Finish.
  7. Wait for the Update Manager to finish the plugin installation.
  8. Press Yes to restart Eclipse.
  9. That's all!