title: Installing m2e connectors manually
body: <p>I'm using <em>Eclipse Mars</em>, and I have a Maven application using <code>build-helper-maven-plugin</code>, that is not covered by <code>m2e</code> by default, so I need to add a connector. The point is, I can add the connector when importing the maven project:</p>
  
  <p><a href="https://i.stack.imgur.com/aR683.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aR683.png" alt="enter image description here"></a></p>
  
  <p>However, I have no idea how I would do this manually, when the project is already in the workspace. The pom have an error, <code>Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:build-helper-maven-plugin:1.10:add-source</code>, but I can't find the option <code>install m2e connector</code> or something like that.</p>