I want to install in my eclipse Indigo the plugin m2e-wtp, that allow maven to build .war files.
I tried the using the market place and also the Install software option, but what I get is this:

In the website https://www.eclipse.org/m2e-wtp/download/ I see a message that says:
Please note that, m2e-wtp and Sonatype’s m2eclipse-wtp overlap and can
not be installed together.
But I don’t understand if is this my case. I checked my installed plugins, and I don’t see Sonatype mentioned anywhere, see this image of my m2e installed plugins:

I thought that maybe it was already installed so I tried to import a maven project that requires this plugin from an svn location and also from my local workspace, but it didn’t work:

What is missing in my eclipse, why I cant projects that require the m2e-wtp plugin?
You are not seeing the plugin in your installed plugins because installation failed:
From: http://marketplace.eclipse.org/content/maven-integration-eclipse-wtp
You should install
m2e-wtpthrough Eclipse Marketplace. Just be careful to actully installm2e-wtpand notm2eclipse-wtp(simply search for "m2e-wtp" as some searches actually bring up the old m2eclipse-wtp plugin). The m2e plugins have groupId oforg.eclipse.m2e.