You can install Legato source packages and build it from scratch.

Please review the Requirements.

Downloads and other info available from the Developer Zone
https://developer.sierrawireless.com/landing/legato.aspx

Install Software to load up the software.

Setup Target once Legato is installed and built.

You're ready to Develop Apps.

Advanced Target Topics if you're a Yocto whiz, and you want to customize or rebuild the target.

Copyright (C) Sierra Wireless, Inc. 2014. Use of this work is subject to license.