After we install the needed packages into our development host system, we need to get the Poky source code that can be downloaded with Git by using the following command:
$ git clone git://git.yoctoproject.org/poky -b rocko
Learn more about Git at http://git-scm.com.
After the download process is complete, we should have the following contents inside the poky directory:

The examples and code presented in this and the next chapters use the Yocto Project Version 2.4. The code name is Rocko, as the reference.