With so many layers, manually cloning each of them and adding them to your project's conf/bblayers.conf file is cumbersome. The community uses the repo tool developed by Google for their community Android to simplify the installation of Yocto.

To install repo in your host system, type in the following commands:

$ mkdir -p ${HOME}/bin/
$ curl https://storage.googleapis.com/git-repo-downloads/repo >  
  ${HOME}/bin/repo
$ chmod a+x ${HOME}/bin/repo 

The repo tool is a Python utility that parses an XML file, called manifest, with a list of Git repositories. The repo tool is then used to manage those repositories as a whole.