$ [sudo] pip install PyBOMBS
If you do want to install the latest version from git, but still use pip, you run the following command:
$ [sudo] pip install [--upgrade] git+https://github.com/gnuradio/pybombs.git
Add a list of recipes, e.g. by running
$ pybombs recipes add gr-recipes git+https://github.com/gnuradio/gr-recipes.git
$ pybombs recipes add gr-etcetera git+https://github.com/gnuradio/gr-etcetera.git
Install GNU Radio, gr-osmosdr and some other goodies into your home directory ~/prefix:
$ pybombs prefix init ~/prefix -a myprefix -R gnuradio-default
Run GNU Radio Companion from your new prefix:
$ source ~/prefix/setup_env.sh
$ gnuradio-companion