Build (or install) Odoo (OpenERP) from the source are needed when a developer wants to deep look in how Odoo work.
1.Install postgresql
sudo apt-get install postgresql postgresql-contrib
cd odoo/
2.Clone odoo source code
git clone https://github.com/odoo/odoo.git
3.install setup tools and lib
sudo apt-get install python3-setuptools python3-setuptools
sudo apt-get install libsasl2-dev python-dev libldap2-dev libssl-dev
4.create odoo postgres user login
sudo -u postgres createuser -s odoo
5.install all requirement library
pip3 install -r requirements.txt
6.test Run odoo
./odoo-bin
7.create module/addon template
./odoo-bin scaffold my_module src/odoo-addons/
8.Active the module in admin GUI
