v/vlib/pg/README.md

Before you can use this module, you must first have PostgreSQL installed on your system. To do this, find your OS and perform the actions listed.

NOTE: These instructions are meant only as a convenience. If your OS is not listed or you need extra help, go here.

Fedora 31

sudo dnf install postgresql-server postgresql-contrib
sudo systemctl enable postgresql # to autostart on startup
sudo systemctl start  postgresql

Debian 10/11

sudo apt-get install postgresql postgresql-client
sudo systemctl enable postgresql # to autostart on startup
sudo systemctl start  postgresql

MacOSX (Homebrew)

brew install postgresql
brew services start postgresql