Where is psycopg2-binary package installed?

I need to install a package (django_heroku) whose dependencies include psycopg2-binary

My repl has psycopg2-binary installed from package manager. To test it, I added another package (psycopg2-pgevents) which also needs psycopg2-binary. It installed correctly. But when I install django_heroku I get this error:

So, I’m trying to find the explicit path to pg_config and add it to $PATH but searching for pg_config in the shell doesn’t return anything. Where are binaries or other files from installed packages usually located in a repl?