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Recently I've been tipping my toes into Ruby/Rails water and I wanted to give the Rails Event Store a try. When I tried to install the gems on Ubuntu, I got an error:

find_executable: checking for pg_config... no

when installing the pg Ruby gem on Ubuntu. Here's how I handled it.

The reason for that is quite obvious: the installer tries to refer a library named pg_config which doesn't exist on my system.

It's also quite obvious it will be included in the postgresql package, but I'm running Postgres in Docker for ages, so I don't want to install Postgres just for the sake of this.

Long story short, just install the following packages using apt:

sudo apt install postgresql-client libpq5 libpq-dev                                                                         │

And with that installed you can install the Rails Event Store dependencies without installing Postgres.