Find a way to install Nix on your preferred platform of choice. Here is a short list of current methods of install:
Use dnf or apt to manage the nix install.
https://github.com/nix-community/nix-installers/
This is the official method to install nix. It however can be slightly buggy, especially under SELinux enabled distributions, such as Fedora.
Keep in mind you will need to add the following to either
~/.config/nix/nix.conf or /etc/nix/nix.conf to get flakes to work correctly:
experimental-features = nix-command flakeshttps://nix.dev/tutorials/install-nix
An external company's attempt to create a better install script than the official methods. May work better if the previous two approaches are insufficient.
https://github.com/DeterminateSystems/nix-installer
You need to find a way to install direnv with at least version 2.23.0 to
work correctly inside this repository.
Use your preferred package manager (apt/dnf/pacman/...) to install direnv.
For a list of packages, see here: https://repology.org/project/direnv
A tip is that you can also install this through Nix if your preferred method of installation does not include a recent enough version of direnv.
While the recommended methods of using nix is through nix shell and
nix run, or through programs such as nixos-rebuild and home-manager,
a simple (but frowned upon) method is to use nix profile install.
This will mimmic the likes of traditional package managers like apt or dnf.
Please read more about how this works in the below link, and further see the page: Introduction to Nix.
https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-profile.html