Nix overlays for purerl

To add the overlays to your nixpkgs, add default.nix to the overlay path like:

$ ln -s $(pwd)/default.nix $HOME/.config/nixpkgs/overlays/purerl.nix

And to install a purerl package, run:

$ nix-env -iA nixpkgs.purerl.purerl-0-0-7

Then purerl command should be ready as:

$ purerl --version
0.0.7