Installing Parallels Tools on NixOS

Question

How to declaratively install Parallels Tools on NixOS which is running as a guest in Parallels for Mac?

Answer 1

I know you figured this out but for future searchers like myself:

Add the following to your /etc/nixos/configuration.nix file:

nixpkgs.config.allowUnfree = true;
hardware.parallels.enable = true;

Note however that at the moment it appears to be broken.