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extraAutoPlugins lets you list plugins and plugin directories to be autoconfigured, and extraPlugins lets you enable plugins on a one-by-one basis. This can be used to enable plugins from contrib (although you'll need to download and check out contrib yourself, then point these options at it), or plugins you've written yourself.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.