# Pastebin sGt7Qopg
       NIX_PATH
           A colon-separated list of directories used to look up Nix expressions enclosed in angle brackets (i.e., <path>). For instance, the value

               /home/eelco/Dev:/etc/nixos

           will cause Nix to look for paths relative to /home/eelco/Dev and /etc/nixos, in this order. It is also possible to match paths against a prefix. For example, the value

               nixpkgs=/home/eelco/Dev/nixpkgs-branch:/etc/nixos

           will cause Nix to search for <nixpkgs/path> in /home/eelco/Dev/nixpkgs-branch/path and /etc/nixos/nixpkgs/path.

           If a path in the Nix search path starts with http:// or https://, it is interpreted as the URL of a tarball that will be downloaded and unpacked to a temporary location. The tarball must consist
           of a single top-level directory. For example, setting NIX_PATH to

               nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-15.09.tar.gz

           tells Nix to download the latest revision in the Nixpkgs/NixOS 15.09 channel.

           A following shorthand can be used to refer to the official channels:

               nixpkgs=channel:nixos-15.09

           The search path can be extended using the -I option, which takes precedence over NIX_PATH.