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/* Terrible backward compatibility hack to get the path to Nixpkgs
from here. Usually, that's the relative path ‘../..’. However,
when using the NixOS channel, <nixos> resolves to a symlink to
nixpkgs/nixos, so ‘../..’ doesn't resolve to the top-level Nixpkgs
directory but one above it. So check for that situation. */
if builtins.pathExists ../../.version then import ../..
else if builtins.pathExists ../../nixpkgs then import ../../nixpkgs
else abort "Can't find Nixpkgs, please set ‘NIX_PATH=nixpkgs=/path/to/nixpkgs’."
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