FAQ/Cannot Find Package

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I cannot find $package when running nix-env -qaP even with channels configured

Not all packages are listed. Packages may not be listed because:

• the package is unfree, like e.g. unrar and teamspeak_client; see Unfree software for more information
• the package is part of an attribute set and nix-env doesn't recurse into this set (see pkgs.recurseIntoAttrs), use nix-env -qaP -A haskellPackages for listing these entries