FAQ/Cannot Find Package

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 The appropriate FAQ entry for installing unfree packages
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