{
  packageOverrides = pkgs: with pkgs; {
    # buildEnv is not absolutely equivalent to
    # `nix-env -i -f ./nixRoot/default.nix`, see
    # https://github.com/NixOS/nix/issues/2682
    immaePackages = pkgs.buildEnv {
      name = "Immae-packages";
      paths = builtins.attrValues (import ./nixRoot/default.nix);
      pathsToLink = [ "/bin" "/etc" "/include" "/lib" "/libexec" "/share"];
      extraOutputsToInstall = [ "bin" "man" "doc" "info" ];
    };
  };
}