CI_Loader::add_package_path()

add_package_path($path[, $view_cascade = TRUE])

Adding a package path instructs the Loader class to prepend a given path for subsequent requests for resources. As an example, the “Foo Bar” application package above has a library named Foo_bar.php. In our controller, we’d do the following:

$this->load->add_package_path(APPPATH.'third_party/foo_bar/')
        ->library('foo_bar');