$items['user/%user/aprobar_solicitudes'] = array(
        'title'              => 'Aprobar solicitudes',
    'page callback'      => 'solicitudes_mostrar_vista',
    'page arguments'     => array(1),
//   Access callback por defecto es user_access
        'access callback'    => 'user_access',
    'access arguments'   => array('aprobar solicitudes'),
    'weight'             => 6,
    'type'               => MENU_LOCAL_TASK,
  );