XF 1.3 Installation Error - iconv.internal_encoding is deprecated

[tmr]

Coming back to my old license for a small forum between friends XF 1.3.3

Any ideas other than upgrade?

Thanks,

Server Error
iconv_set_encoding(): Use of iconv.internal_encoding is deprecated

1. XenForo_Application::handlePhpError()
2. iconv_set_encoding() in Zend/Validate/Hostname.php at line 521
3. Zend_Validate_Hostname->isValid() in Zend/Validate/EmailAddress.php at line 487
4. Zend_Validate_EmailAddress->_validateHostnamePart() in Zend/Validate/EmailAddress.php at line 546
5. Zend_Validate_EmailAddress->isValid() in XenForo/Helper/Email.php at line 64
6. XenForo_Helper_Email::isEmailValid() in XenForo/DataWriter/User.php at line 673
7. XenForo_DataWriter_User->_verifyEmail()
8. call_user_func_array() in XenForo/DataWriter.php at line 982
9. XenForo_DataWriter->_runVerificationCallback() in XenForo/DataWriter.php at line 725
10. XenForo_DataWriter->_isFieldValueValid() in XenForo/DataWriter.php at line 643
11. XenForo_DataWriter->set() in XenForo/DataWriter.php at line 995
12. XenForo_DataWriter->bulkSet() in XenForo/Install/Model/Install.php at line 302
13. XenForo_Install_Model_Install->insertAdministrator() in XenForo/Install/Controller/Install.php at line 265
14. XenForo_Install_Controller_Install->actionStep3b() in XenForo/FrontController.php at line 347
15. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
16. XenForo_FrontController->run() in /home/cars/public_html/forum/install/index.php at line 18