Help needed with external module

I'm trying to provide a new external module and battling with the concept for the first time. a0# strings /usr/lib/apache/1.3/libphp4.so | grep rad radius_dir radlog_dir radius_functions php_if_radius_auth radius_module_entry php_info_radius rad_getpwnam pairadd php_if_deg2rad php_if_rad2deg /etc/raddb radius_auth radrecv: Reply from host %lx code=%d, id=%d, length=%d radius radius.log rad2deg deg2rad ./configure '--with-radius=yes' '--with-mysql' '--with-xml' '--enable-track-vars' '--with-apxs' .. and here is a test script below, <?php $ret = radius_auth('markc','xxxxx','a0.localnet','safesurf'); print "ret = $ret\n"; ?> ... which gives this response in a browser, Fatal error: Call to undefined function: radius_auth() in /root/php-radius.php on line 2 radius_auth() looks like it is "visible" in the php4 apache module but still comes back as an undefined function. Could anyone spare a hint as to what I might need to yet do to make radius_auth() actually callable ? --markc