Call to undefined function services_get_server_info() on any basic request

I am using vinculum to send/receive ping/trackbacks between two Drupal sites. It requires xmlrpc to work for pingback.ping.

It tries to hit http://server.com/xmlrpc.php and gets a 500 PHP error. This is the same error in http://drupal.org/node/1260524 however it is not working as designed, or there is some weird configuration that is required somewhere to define an endpoint.

The function that is needed is in services.runtime.inc, which doesn't seem to be included in the normal execution path of a generic request for XML-RPC services.

Error message:

<br />
<b>Fatal error</b>:  Call to undefined function services_get_server_info() in <b>modules/services/servers/xmlrpc_server/xmlrpc_server.module</b> on line <b>42</b><br />

The line is:

$resources = services_get_resources(services_get_server_info('endpoint', ''));

I changed it to this quick, and now the script runs without an error. For some reason services.runtime.inc is not being included in a normal request to xmlrpc.php. I'd submit a patch but this is probably not the best place to put this call, it's almost impossible to find the right spot for it though, and this seems like services.runtime.inc should be included in any service module related request anyway.

module_load_include('runtime.inc', 'services');
$resources = services_get_resources(services_get_server_info('endpoint', ''));