Uh, there was other thread which referred to this:
http://www2.indigorenderer.com/joomla/forum/viewtopic.php?t=1302

Might be a solution, even if it's not what you asked.

I'll check Indigo after I can get those renderers I already have working (Yafray works, Sunflow kind of works, Virtualight and Kerkythea... well...).