Several virtual servers with different log files?

Hi, I have a freeRadius 2.1.7 server with three virtual servers listening to different kinds of clients. I would like to know whether it is possible to define different log files for these virtual servers, instead of the global log file defined in radiusd.conf. Reading the README file inside the sites-available directory, it seems that it is not possible to define a 'log' section in a virtual server. Thanks for the help, Francisco Javier Valdera.