I just tried to setup and run the latest version of the Linux dedicated server on my FreeBSD 4.8 machine.
I already had the Linux-base installed but this thread indicates you need the debian version of it but I dont use it. And it works. Though I mounted the linproc as indicated in the thread, though dont know if that is needed, but I just wanted to be sure BF would know my CPU speed.
Though I had to brandelf the binary as indicated by this thread.