Obviously it'll take quite longer to port TBNL to ECL than just compiling it. When I tried to run the simplest possible thing:

(asdf:oos 'asdf:load-op :tbnl)
(tbnl:start-tbnl)

I got a lot of:
;;; Warning: accept-tcp-connection not supported on this implementation
;;; Warning: accept-tcp-connection not supported on this implementation
....

Rado