I tried FAIRLY-STABLE this morning, and had some problems: In swank-sbcl.lisp preferred-communication-style there were complaints that the linux_no_threads_p symbol was undefined. I'm using SBCL 0.8.16, Linux 2.6.11.6, and glibc 2.3.2. (Unconditionally returning :spawn works.) In swank.lisp clear-repl-results, there seems to be one superflous closing parenthesis.