; caught STYLE-WARNING:
; SB-THREAD:GET-MUTEX has been deprecated as of SBCL 1.0.37.33. Use
; SB-THREAD:GRAB-MUTEX instead.
The attached patch requires 1.0.38, which appears to have been
released April 2010.
Support for 2.5+ year old compilers may or may not be desirable when
weighed against a style-warning. I don't have a strong opinion.