#<PACKAGE THREADS> has no external symbol with name "MT-MUTEX"

Hello,

I have one program that worked, but now I see it
does not work any more, cannot figure out why
suddenly.

Can it be due to newest changes in the development
version?

This is the error:

#<INPUT BUFFERED FILE-STREAM CHARACTER
         #P"/home/data1/protected/lib/lisp/quicklisp-WORK/dists/quicklisp/software/bordeaux-threads-v0.8.6/src/impl-clisp.lisp"
         @31>
      : #<PACKAGE THREADS> has no external symbol with name "MT-MUTEX"

-- 
Jean Louis

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