PS: SBCL 1.1.16 and later don't have this error. 

In 1.1.11 sb-posix.asd contains full system definition,
while in 1.1.16 sb-posix.asd contains just one line: (defsystem :sb-posix 
:class require-system),
so I think ASDF just doesn't try to signal the warning.

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