Common Lisp and CFFI on OS X can't find your MacPorts libraries?

Consider adding the following to ~/.sbclrc

	#+(and asdf darwin)
	(defmethod asdf:perform :after ((o asdf:load-op) (c (eql (asdf:find-system "cffi"))))
	(let ((library-directories (intern "*FOREIGN-LIBRARY-DIRECTORIES*" (find-package "CFFI"))))
	(set library-directories
	(cons #p"/opt/local/lib/" (symbol-value library-directories)))))

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