anchor.diff:  
   (defsystem :cl-log.test
     :serial t
  -  :version 1.0
  +  :version "1.0"
     :depends-on (:cl-log :stefil)
     :components ((:file "test/logger")
                  (:file "test/speed")))
  
positive.code: 
  (defsystem :cl-log
    :serial t
    :version 1.0
    :depends-on (:bordeaux-threads 
                 :cl-ppcre
                 :demacs)
  
negative.code: (defmethod perform ((op test-op) (system (eql (find-system :cl-log))))
    (operate 'load-op :cl-log.test)
    (in-package :cl-log.test)
    (eval (read-from-string "(stefil:funcall-test-with-feedback-message 'cl-log.test:test)"))
    (values))
  