Hello. Has the semantics of :depends-on with :version specified for the dependency changed recently? I am asking, because I observe problems in several libraries. For example, moptilities. moptilities.asd has :depends-on ((:version :closer-mop "0.55")) In Quicklisp 2013-11-11 closer-mop is updated, now its ASDF system has :version "1.0.0" Now moptilities fails to load on many lisps (clisp, ccl-1.8, ccl-1.8, ecl, sbcl-1.1.0.36). The error is MISSING-DEPENDENCY-OF-VERSION: Component :CLOSER-MOP does not match version 0.55, required by #<SYSTEM "moptilities"> But on sbcl-1.1.11 moptilities load OK. This is a relatively recent SBCL, so I assume it has newer ASDF than many other lisps. And probably that's why it it can load moptilities. Also interesting, that in the previous Quicklisp closer-mop version was "0.61". And moptilities, which depend on closer-mop "0.55" was loaded successfully by many lisps which now fail. Test results for moptilities for the current and previous Quiclisp may be found here: http://common-lisp.net/project/cl-test-grid/library/moptilities.html Moptilities is only on example, there are other libraries affected by this problem. So, my question is: how :depends-on ((:version ...)) should work, and is the change in the behavior intentional? Best regards, - Anton