asdf version dependency

https://common-lisp.net/project/asdf/asdf.html#Version-specifiers So I can say that my system depends on a (:version :OTHER "x.y.z") which means a version >= x.y.z. Can I say explicit enforce a dependency of a particular version ? That is version equal of x.y.z instead of greater-than-or-equal x.y.z? Best, Alexandre Rademaker http://arademaker.github.com/