slime/slime — pull request #128 by Ferada (2014-03-06 21:10:28+00:00)
Title: Add flag to indicate the minimum Emacs version.

So to fix my issue with https://github.com/slime/slime/issues/127 here is an additional flag for `define-slime-contrib` to define the minimum version of Emacs for which a contrib can be loaded.