Assuming you always want to use the same version of swank-clojure (which is also a lane stroke), you can run (for leiningen 1.x):
lein plugin install swank-clojure "1.5.0-SNAPSHOT"
For leiningen 2.x, you can add the following: plugins in the profile.clj file of your lein directory:
[lein-swank "1.5.0-SNAPSHOT"]
and the plugin will be used from all your leiningen projects without specifying requirements in the project file.
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