Let's make it easy to work with Closure and Clojure.
When/if JDK7 is released, this will be modified to use the file watch API, and thus become free of dependencies. Until then, this library requires JPathWatch, which implements the same API. Download JPathWatch from http://jpathwatch.wordpress.com, and then install the JAR into Maven with the command
mvn install:install-file -Dfile=jpathwatch-0-92a.jar -DgroupId=jpathwatch -DartifactId=jpathwatch -Dversion=0.92a -Dpackaging=jar
JPathWatch will now be available from Leiningen.
Similarly, you'll also need the Closure compiler, which is not available on any well-known Maven repositories at this time. You can download the compiler.jar from the Closure Compiler site, unzip the file to get the jar, and install it into Maven with this command
mvn install:install-file -Dfile=compiler.jar -DgroupId=composure -DartifactId=closure-compiler -Dversion=20100616 -Dpackaging=jar
The Closure Compiler will now be available from Leiningen.