Pack all clojure-contrib sources into a JAR. Compile those that can
be compiled standalone if the clojure.jar property points us to
clojure.jar.
WARNING: You have not defined a path to clojure.jar so I can't compile files.
This will cause some parts of clojure.contrib not to work (e.g., pretty print).
To enable compiling, run "ant -Dclojure.jar=<...path to clojure.jar..>"
Locating namespaces to compile ...
Compiling Clojure namespaces ...