Feature Expressions are coming to Clojure and ClojureScript. You will have to build your own patched versions, these are instructions on how to do that.
Follow these steps or just do sh try_feature_expressions.sh
Grab Clojure, ClojureScript and tools.reader
git clone git@github.com:clojure/clojure.git
git clone git@github.com:clojure/clojurescript.git
git clone git@github.com:clojure/tools.reader.git
Patch, build, install
cd clojure
git checkout 08bc5673
git apply ../clojure.diff
./antsetup.sh
mvn install
cd ../tools.reader
git checkout 7770bd4d
git apply ../tools.reader.diff
lein install
cd ../clojurescript
git checkout 11feca41
git apply ../clojurescript.diff
lein install
cd ..
These patches contain custom version numbers to differentiate them. These are the version vectors:
[org.clojure/clojure "1.7.0-fx"]
[org.clojure/clojurescript "0.0-9999"]
[org.clojure/tools.reader "0.8.13-fx"](adding -fx to the clojurescript version doesn't work, cljsbuild.compat/parse-version will choke on it)
Now use the versions above in your project.clj, and add a cljc directory to your :source-paths.
Have a look at the featex directory for an example app.
