You need to use `ns-resolve' to resolve the actual vars you want to use.
Here's a snippet from one of our projects which shows the approach:

```clojure
(defn ws-repl []
  (require 'cemerick.piggieback
           'weasel.repl.websocket)
  (let [cljs-repl (ns-resolve 'cemerick.piggieback 'cljs-repl)
        repl-env (ns-resolve 'weasel.repl.websocket 'repl-env)]
    (cljs-repl
     :repl-env (repl-env
                :ip "0.0.0.0"
                :port 9009
                :working-dir "resources/public/out"))))
```

Jonathon McKitrick <jmckitr...@gmail.com> writes:

> I'm using environ and lein-environ to pick up dev settings, such as 
> enabling weasel/piggieback in development.
>
> In my server module, I'm running this code in -main:
>
> (when (env :dev?)
>       (println "DEV")
>       (require 'pts.dev)
>       (pts.dev/browser-repl))
>
> But pts.dev still throws a class not found exception.  However, after the 
> project has loaded and begins execution, I'm able to run that snippet 
> successfully.
>
> What's the trick to getting pts.dev into the namespace conditionally?
>
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