Libraries written in Kotlin are factored out into a separate project

libraries/kunit/module.kt

@@ -0,0 +1,10 @@
+import kotlin.modules.*
+
+fun project() {
+    module("kunit") {
+        // TODO how to refer to the dir of the module?
+        classpath += "kunit/lib/junit-4.9.jar"
+
+        addSourceFiles("src/main/kotlin")
+    }
+}