for (set in sourceSets) {
    def taskName = "source${set.name.capitalize()}Kotlin"
    def dir = new File(project.getBuildDir(), "sources/${set.name}/kotlin")
    task(taskName, type: TaskSourceCopy) {
        source = set.getKotlin()
        output = dir
    }
    def compileTask = tasks[set.getCompileTaskName("kotlin")]
    compileTask.source = dir
    compileTask.dependsOn taskName
    def dirPath = dir.toPath()
    compileKotlin.include {
        return it.file.toPath().startsWith(dirPath)
    }
}