If you are using SBT, Maven or Gradle, add the following dependency to the dependencies section of your project descriptor to access the Vert.x Core API and enable the Scala support:

- SBT (in your `build.sbt` file):

    libraryDependencies += "io.vertx" %% "vertx-lang-scala" % "3.9.1"

- Maven (in your `pom.xml`):

    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-lang-scala_2.12</artifactId>
      <version>3.9.1</version>
    </dependency>

- Gradle (in your `build.gradle` file):

    compile "io.vertx:vertx-lang-scala_2.12:3.9.1"