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02/25/2018, 11:51 AMAs of Kotlin 1.2, multiplatform projects have to be built with Gradle; other build systems are not supported.
To create a new multiplatform project in the IDE, select the "Kotlin (Multiplatform)" option under "Kotlin" in the New Project dialog. This will create a project with three modules, a common one and two platform ones for JVM and JS.