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Gradle is the primary build tool for building OpenJFX. Since the repository includes a Gradle wrapper that will download the correct Gradle version when needed, you do not need to manually install Gradle. We currently use Gradle 45.83 for jfx-dev (IMPORTANT: Only this version is regularly tested). If you want to generate a wrapper yourself (for example, you want to build OpenJFX with a different Gradle version), then you will need to install Gradle.
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