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Prerequisites
In order to build OpenJFX, it is necessary to have all of the tools needed on the system you are building with.
Java SE 8
Since each release of OpenJFX is paired with a corresponding release of the JDK, you should make sure that you have a recent (preferably the latest) promoted build of the JDK available. For Java SE 8, these can be downloaded from the JDK 8 java.net page. Some make it a practice to always run against the latest promoted build, others will stick with an older build until they finally can't build OpenJFX with it anymore, and then update. Whichever method you chose, you need to have a reasonably recent version of JDK 8 installed.
The OpenJFX build requires a Java JDK 8 that does not have the JFX jar present. The build scripts check for this condition, and will refuse to continue if it is found.This jar is found in the JDK at (your JDK)/jre/lib/ext/jfrt.jar. A common practice is to have a copy the JDK for general use, and another for building, and then remembering to set you PATH when building to the proper JDK. There are many ways to copy the JDK, and which one to use can depend on which OS you are using.
Mercurial
OpenJFX, as with OpenJDK, uses Mercurial as the source control system. You must install some support for using Mercurial. Many (if not all) IDEs include built in support, although the tooling is generally not as good as you might get from a standalone tool. Popular options include SourceTree from Atlassian, TortoiseHg for Windows, or the command line tools from Mercurial.
Gradle
You must also install Gradle. We are using Gradle v1.8 (IMPORTANT: Only Gradle 1.8 is guaranteed to work).
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