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1. Install Apache Flex 4.9 or later as an SDK in FB.
2. Shut down FB
3. Install Google Closure library. You can get a zip from: http://code.google.com/p/closure-library/downloads/list
4. Set the environment variable GOOG_HOME to point to the folder that contains the closure and third_party folders. This folder's name and location may be different in different version of Google Closure.
5. Unzip ApacheFlexJS.zip (win) or ApacheFlexJS.tar.gz (mac) from httphttps://peoplebuilds.apache.org/~aharui/FlexJS/job/flex-asjs/lastSuccessfulBuild/artifact/out/ into an empty folder. (Note that this is a "nightly-build" and not an official Apache release).
6. Change to that folder and run deploy.sh or deploy.bat <path to Apache Flex SDK folder>
   Note that the deploy script will copy the AIR and FlashPlayer SDKs from the Apache Flex SDK folder and create a few other files and folders required to make Flash Builder recognize that folder as a Flex SDK.
7. Run Flash Builder
8. In the Flash Builder Preferences menu add this new folder as a Flex SDK.
9. Choose from the File menu, Import, Run/Debug, Launch Configurations
10. Choose the ide/flashbuilder folder from this modified copy of the Apache Flex SDK.
    There should now be several new configs in the Run menu under External Tools

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