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* Both Firefox and OpenOffice.org run on Windows, Linux, and Mac. You can, and should, get experience building on all 3 platforms, but begin with one and do more if you have time.
* If you've never built either before, build Mozilla Firefox trunk (i.e., 3.0.1). If you have built Firefox in the past, build OpenOffice.org trunk (3.x) for a new experience.
* Follow the instructions for creating a build environment, obtaining the source, configuring, and building: