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→Building Fennec
Before doing anything else, it's a good idea to [https://mozilla-version-control-tools.readthedocs.org/en/latest/hgmozilla/index.html install and configure Mercurial as described here]. Mercurial is a very powerful (but oft-misunderstood) version control tool, but it has painful defaults.
==== Alternative: Run the setup script directly ====
Run either of the following in a terminal. If you have curl installed (note that Mac OS X ships curl by default):
