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Step 2: Install [http://developer.mozilla.org/en/docs/Windows_Build_Prerequisites#GNU_Tools_for_Microsoft_Windows_.28Cygwin.29
GNU Tools for Microsoft Windows (Cygwin)]
. Cywin is a Linux-like environment for Windows. It includes many utilities that are used to build firefox, such as gawk, perl, zip, and make. When selecting packages, you must make sure the version of make is 3.80.
