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→Building Firefox
http://www.microsoft.com/express/download/
If you paid for the Professional version of Visual Studio you can skip this step. But if you are using an express version, you need to install the Windows Server 2003 Platform SDK in order to get some headers (atlbase.h to be specific) included in the Professional version:
http://www.microsoft.com/downloads/details.aspx?FamilyId=0BAF2B35-C656-4969-ACE8-E4C0C0716ADB&displaylang=en
''(The example above is for Visual C++ 2008 Express. The name of the bat file you use should match the directory that Visual Studio is installed in. For instance, VS2005 uses start-msvc8.bat)''
''Special note: You might get an error saying you are targeting the wrong SDK. Try deleting your obj-ff directory if you have one.''
=== Linux ===
You should have [http://developer.apple.com/TOOLS/Xcode/ Xcode] installed. You don't need to use Xcode for editing source files, but you will need the developer SDK that comes with it.
In order to build Firefox you will need something called MacPorts which can be dowloaded downloaded from here:
http://www.macports.org/install.php