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OS X on PowerPC or ARM (iPhone) requires a preprocessor from
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@url{git://git.libav.org/gas-preprocessor.git} to build the optimized
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in your PATH, Libav's configure will pick it up automatically.
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OS X on AMD64 and x86 requires @command{yasm} to build most of the
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@url{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix}
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or @url{http://www.macports.org, MacPorts} can easily provide it.