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Compile once for i386 and x86_64

Hi, I am using libraw in one of my projects on Mac OS X.
I want to build my mac app in Xcode with architecture set to "Stand(32/64-bit Intel)", so that I need to compile libraw that can be linked in both 32 and 64 bits environment. But at this moment, I can compile either i386 version or x86_64 version, i can not make it compile once for both architectures.
Can anyone help me? Many thanks!

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