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It should. But if you're still having trouble, I found using this will always work for me:

sudo ARCHFLAGS="-arch i386 -arch x86_64" CC=/usr/bin/gcc-4.2 pip install

Yeah, I think I finally found that tip after trying quite a number of things.

And hooray, lxml and PIL both appear to have installed successfully on Lion + Xcode 4.1.

With or without the ARCHFLAGS tip?

Both worked for me with a sudo pip install after downloading Xcode from the MAS.