Comment 2 for bug 941039

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L Olson (l-olson) wrote :

macports does not support XCode 4.3. They suggest using Xcode 4.2 (or 4.1) on Lion:
http://www.macports.org/install.php

That could be the issue.

I did see a possible fix here in the comments:
http://mandogmachine.com/2012/02/xcode-4-3-breaks-macports/

sudo xcode-select -switch /Applications/Xcode.app
sudo ln -s /usr/bin/clang /Applications/Xcode.app/Contents/Developer/usr/bin/clang
sudo ln -s /usr/bin/clang++ /Applications/Xcode.app/Contents/Developer/usr/bin/clang++

But I haven't tried it.