Xcode 4.3 and broken utilities
If you install Xcode 4.3 and remove 4.2 from your system you might be in for a surprise. Xcode 4.3 doesn’t play nice yet, and some utilities will not work since some are still looking in the old /Developer location.
Here’s a fix I’ve found for Xcode 4.3 when you encounter problems with utilities or libraries not being found.
If you create the following symbolic links you should be good to go…
sudo ln -s /Applications/Xcode.app/Contents/Developer /
sudo ln -s /Applications/Xcode.app/Contents/OtherFrameworks/DevToolsFoundation.framework /Developer/Library/PrivateFrameworks
Note: This assumes that you’ve nuked the 4.2 installation after installing 4.3.