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OS X Lion Notes
Command Line Tools
The XCode 4.3 installer does not install command line tools by default, but they can be installed after the main XCode package has been installed. See New Features in Xcode 4.3 for more details and instructions.
Possible CMake Issues
The following warning may be seen while trying to configure a CMake project on OS X Lion:
xcode-select: Error: No Xcode folder is set. Run xcode-select -switch <xcode_folder_path> to set the path to the Xcode folder.
To fix, the following should work:
sudo /usr/bin/xcode-select -switch /Applications/Xcode.app/Contents/Developer/