XCode 4.3 Not Finding Include File

If you run into the case where XCode 4.3 can't find an include file, what has worked for me is to remove the relevant folder from the project (but don't delete the folder/file on the file system), and then add the folder back, choosing to add folders as groups.

Sometimes I will add a folder - such as from a 3rd party library - and the resulting folder in XCode will be displayed as blue, and none of the files can be found when I try to include them.

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