I have a work space with many projects. One of them is suddenly missing the Google APIs libraries even though it is clearly checked. the properties file lists it correctly.
How do I get Eclipse to add these to this one project?

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once i had problem like this : i tried many but can’t find and positive solution.
(1)
– make new project with required target and move src, res, ref and manifest to this new project.
(2)
– Just try remove auto build option from project menu and then delete gen folder and just build project and then clean & build project.