How to not build Android project in workspace?

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http://stackoverflow.com – I'm using Eclipse for Android development. Lets say I have a project A that uses code from project B. In project A: I setup a link to a sourcefolder to code i project B. The linked code will build, but some other code in B has errors. Can I have project B included i my workspace but exclude it from the auto-build-process? Thanks! (HowTos)