Several different packages under /gen folder in Eclipse

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http://stackoverflow.com – I'm trying to import an Android project under Eclipse. The project uses the Facebook SDK, the MoPub SDK, and the Pull To Refresh library, among others. The three I named have their source and such pulled under the /libs directory. The workspace also has them as separate projects. Now, under /gen in my main project, I have 4 different packages; one for each of these libraries and one for the main project. Is this normal? I also get several "R cannot be resolved to a variable" errors, but oddly enough I don't get them every time I use R. (HowTos)