Every time I try to import a project downloaded from googlecode into Eclipse but I get some errors:
The project was not built since its build
Initially I was trying to import an android project from github and encountered the above problem
cannot configure build path
unable to get system libraries
Package Explorer -> Right click the project -> “Properties” -> "Android" -> "Project Build Target" = 2.3.3
Note: Also try Clean (On Windows: Project -> Clean) then Refresh (F5) at random. There's a good chance this will magically solve all your problems.
courtesy: KYLE CLEGG
reference link