For the repository which got '189' Stars, how many solutions which needs to be compiled does it contain?
repository refers to Repository.Id; solution needs to be compiled refers to WasCompiled = 0;
SELECT COUNT(T2.RepoId) FROM Repo AS T1 INNER JOIN Solution AS T2 ON T1.Id = T2.RepoId WHERE T1.Stars = 189 AND T2.WasCompiled = 0