R.java file doesn't contain ids for res/raw/<audio files> in Git code

Question

I have placed some audio files in res/raw folder. In eclipse its creating the R.java file correctly and everything works fine. But after committing the code in Git and creating the iso image, the generated R.java file doesn't have id created for files in raw directory and it gives compilation error wherever I'm referring to those resources. The res directory has beed added during current Git commit, the other directories were already existing in Git code.

Any clue on why R.raw ids are not getting created will be helpful.

Thanks in advance.