Eclipse indexing not working

Question

I am using CDT in Eclipse 3.5.2 Galileo in Ubuntu.

My eclipse\'s indexer doesn\'t work at times. By that I mean when I ctrl click a function it says

Answer 1

1. Right click on the project.
2. Select New->Convert to a C++ Project. Select your configuration. And then Next
3. Indexer will start indexing all the files.