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How to add internal RTC API to build path in RTC eclipse

My purpose is to get allocation percentage of user to project areas using RTC Client Java API. I was going through these links to get an idea on how to do it -
2 answers

As far as I know the Plain Java Client Libraries and the RTC Client and Server SDK ship both internal API.
All the stuff that is not mentioned in the Plain Java Client Libraries JavaDoc is considered internal API. All that has internal in the namepath (package) is internal API. It is necessary to look at the package names to tell where the stuff belongs to.
In addition to all this the RTC Eclipse client ships packages not included in the SDKs and the Plain Java. these have typically rcp (rich client platform) in the package path name.