Finally, I have build android source code successfully.
Here is how I did it :
In first attempt, I had downloaded source code of Kitkat branch. But it was not downloaded properly.(source files were missing).
Then, I have downloaded Android OS source code of master branch, which is downloaded properly.
Then I build it.
It took 5 hours to build it.
At the end, my terminal shows following lines :
#### make completed successfully (04:40:46 (hh:mm:ss)) ####
I refer this link :
https://source.android.com/source/building.html[
^] for source code download and build.