[Cmake] compile Hello example of CMake

[Lijun Ding]

> With a simple attempt, I have not been able to duplicate your problem.
Thank you very much. I updated my .tcshrc,  and now the problem dispeared.
I am a newcomer of the lab, and I guess the .tcshrc wasn't setup correctly
when I was given an account.

When using "make" after "ccmake", the following warning appears:
   make: warning:  Clock skew detected.  Your build may be incomplete.
Do you know how to stop it? Thanks a lot.

Lijun